Relevant bibliographies by topics / BiFeO3

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Academic literature on the topic 'BiFeO3'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "BiFeO3"

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William, R. V., A. Marikani, and K. Gangatharan. "Investigation of Multiferroic BiFeO3 Nanorods Using 2-MOE(C3H8O2)-Assisted Citrate Sol–Gel Method." International Journal of Nanoscience 18, no. 05 (July 24, 2019): 1850029. http://dx.doi.org/10.1142/s0219581x18500291.

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Bismuth ferrite (BiFeO[Formula: see text] nanorods have been prepared from 2-methoyethanol (2-MOE)-assisted sol–gel technique. Structure, dielectric, and magnetic properties of BiFeO3 nanorods are briefly discussed in this paper. Fourier-transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) results suggest that the BiFeO3 peaks calcined at 500∘C exhibit a distorted rhombohedral perovskite structure with the absence of other secondary phases like Bi2Fe4O9. Meanwhile, the BiFeO3 showed excellent photoluminescence (PL) behavior due to the transmission of electrons from conduction band to the valence band. Ferroelectric hysteresis loop of BiFeO3 shows an increase of coercivity from 5.5–6[Formula: see text][Formula: see text]C/cm2 in a frequency range of 6–12[Formula: see text]kHz. The magnetization measurement resulted in a well-saturated ferromagnetic behavior, and in addition, the temperature-dependent magnetization was discussed for BiFeO3 nanorod using superconducting quantum interference device (SQUID) method. The zero-field-cooled (ZFC) and field-cooled (FC) curves reveal spin-glass effect owing to size effects, spin exchange, and anisotropy of material assembly.
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Salak, Andrei N., João Pedro V. Cardoso, Joaquim M. Vieira, Vladimir V. Shvartsman, Dmitry D. Khalyavin, Elena L. Fertman, Alexey V. Fedorchenko, et al. "Magnetic Behaviour of Perovskite Compositions Derived from BiFeO3." Magnetochemistry 7, no. 11 (November 16, 2021): 151. http://dx.doi.org/10.3390/magnetochemistry7110151.

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The phase content and sequence, the crystal structure, and the magnetic properties of perovskite solid solutions of the (1−y)BiFeO3–yBiZn0.5Ti0.5O3 series (0.05 ≤ y ≤ 0.90) synthesized under high pressure have been studied. Two perovskite phases, namely the rhombohedral R3c and the tetragonal P4mm, which correspond to the structural types of the end members, BiFeO3 and BiZn0.5Ti0.5O3, respectively, were revealed in the as-synthesized samples. The rhombohedral and the tetragonal phases were found to coexist in the compositional range of 0.30 ≤ y ≤ 0.90. Magnetic properties of the BiFe1−y[Zn0.5Ti0.5]yO3 ceramics with y < 0.30 were measured as a function of temperature. The obtained compositional variations of the normalized unit-cell volume and the Néel temperature of the BiFe1−y[Zn0.5Ti0.5]yO3 perovskites in the range of their rhombohedral phase were compared with the respective dependences for the BiFe1−yB3+yO3 perovskites (where B3+ = Ga, Co, Mn, Cr, and Sc). The role of the high-pressure synthesis in the formation of the antiferromagnetic states different from the modulated cycloidal one characteristic of the parent BiFeO3 is discussed.
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Dai, J. F., T. Xian, L. J. Di, and H. Yang. "Preparation ofBiFeO3-Graphene Nanocomposites and Their Enhanced Photocatalytic Activities." Journal of Nanomaterials 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/642897.

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BiFeO3nanoparticles were prepared via a polyacrylamide gel route. BiFeO3-graphene nanocomposites were fabricated by mixing BiFeO3nanoparticles and graphene into absolute ethanol solution followed by thermal drying. The TEM observation demonstrates that the BiFeO3nanoparticles are well anchored onto graphene sheets. The photocatalytic activities of the as-prepared samples were evaluated by the degradation of methyl orange (MO) under simulated sunlight irradiation. Compared to bare BiFeO3nanoparticles, BiFeO3-graphene nanocomposites exhibit enhanced photocatalytic activity. The outstanding photocatalytic performance is mainly ascribed to the efficient transfer of photogenerated electrons from BiFeO3to graphene, thus leading to an increased availability of h+for the photocatalytic reaction. In addition, hydroxyl (·OH) radicals were detected by the photoluminescence technique using terephthalic acid as a probe molecule and are found to be produced on the irradiated BiFeO3and BiFeO3-graphene nanocomposites; in particular, an enhanced yield is observed for the latter.
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Pema, Tenzin, Ankit Kumar, Babita Tripathi, Soumya Pandit, Sunil Chauhan, Satyendra Singh, Pritam Kumar Dikshit, et al. "Investigating the Performance of Lithium-Doped Bismuth Ferrite [BiFe1−xLixO3]-Graphene Nanocomposites as Cathode Catalyst for the Improved Power Output in Microbial Fuel Cells." Catalysts 13, no. 3 (March 20, 2023): 618. http://dx.doi.org/10.3390/catal13030618.

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In this study, multifunctional lithium-doped bismuth ferrite [BiFe1−xLixO3]-graphene nanocomposites (x = 0.00, 0.02, 0.04, 0.06) were synthesized by a sol-gel and ultrasonication assisted chemical reduction method. X-ray diffraction and FESEM electron microscopy techniques disclosed the nanocomposite phase and nanocrystalline nature of [BiFe1−xLixO3]-graphene nanocomposites. The FESEM images and the EDX elemental mapping revealed the characteristic integration of BiFe1−xLixO3 nanoparticles (with an average size of 95 nm) onto the 2D graphene layers. The Raman spectra of the [BiFe1−xLixO3]-graphene nanocomposites evidenced the BiFe1−xLixO3 and graphene nanostructures in the synthesized nanocomposites. The photocatalytic performances of the synthesized nanocomposites were assessed for ciprofloxacin (CIP) photooxidation under UV-visible light illumination. The photocatalytic efficiencies of [BiFe1−xLixO3]-graphene nanocomposites were measured to be 42%, 47%, 43%, and 10%, for x = 0.00, 0.02, 0.04, 0.06, respectively, within 120 min illumination, whereas the pure BiFeO3 nanoparticles were 21.0%. BiFe1−xLixO3 nanoparticles blended with graphene were explored as cathode material and tested in a microbial fuel cell (MFC). The linear sweep voltammetry (LSV) analysis showed that the high surface area of BiFeO3 was attributed to efficient oxygen reduction reaction (ORR) activity. The increasing loading rates of (0.5–2.5 mg/cm2) [BiFe1−xLixO3]-graphene composite on the cathode surface showed increasing power output, with 2.5 and 2 mg/cm2 achieving the maximum volumetric power density of 8.2 W/m3 and 8.1 W/m3, respectively. The electrochemical impedance spectroscopy (EIS) analysis showed that among the different loading rates used in this study, BiFeO3, with a loading rate of 2.5 mg/cm2, showed the lowest charge transfer resistance (Rct). The study results showed the potential of [BiFe1−xLixO3]-graphene composite as a cost-effective alternative for field-scale MFC applications.
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Wu, Mei Mei, Lin Feng He, Guo Hai Wei, and Yu Qing Li. "Crystal Structure and Multiferroic Behaviors of Solid Solution (1-y)BiFe(1-x)MnxO3-yBaTiO3." Materials Science Forum 944 (January 2019): 526–30. http://dx.doi.org/10.4028/www.scientific.net/msf.944.526.

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It is expected that BiFeO3-based materials will have both ferroelectricity and ferromagnetism. (1-y)BiFe(1-x)MnxO3-yBaTiO3 system was prepared using solid state reaction method. The goal of this study is to uncover the impacts of Mn doping and BaTiO3 content on the crystal structure, magnetism and ferroelectric properties. By forming a solid solution with BaTiO3, stable perovskite BiFeO3 was achieved. The rhombohedrally distorted (1-y)BiFe(1-x)MnxO3-yBaTiO3 showed weak ferromagnetism due to the composition of BaTiO3 and the doping of Mn ion. 0.8BiFe0.9Mn0.1O3-0.2BaTiO3 and 0.7BiFe0.9Mn0.1O3-0.3BaTiO3 ceramics exhibited typical P-E hysteresis loops.
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Niu, Feng, Tong Gao, Laishun Qin, Zhi Chen, Qiaoli Huang, Ning Zhang, Sen Wang, Xingguo Sun, and Yuexiang Huang. "Polyvinyl Alcohol (PVA)-assisted Synthesis of BiFeO3 Nanoparticles for Photocatalytic Applications." Journal of New Materials for Electrochemical Systems 18, no. 2 (June 30, 2015): 069–73. http://dx.doi.org/10.14447/jnmes.v18i2.370.

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Bismuth ferrite (BiFeO3) is a promising material for visible light response photocatalytic applications. In the present work, BiFeO3 particles were synthesized by a polyvinyl alcohol (PVA)-assisted solid state reaction processing. The XRD pattern result indicated that the as-prepared particles are pure BiFeO3 crystalline phase. The microscopy observation demonstrated that the BiFeO3 particle size is from 100 to 200 nm, which is smaller than that of the BiFeO3 prepared without addition of PVA. The HRTEM showed that BiFeO3 particle is polycrystalline and contains many small crystal grains with different orientations. Furthermore, such nanosized and well-dispersed BiFeO3 particles exhibited a much higher photocatalytic activity than the prepared BiFeO3 without addition of PVA for the photodegradation of methyl orange contaminant under visible light irradiation.
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Di, Lijing, Hua Yang, Tao Xian, Xueqin Liu, and Xiujuan Chen. "Photocatalytic and Photo-Fenton Catalytic Degradation Activities of Z-Scheme Ag2S/BiFeO3 Heterojunction Composites under Visible-Light Irradiation." Nanomaterials 9, no. 3 (March 9, 2019): 399. http://dx.doi.org/10.3390/nano9030399.

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Z-scheme Ag2S/BiFeO3 heterojunction composites were successfully prepared through a precipitation method. The morphology and microstructure characterization demonstrate that Ag2S nanoparticles (30–50 nm) are well-decorated on the surfaces of polyhedral BiFeO3 particles (500–800 nm) to form Ag2S/BiFeO3 heterojunctions. The photocatalytic and photo-Fenton catalytic activities of the as-derived Ag2S/BiFeO3 heterojunction composites were evaluated by the degradation of methyl orange (MO) under visible-light irradiation. The photocatalytic result indicates that the Ag2S/BiFeO3 composites exhibit much improved photocatalytic activities when compared with bare Ag2S and BiFeO3. The optimum composite sample was observed to be 15% Ag2S/BiFeO3 with an Ag2S mass fraction of 15%. Furthermore, the addition of H2O2 can further enhance the dye degradation efficiency, which is due to the synergistic effects of photo- and Fenton catalysis. The results of photoelectrochemical and photoluminescence measurements suggest a greater separation of the photoexcited electron/hole pairs in the Ag2S/BiFeO3 composites. According to the active species trapping experiments, the photocatalytic and photo-Fenton catalytic mechanisms of the Ag2S/BiFeO3 composites were proposed and discussed.
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Sanga, Pascaline, Juanjuan Wang, Xin Li, Jia Chen, and Hongdeng Qiu. "Effective Removal of Sulfonamides Using Recyclable MXene-Decorated Bismuth Ferrite Nanocomposites Prepared via Hydrothermal Method." Molecules 28, no. 4 (February 5, 2023): 1541. http://dx.doi.org/10.3390/molecules28041541.

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Developing a simple and efficient method for removing organic micropollutants from aqueous systems is crucial. The present study describes the preparation and application, for the first time, of novel MXene-decorated bismuth ferrite nanocomposites (BiFeO3/MXene) for the removal of six sulfonamides including sulfadiazine (SDZ), sulfathiazole (STZ), sulfamerazine (SMZ), sulfamethazine (SMTZ), sulfamethoxazole (SMXZ) and sulfisoxazole (SXZ). The properties of BiFeO3/MXene are enhanced by the presence of BiFeO3 nanoparticles, which provide a large surface area to facilitate the removal of sulfonamides. More importantly, BiFeO3/MXene composites demonstrated remarkable sulfonamide adsorption capabilities compared to pristine MXene, which is due to the synergistic effect between BiFeO3 and MXene. The kinetics and isotherm models of sulfonamide adsorption on BiFeO3/MXene are consistent with a pseudo-second-order kinetics and Langmuir model. BiFeO3/MXene had appreciable reusability after five adsorption–desorption cycles. Furthermore, BiFeO3/MXene is stable and retains its original properties upon desorption. The present work provides an effective method for eliminating sulfonamides from water by exploiting the excellent texture properties of BiFeO3/MXene.
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Si, Yun-Hui, Yu Xia, Ya-Yun Li, Shao-Ke Shang, Xin-Bo Xiong, Xie-Rong Zeng, and Ji Zhou. "Enhanced visible-active photocatalytic behaviors observed in Mn-doped BiFeO3." Modern Physics Letters B 32, no. 17 (June 18, 2018): 1850185. http://dx.doi.org/10.1142/s0217984918501853.

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A series of BiFeO3 and BiFe[Formula: see text]Mn[Formula: see text]O3 (x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) were synthesized by a hydrothermal method. The samples were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy (EDS) and UV–Vis diffuse reflectance spectroscopy, and their photocatalytic activity was studied by photocatalytic degradation of methylene blue in aqueous solution under visible light irradiation. The band gap of BiFeO3 was significantly decreased from 2.26 eV to 1.90 eV with the doping of Mn. Furthermore, the 6% Mn-doped BiFeO3 photocatalyst exhibited the best activity with a degradation rate of 94% after irradiation for 100 min. The enhanced photocatalytic activity with Mn doping could be attributed to the enhanced optical absorption, increment of surface reactive sites and reduction of electron–hole recombination. Our results may be conducive to design more efficient photocatalysts responsive to visible light among narrow band gap semiconductors.
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Jiang, Yuanyuan, Rajesh Pathak, Tiansheng Zhang, Haibin Xu, Xiaoyi Li, Ronghua Jian, and Fan Wu. "Enhancement of Charge Transfer in TiO2/BiOI Heterojunction Using BiFeO3 as Interface Modifier for Photoelectrochemical Conversion." Journal of The Electrochemical Society 168, no. 11 (November 1, 2021): 116513. http://dx.doi.org/10.1149/1945-7111/ac393a.

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The solution-processed TiO2/BiFeO3/BiOI ternary heterojunction with cascade energy level alignments was developed for photoelectrochemical conversion, in which, BiOI was deposited on BiFeO3 sensitized TiO2 mesoporous film by spin-coating method. BiFeO3 as ferroelectric material was served here as a mediator for improvement of charge separation and transfer. The photocurrent generation in TiO2/BiFeO3/BiOI sample are very stable, even measured after 50 light on/off cycles with 2000 s. Moreover, compared with the TiO2/BiOI film, TiO2/BiFeO3/BiOI film showed about twice as high photocurrent density and photocatalytic activity. Kelvin probe force microscope showed that the surface potential of TiO2/BiFeO3/BiOI film was 0.456 V, which was obviously larger than 0.226 V in TiO2/BiOI sample. The increased surface potential should originate from the polarization electric-field E self by BiFeO3 interlayer, in which the direction of electric-field was directed toward the BiOI. The presence of E self consequently resulted in the better dissociation of photo-generated electrons and holes. Charge transport dynamics suggested that charge transfer rate increased from 6.813 s−1 of TiO2/BiOI heterojunction to 22.280 s−1 of TiO2/BiFeO3/BiOI heterojunction, and surface charge recombination rate reduced from 10.305 s−1 of the TiO2/BiOI to 7.707 s−1 of TiO2/BiFeO3/BiOI heterojunction, which results in the enhanced photoelectrochemical conversion in TiO2/BiFeO3/BiOI heterojunction.
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Dissertations / Theses on the topic "BiFeO3"

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Waterfield, Price Noah. "Domains and functionality in multiferroic BiFeO3 films." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:e8a8f8ff-8510-4fdf-93f4-0037cebc0210.

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For over half a century, the technological promise of spins manipulable by a small voltage has captivated the interest of experimental and theoretical researchers alike. However, if thin-film multiferroics are to be incorporated into future data storage devices, a much greater understanding of their behaviour and how they differ from their bulk counterparts is required. In this thesis, we probe the fundamental multiferroic properties of BiFeO3 films through a combination of state-of-the-art diffraction and microscopy techniques. We investigate the coupling between magnetic, ferroelectric, and structural order, with a focus on domains, and how the domain structure may be manipulated in order to tailor the multiferroic properties of the material. Using non-resonant magnetic x-ray scattering (NXMS) and neutron diffraction, we study the magnetic and structural properties of (111)pc-oriented BiFeO3 films. Contrary to the general belief that to they grow as a rhombohedral monodomain, we find that they comprise a sub-micron texture of monoclinic domains. The magnetic structure is found to be intimately coupled to the structure, resulting in the propagation vector being locked to the monoclinic b-axis. This magnetoelastic coupling opens up a route to strain-engineer the magnetic domains via epitaxial strain. By growing BiFeO3 films on a lower-symmetry, TbScO3 substrate, we are able to engineer a magnetic, structural and ferroelectric monodomain, coherent over the entire film, constituting an increase in the domain size by over five orders of magnitude. We directly demonstrate the coupling between ferroelectric and magnetic order parameters of the cycloidal magnetic structure. Using NXMS polarimetry to measure directly the magnetic polarity, we show that upon switching the ferroelectric polarisation, the magnetic polarity switches accordingly---a major rearrangement of the magnetic structure, with each spin rotating by 90 degrees on average. This goes counter to idea that magnetic and ferroelectric order parameters are only weakly coupled in type-I multiferroics. Finally, using photoemission electron microscopy we are able to directly image the sub-micron magnetostructural domain structure. We further show that there is a strong interfacial coupling between the magnetostructural domains of BiFeO3 with a ferromagnetic overlayer. The BiFeO3 domains are found to impose a uniaxial anisotropy in the overlayer, opening up a route to control ferromagnetic domains.
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Bai, Xiaofei. "Effet de taille et du dopage sur la structure, les transitions et les propriétés optiques de particules du multiferroïque BiFeO₃ pour des applications photocatalytiques." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC013/document.

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Ce travail de thèse expérimentale a été consacré à la synthèse par des méthodes de chimie par voie humide de nanoparticules à base du multiferroïque BiFeO3 et à leur caractérisation, avec comme objectif finale des applications photocatalytiques. Ce matériau présente une bande interdite, avec un gap de 2.6eV, qui permet la photo-génération de porteurs de charges dans le visible faisant ainsi de BiFeO3 un système intéressant pour des processus photo-induits. Ce travail s’est en particulier focalisé à caractériser les propriétés de nanoparticules à base de BiFeO3 en vue de comprendre l’effet de ses propriétés sur leur potentiel dans des applications liées à la photocatalyse. Tout d’abord, l’étude des effets de taille sur les propriétés structurales, de transitions de phase, et physico-chimiques des particules a été réalisée, en gardant comme principal objectif de découpler les propriétés liées à la surface de celles du massif/cœur de la particule. Pour cela, une maîtrise et une optimisation des procédés de synthèse de particules aux échelles nano- et micro-micrométriques de BiFeO3 a été nécessaire pour obtenir des composés de taille variable et de très bonne qualité cristalline. Malgré la diminution de la taille des particules, on constate que, grâce au contrôle de paramètres de synthèse, nos nanoparticules présentent des propriétés très proches à celles du massif de BiFeO3, gardant la structure rhomboédrique R3c avec des faibles effets de contrainte. Afin de contrôler indirectement par le dopage les propriétés optiques des composés à base de BiFeO3, on a réussi à réaliser un dopage très homogène en La3+, et un dopage partiel en Ca2+, sur le site de Bi3+. Les propriétés optiques des nanoparticules et leurs applications dans les premières expériences photocatalytiques sur la dégradation du colorant rhodamine B ont montré la complexité de la physico-chimie de leur surface et du processus d’interaction lumière-particule. Après analyse des données d’absorbance optique en fonction de la taille de nanoparticules, on observe que la bande interdite déduite pour ces différentes particules n’est pas le facteur prédominant sur les performances photocatalytiques. D’autres facteurs ont pu être identifiés comme étant à l’origine de la localisation de charges photo-générées, tels que des états de surface liés à une fine couche de peau ou skin layer sur les nanoparticules, présentant des défauts structuraux, une réduction de l’état d’oxydation du Fe3+ vers le Fe2+ et la stabilisation d’autres adsorbats, tels que FeOOH ; tous ces facteurs peuvent contribuer au changement dans les performances photocatalytiques. Les résultats photocatalytiques restent très encourageants pour poursuivre les études de nanoparticules à base de BiFeO3, montrant une dégradation de la rhodamine B à 50% au bout de 4h de réaction photocatalytique pour certaines des nanoparticules étudiées
This experimental PhD work has been dedicated to the synthesis, by wet chemistry methods, and characterization of nanoparticles based on multiferroic BiFeO3, with the aim of using them for photocatalytic applications. This material presents a bandgap of 2.6eV, which allows the charge carrier photoexcitation in the visible range, making BiFeO3 a very interesting system for photoinduced processes. This thesis has been particularly focused on characterizing the properties of BiFeO3 nanoparticles in view of understanding the relationship of their properties on their potential use for photocatalytic applications. First of all, the topic of the size effect on the structural properties, phase transitions, and physics and chemistry of the particles has been developed, keeping as first aim to separate the properties related to the surface from those arising from the bulk/core of the particle. To do so, the mastering and optimization of the synthesis processes of BiFeO3 particles at the nano and microscale were needed, to finally obtain different size compounds with high crystalline quality. Despite the size reduction of the particles, we notice that, thanks to the control of the synthesis process, our BiFeO3 nanoparticles present properties very close to those of the bulk BiFeO3 material, keeping the rhombohedral structure R3c with weak strain effects. In order to indirectly tune the optical properties exploiting the doping, we have succeeded in realizing a homogenous La3+ doping, and a partial Ca2+ doping, on the Bi3+ site. The optical properties of the nanoparticles and their use on the first photocatalytic experiments for degrading rhodamine B dye have shown the complexity of the physics and chemistry phenomena at their surface and of the light-particle processes. After analyzing optical absorbance data as a function of the particle size, we observe that the deduced bandgap for different particles is not the main parameter directing the photocatalytic performances. Other factors have been identified to be at the origin of the localization of the photoexcited charges, as the surface states linked to the skin layer of the nanoparticles, depicting structural defects, a reduction of the oxidation state of Fe3+ towards Fe2+ and the stabilization of other adsorbates, such as FeOOH; all these parameters may contribute to the change on the photocatalytic performances. The photocatalytic results are very encouraging, motivating to continue the study of BiFeO3 based nanoparticles, though depicting a 50% rhodamine B degradation after 4h of photocatalytic reaction using some of the present nanoparticles
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Karimi, Sarah. "Structure-property relations in rare earth doped BiFeO3." Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/12876/.

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RE-doped BiFe03 (RE = La, Nd, Srn, Gd) compositions have been produced and investigated with a view to establishing a broad overview of their crystal chemistry and domain structure. For less than 10% RE dopant, the perovskite phase in all compositions could be indexed according to the rhombohedral, R3c cell of BiFe03. For La, Nd and Srn doped compositions with more than 15% dopant, a new antipolar phase was stabilised similar in structure to PbZr03 Pbam symmetry with a -V2ao2-V2ac,4ac unit cell where a, is the psuedocubic unit cell. The orthoferrite, Pnma structure was present in all RE-doped BiFe03 compounds with higher dopant concentration. The compositional window over which the PbZrO3-like phase was stable increased with increasing end-member tolerance factor, t (effectively controlled by the RE ionic radius). On heating, the PbZrO3-like phase transformed to the orthoferrite, Pnma structure. Tc for all compositions decreased with decreasing A-site, average ionic polarizabilty and end member tolerance factor. For compositions with R3c symmetry, superstructure and orientational and translational (anti-phase) domains were observed in a manner typical of an anti-phase tilted, ferroelectric perovskite. For the new PbZrO3-like phase orientational domains were observed along with antiphase boundaries associated with quadrupling of the unit cell due to the antipolar displacements of the Bi/RE-ions Neutron powder diffraction was used to determine changes in the nuclear and magnetic structures across the phase transitions that relate the high-temperature non- polar (Pnma) to the low temperature polar (R3c) and anti-polar (Pbam) structures, respectively. The high-temperature Pnma phase has a -√2ac, --√2ac,2ac cell with an aa c + octahedral tilting. The low-temperature polar R3c structure is similar to the B-phase of pure BiFe03 and is rhombohedral with aaa octahedral rotations and cation displacements along the peudocubic [111] direction. Although electron diffraction revealed weak additional doubling along c (denoted by the appearance of ¼ {001} in addition to ~{11O} reflections) of the PbZr03 cell, Neutron and X-ray diffraction could not reliably refine a larger cell. This is attributed to the weak intensity of the 1/4 {OO I} reflections and the short coherence length of the 4ac modulation in the c- direction. The transitions from the high temperature Pnma phase to both low temperature phases are accompanied by a large discontinuous expansion of the lattice volume in the low- temperature structure. The Pnma to R3c transition occurs in the paramagnetic state and generates no detectable changes in the magnetic structure. In contrast, the Pnma to Pbam transition, which occurs in the magnetic state, is accompanied by abrupt 90 ° reorientation of the magnetic dipoles. Coupling between the nuclear and magnetic structures is manifested in a significant magnetization anomaly. The dielectric properties were studied as a function of temperature but no anomalies were recorded that were coincident with the structural phase transitions observed by differential scanning calorimetry. The absence of peaks in permittivity at T c was attributed to high conductivity with space charge polarisation dominating the dielectric response.
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4

González, Vázquez Otto E. "First-principles investigation of BiFeO3 and related multiferroic materials." Doctoral thesis, Universitat Autònoma de Barcelona, 2012. http://hdl.handle.net/10803/96248.

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Esta tesis trata sobre los magnetoel ectricos multiferroicos, una clase relativamente nueva de materiales descubiertos a mediados del siglo pasado, que presentan simultaneamente ferroelectricidad y magnetismo. El BiFeO3 (BFO) es un oxido con estructura perovskita, el cual es uno de los pocos materiales multiferroicos a temperatura ambiente. Sin embargo, como sus temperaturas de ordenamiento ferroel ectrico y anti-ferromagn etico son relativamente altas (alrededor de 1100 K y 640 K, respectivamente), las respuestas electromec anica y magnetoel ectrica del BFO son relativamente peque~nas en condiciones ambientales. En esta tesis se utilizamos m etodos ab-initio, basados en la teor a del funcional de la densidad (DFT), para estudiar las propiedades del BFO, y proponemos una posible estrategia para la mejora de su respuesta. Hemos utilizado m etodos de primeros principios para llevar a cabo una b usqueda sistem atica de las fases potencialmente estables de este compuesto. En la que consideramos las distorsiones m as comunes entre los oxidos de tipo perovskita y encontrando un gran n umero de m nimos locales de la energ a. En este trabajo se discute la gran variedad de estructuras de baja simetr a descubiertas, as como las implicaciones de estos hallazgos en cuanto a los trabajos experimentales mas recientes sobre este compuesto. Tambi en se llev o acabo un estudio de la soluci on s olida Bi1􀀀��xLax FeO3 (BLFO) formada por la BFO y la LaFeO3 (LFO)antiferromagnetica parael ectrica. Se discuten las transformaciones estructurales que sufre BLFO en funci on del contenido de La, y la conexi on de nuestros resultados con los estudios cristalogr a cos existentes. Hemos encontrado que, en una amplia gama de composiciones intermedias, la BLFO presenta fases que son esencialmente degeneradas en energ a. Adem as, los resultados sugieren que para este compuesto, dentro de esta regi on morfotr opica inusual, se puede utilizar un campo el ectrico para inducir transiciones parael ectrico a ferroel ectrico. Tambi en se discuten las propiedades de respuesta de la BLFO y se demuestra que se pueden mejorar signi cativamente en los materiales puros BFO y LFO, mediante la sustituci on parcial de los atomos Bi y La . Por otra parte, se presenta tambi en un estudio de primeros principios de la BFO a altas presiones. En el cual explicamos la naturaleza de las transiciones de fase del BFO, que simult aneamente involucran un colapso del volumen, un cambio en el estado de spin de High spin a Low spin y una metalizaci on producto del desorden magn etico en la nueva fase. Por ultimo presentamos los resultados preliminares de un proyecto en marcha, en el cual estamos modelando la energ etica de las rotaciones de los octaedros de oxigeno en los oxidos de estructura perovskita. Para ello se ha expandido la energ a en funci on de los par ametros de orden que caracterizan dichas rotaciones hasta cuarto orden. Hemos teado el modelo a los resultados de nuestros c alculos de primeros principios y realizado una comprobaci on cuidadosa de su valides, determinando que es necesario recurrir a ordenes mas altos en nuestra teor a.
This work is about magnetoeltric multiferroics, a relatively new class of ma- terials discovered by the mid of the past century, which involve simultaneously ferroelectricity and magnetism. Perovskite oxide BiFeO3 (BFO) is one of the few multiferroic materials at room temperature. However, as its ferroelectric and anti- ferromagnetic transition temperatures are relatively high (about 1100 K and 640 K, respectively), BFO's electromechanical and magnetoelectric responses are small at ambient conditions. In this thesis we used ab-initio methods, based on density functional theory, to study the basic properties of BFO and proposed possible strategies for enhancing its response. We used rst-principles methods to perform a systematic search for potentially stable phases of BFO. We considered the distortions that are most common among perovskite oxides and found a large number of local minima of the energy. We discussed the variety of low-symmetry structures discovered, as well as the implications of these ndings as regards current experimental work on this compound. We also carried out a study of the Bi1􀀀�xLaxFeO3 (BLFO) solid solution formed by multiferroic BFO and the paraelectric antiferromagnet LaFeO3 (LFO). We dis- cussed the structural transformations that BLFO undergoes as a function of La content and the connection of our results with the existing crystallographic stud- ies. We found that, in a wide range of intermediate compositions, BLFO presents competitive phases that are essentially degenerate in energy. Further, our results suggested that, within this unusual morphotropic region, an electric eld might be used to induce various types of paraelectric-to-ferroelectric transitions in the compound. We also discussed BLFO's response properties and showed that they can be signi cantly enhanced by partial substitution of Bi/La atoms in the pure BFO and LFO materials. We analyzed the atomistic mechanisms responsible for such improved properties and showed that the e ects can be captured by simple phenomenological models that treat explicitly the composition x in a Landau-like potential. Furthermore, we performed a rst-principles study of BFO at high pressures. Our work revealed the main structural change in Bi's coordination and suppression of the ferroelectric distortion, electronic spin crossover and metallization, and mag- netic loss of order e ects favored by compression and how they are connected. Our results are consistent with and explain the striking manifold transitions observed experimentally We conclude our thesis presenting the preliminary results of an ongoing project in which we are modeling the energetics of the oxygen octahedra rotations in per- ovskite oxides. The model is tted to the rst-principles results and a careful check of its validity is carried out.
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Turner, Stuart Lee. "The structure of bismuth ferrite - lead titanate (BiFeO3 - PbTiO3)." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507885.

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Murakami, Shunsuke. "BaTiO3-BiFeO3 based lead-free ceramics for actuator applications." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/21972/.

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A crystallochemical framework is proposed based on electronegativity difference (en) and tolerance factor (t) for BiMeO3 dopants to optimise the piezoelectric and electrostrictive response in BaTiO3-BiFeO3 based ceramics. Compositions in the series 0.05Bi(Me)O3-0.25BaTiO3-0.70BiFeO3 (BMe-BT-BF, Me: Y, Sc1/2Y1/2, Mg2/3Nb1/3, Sc, Zn2/3Nb1/3, Zn1/2Ti1/2, Ga, and Al) were fabricated using solid state synthesis. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) revealed that only Bi(Mg2/3Nb1/3)O3 and BiScO3 dopants, which lie in a narrow range of en vs. t, form homogeneous ceramics, free from secondary phases reflected in their superior piezoelectric coefficients (d33 ~ 145 pC/N). The promising initial properties of Bi(Mg2/3Nb1/3)O3 and BiScO3 doped compositions prompted further studies on 0.05Bi(Mg2/3Nb1/3)O3-(0.95-x)BaTiO3-(x)BiFeO3 (BMN-BT-BF, x = 0.55, 0.60, 0.63, 0.65, 0.70, and 0.75) and 0.05BiScO3-(0.95-x)BaTiO3-(x)BiFeO3 (BS-BT-BF, x = 0.55, 0.60, 0.625, 0.65, and 0.70) ceramics. For Me = Mg2/3Nb1/3, SEM revealed a homogeneous microstructure for x< 0.75. XRD suggested a gradual structural transition from pseudocubic to rhombohedral for 0.63
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Masteghin, João Francisco Vieira. "Síntese e propriedades de filmes finos multiferróicos de BiFeO3." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/153560.

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Foram preparados filmes finos, de Ferrita de Bismuto (BiFeO3), considerado um dos principais multiferróico que são classes de materiais que apresentam ferroeletricidade e ferromagnetismo simultaneamente. Os filmes foram preparados por um rota química chamada de Sol-gel modificado, variando-se a quantidade de % de mol do Bismuto, depositados em substratos de platina Pt/TiO2/SiO2/Si(100), variando-se a temperatura de cristalização entre 400°C a 600°C, com o objetivo de eliminar algumas fases indesejadas encontradas na literatura. Alguns filmes finos passaram pelo tratamento térmico em atmosférica de O2, com o intuito de diminuir a condutividade, causada pelas vacâncias de oxigênio no material. Pelos resultados obtidos foi possível conseguir filmes finos sem as fases indesejadas e com condutividade não tão alta, sendo possível realizar análises elétricas. Assim, tornou-se possível analisar o comportamento da permissividade, impedância e condutividade em função do campo aplicado e da temperatura. Com tais resultados mostra-se a indicação de polarização iônica nestes filmes. Eles apresentam uma energia de ativação parecida com filme finos encontrados na literatura. Além disso, também mostra que o comportamento das propriedades físicas são os mesmos quando varia a temperatura e o campo.
Bismuth Ferrite (BiFeO3) thin films were prepared, considered one of the main multiferroic that are classes of materials that present ferroelectricity and ferromagnetism simultaneously. The films were prepared by a chemical path called modified sol-gel, varying the amount of Bismuth mol percentage, deposited on Pt/TiO2/SiO2/Si(100) platinum substrates, varying the crystallization temperature between 400 °C to 600 °C, with the aim of eliminating some unwanted phases found in literature. Some thin films underwent the thermal treatment in atmospheric O2, in order to reduce the conductivity, caused by the oxygen vacancies in the material. By the results obtained, it was possible to obtain thin films without the undesired phases and with not so high conductivity, being possible to perform electrical analysis. This way it was possible to analyze the behavior of the permissiveness, impedance and conductivity in function of the applied field and temperature. With these results, it is shown an indication of ionic polarization in these films. They have an activation energy similar to thin films found in literature. It is also shown that the behavior of the physical properties are the same when temperature and the field change.
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8

Agbelele, Arsène. "Structure magnétique de couches minces épitaxiées du multiferroïque BiFeO3." Rouen, 2015. http://www.theses.fr/2015ROUES039.

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Ce travail porte sur l’étude de l’effet des contraintes d’épitaxie sur la structure magnétique de couches minces du multiferroïque BiFeO3 (BFO). Des films minces de BFO ont été déposés par ablation laser pulsée sur plusieurs substrats d’oxyde possédant des paramètres de mailles différents permettant de balayer une large gamme de désaccord paramétrique allant des contraintes de compression (ε= -1,7%) aux contraintes de tension (ε= +1%). L’étude par spectrométrie Mössbauer et diffusion nucléaire résonante du 57Fe à température ambiante a montré que l’ordre antiferromagnétique dans les couches minces évolue en fonction des contraintes d’épitaxie. La modulation cycloïdale des moments magnétiques de Fe3+ du BFO massif subsiste dans les couches minces soumises à une faible contrainte de compression, avec une direction de propagation du type [1-10]. De fortes contraintes d’épitaxie déstabilisent la cycloïde vers un ordre antiferromagnétique colinéaire avec une orientation préférentielle des moments magnétiques dépendant du type de contrainte. Dans le cas d’une faible contrainte de tension, une nouvelle direction de propagation de la cycloïde selon [110], inédite dans le massif, est mise en évidence. Les différentes structures magnétiques sont stables à basse température et la température de Néel de ces films ne dépend que faiblement des contraintes d’épitaxie. L’application d’un champ magnétique selon la normale au plan des couches permet de déstabiliser l’ordre magnétique cycloïdal vers un ordre colinéaire pour une valeur critique de champ magnétique appliqué bien inférieure à celle du composé massif
This work is devoted to the study of epitaxial strain effects on the magnetic structure of BiFeO3 (BFO) multiferroic thin films. The BFO thin layers have been deposited by Pulsed Laser Deposition on various oxide substrates having different lattice parameters spanning a strain range from compressive (ε= -1. 7%) to tensile strain (ε= +1%). 57Fe Mössbauer spectrometry and nuclear resonant scattering measurements at room temperature showed that antiferromagnetic order is very sensitive to epitaxial strain. The bulk-like Fe3+ spins cycloidal modulation of BFO survives at low compressive strain, with a propagation direction along [1-10]. High values of epitaxial strain destabilize the cycloid towards a collinear antiferromagnetic order with a preferential orientation depending on the sign of the strain. At low tensile strain, a new cycloid state is evidenced, with a propagation wave vector along [110]. The various magnetic structures are stable at low temperature, and the Néel temperature of the films hardly varies with strain. Application of an external magnetic field along the normal of the film destabilizes the cycloidal magnetic order towards a collinear state for a critical value of the applied magnetic field much lower than that of the bulk compound
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Lazenka, Vera, Michael Lorenz, Hiwa Modarresi, Manisha Bisht, Rudolf Rüffer, Michael Bonholzer, Marius Grundmann, Bael Margriet J. Van, André Vantomme, and Kristiaan Temst. "Magnetic spin structure and magnetoelectric coupling in BiFeO3-BaTiO3 multilayer." American Institute of Physics, 2015. https://ul.qucosa.de/id/qucosa%3A31215.

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Magnetic spin structures in epitaxial BiFeO3 single layer and an epitaxial BaTiO3/BiFeO3 multilayer thin film have been studied by means of nuclear resonant scattering of synchrotron radiation. We demonstrate a spin reorientation in the 15 x[BaTiO3/BiFeO3] multilayer compared to the single BiFeO3 thin film. Where as in the BiFeO3 film, the net magnetic moment m→ lies in the (1–10) plane, identical to the bulk, m→ in the multilayer points to different polar and azimuthal directions. This spin reorientation indicates that strain and interfaces play a significant role in tuning the magnetic spin order. Furthermore, large difference in the magnetic field dependence of the magnetoelectric coefficient observed between the BiFeO3 single layer and multilayer can be associated with this magnetic spin reorientation.
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Blouzon, Camille. "Photoelectric and magnetic properties of multiferroic domain walls in BiFeO3." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066006/document.

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De tous les matériaux multiferroïques, BiFeO3 est celui qui est le plus étudié. C’est un ferroélectrique, antiferromagnétique dont les températures de transition sont bien au-dessus de la température ambiante. De plus, le couplage magnétoélectrique entre ces deux paramètres d’ordre a été observé aussi bien dans les cristaux que dans les couches minces. BiFeO3 possède également la plus grande polarisation ferroélectrique jamais mesurée, 100µC/cm². De gros efforts sont fournis pour comprendre et exploiter les propriétés physiques de ce matériau. Dans ce but, il est important de pouvoir contrôler sa structure en domaines afin d’étudier les phénomènes émergeant aux parois de ces domaines. C’est l’objectif de cette thèse : étudier quelques une des propriétés de BiFeO3, comme la photoélectricité et le magnétisme, tout en prêtant en parallèle une attention particulière à la caractérisation de ces propriétés, dans un domaine et dans une paroi, avec des techniques originales telles que la microscopie de photocourants à balayage (MPB) et le rayonnement synchrotron ou les champs magnétiques intenses. Les images obtenues par MPB, révèlent qu’un champ dépolarisant proche d’une paroi de domaine à 180° peut améliorer de manière significative le rendement des effets photoélectriques : les parois de domaines peuvent être générées et positionnées dans le but de contrôler localement le rendement de l’effet photoélectrique. De plus, l’imagerie de la figure de diffraction de surface d’un réseau de parois de domaines dans des couches minces, par diffusion magnétique résonante de rayons X, permet de montrer que les parois de domaines entraînent la formation de structures magnétiques particulières qui pourraient donner lieu à une aimantation
Among all multiferroics, BiFeO3 is a material of choice because its two ordering temperatures are well above 300K. It is a ferroelectric antiferromagnet, and magnetoelectric coupling has been demonstrated in bulk and in thin films. Remarkably, BiFeO3 has the largest polarization of all known ferroelectrics (100µC/cm²). A huge research effort is carried out worldwide to understand and exploit the physical properties of this material which requires to design and tailor BiFeO3 on many scales. In this sense, developing methods and tools to control the domain structure is essential to explore new emergent phenomena arising at domain walls. This is the aim of the present PhD work. Some of the original properties of BiFeO3 have been investigated including its photoelectric and magnetic properties. A particular attention is given to characterize in a parallel fashion bulk properties and domain walls properties, using original techniques of characterization such as Scanning Photocurrent Microscopy (SPCM), scattering synchrotron facilities or high field pulses. SPCM mapping reveals that depolarizing fields in the vicinity of a 180° domain wall can significantly improve the photovoltaic efficiency. Thus domain walls can be generated and precisely positioned in order to tailor the local photovoltaic efficiency. Moreover, X-ray resonant magnetic scattering on thin films with periodic domain structure shows that domain walls generate specific magnetic structures with possible uncompensated magnetization
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Books on the topic "BiFeO3"

1

Bracha, Baruch. Shiṿyon ha-kol bifene ha-ḥoḳ. Yerushalayim: Agudah li-zekhuyot ha-ezraḥ be-Yiśraʼel, 1988.

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Bracha, Baruch. Shiṿyon ha-kol bifene ha-ḥoḳ. Yerushalayim: Agudah li-zekhuyot ha-ezraḥ be-Yiśraʼel, 1988.

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Hasson, Shlomo. ha-ʻArvim be-Yiśraʼel: Ḥasamim bifene shiṿyon. Yerushalayim: Mekhon Floreshaimer le-meḥḳere mediniyut, 2006.

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Shlomo, Hasson, Karayanni Michael Mousa, and Floersheimer Institute for Policy Studies., eds. ha-ʻ Aravim be-Yiśraʼel: Ḥasamim bifene shiṿyon. Yerushalayim: Mekhon Floreshaimer le-meḥḳere mediniyut, 2006.

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Gutman, Nava. Shalhevet: En davar ha-ʻomed bifene ha-ratson. Tel Aviv: Masadah, 2008.

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Živković, Miloš. Bife Frojd: Roman. Beograd: Admiral Books, 2013.

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Crvenković, Biljana. Bifon servis: Sevr porcelan iz Belog dvora. Edited by Crvenković Biljana 1974-, Crvenković Biljana 1974-, and Muzej primenjene umetnosti (Belgrade, Serbia). Beograd: Muzej primenjene umetnosti, 2016.

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Itō, Jōichi. Netto de shinkasuru jinrui: Bifoa/afutā, intānetto. [Tokyo]: Kadokawa Gakugei Shuppn, 2015.

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SECUNET '92 (1992 Cologne, Germany). Sicherheit in netzgestützten Informationssystemen: Proceedings des BIFOA-Kongresses SECUNET '92. Braunschweig: Vieweg, 1992.

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Betriebswirtschaftliches Institut für Organisation und Automation. Sicherheit in netzgestützten Informationssystemen: Proceedings des BIFOA-Kongresses SECUNET '90. Wiesbaden: Vieweg+Teubner Verlag, 1990.

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Book chapters on the topic "BiFeO3"

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Kawazoe, Yoshiyuki, Takeshi Kanomata, and Ryunosuke Note. "BiFeO3 (Synthesized Under Pressure)." In High Pressure Materials Properties: Magnetic Properties of Oxides Under Pressure, 756–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-64593-2_208.

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Zhang, Yiling, Paul A. Salvador, and Gregory S. Rohrer. "Ferroelectric-Enhanced Photocatalysis with TiO2/BiFeO3." In Energy Technology 2014, 15–24. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118888735.ch2.

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Cheong, S.-W., H. T. Yi, T. Choi, and A. Hogan. "Switchable Photodiode Effect in Ferroelectric BiFeO3." In Frontiers in Electronic Materials, 36–37. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527667703.ch5.

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Sharma, Subhash, V. E. Alvarez-Montaño, Eunice Vargas Viveros, Rosario I. Yocupicio-Gaxiola, J. M. Siqueiros, and Oscar Raymond Herrera. "Synthesis and Optimization of BiFeO3 and La-Doped BiFeO3 Prepared by the Solid State Reaction Method." In The Minerals, Metals & Materials Series, 593–98. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92381-5_56.

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Kumar, Naveen, Gulshan Dhillon, Ranvir Singh Panwar, Indu Sharma, and Anupreet Kaur Bhatia. "Lead-Free BiFeO3–BaTiO3 Ceramics: An Overview." In Engineering Materials, 181–94. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-7454-9_11.

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Freitas, V. F., F. R. Estrada, G. S. Dias, L. F. Cótica, I. A. Santos, D. Garcia, and J. A. Eiras. "HR-TEM Investigations in BiFeO3 -PbTiO3 Multifunctional Ceramics." In Ceramic Transactions Series, 215–20. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118511350.ch22.

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Khakhomov, Sergei A., Vladimir E. Gaishun, Dmitry L. Kovalenko, Alina V. Semchenko, Vitali V. Sidsky, Wieslaw Strek, Dariusz Hreniak, et al. "Synthesis of BiFeO3-Powders by Sol-Gel Process." In Recent Advances in Technology Research and Education, 43–48. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99834-3_6.

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Ncube, M., D. Naidoo, K. Bharuth-Ram, D. Billing, H. Masenda, D. R. Sahu, B. K. Roul, and R. M. Erasmus. "XRD and Mössbauer spectroscopy study of Ho doped BiFeO3." In ISIAME 2012, 401–6. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-6491-0_58.

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Guerra, J. D. S., Madhuparna Pal, G. S. Dias, I. A. Santos, R. Guo, and A. S. Bhalla. "Low Temperatures Dielectric Anomaly in BiFeO3 -Based Multiferroic Ceramics." In Processing and Properties of Advanced Ceramics and Composites VII, 77–86. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119183860.ch9.

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Srivastav, Simant Kumar, Swatantra P. Singh, and Kamlesh Kumar. "Perovskite BiFeO3 Nanostructure Photocatalysts for Degradation of Organic Pollutants." In Nanomaterials and Nanocomposites for Environmental Remediation, 141–62. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3256-3_7.

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Conference papers on the topic "BiFeO3"

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Satpathy, S. K., N. K. Mohanty, A. K. Behera, B. Behera, and P. Nayak. "A note on structural and dielectric properties of BiFeO3- PbTiO3 and BiFeO3- PbZrO3 composites." In NANOFORUM 2014. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4918213.

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Rader, Claire, Megan F. Nielson, Brittany E. Knighton, Aldair Alejandro, and Jeremy A. Johnson. "2D THz Measurement of Magnon-Phonon Coupling in Multiferroic BiFeO3." In CLEO: Fundamental Science. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_fs.2023.ff1g.4.

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With 2D THz spectroscopy we directly measure magnon-phonon coupling in multiferroic BiFeO3. Using theoretical modeling, we are able to decipher different types of coupling that appear in 2D spectral features.
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Song, Wei, Dong Zhang, Zhi Sun, Bai Han, Li-juan He, Xuan Wang, and Qing-quan Lei. "Preparation and characterization of multiferroic BiFeO3." In 2012 IEEE 10th International Conference on the Properties and Applications of Dielectric Materials (ICPADM). IEEE, 2012. http://dx.doi.org/10.1109/icpadm.2012.6318899.

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Sanjoom, Kachaporn, Kamonpan Pengpat, Sukum Eitssayeam, Gobwute Rujijanagul, and Parkpoom Jarupoom. "Dielectric properties of modified BiFeO3 ceramics." In 2013 Joint IEEE Int'l Symp on Applications of Ferroelectrics & Workshop on Piezoresponse Force Microscopy (ISAF/PFM). IEEE, 2013. http://dx.doi.org/10.1109/isaf.2013.6748733.

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Rana, Subhasis, Nabanita Dutta, S. K. Bandyopadhyay, Pintu Sen, and A. K. Himanshu. "High capacitance in BiFeO3 nanorod structure." In SOLID STATE PHYSICS: Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4872563.

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Sando, D., J. Allibe, E. Jacquet, S. Fusil, K. Bouzehouane, C. Carrétéro, C. Deranlot, et al. "BiFeO3 Heterostructures for Electro-Optic Modulators." In Frontiers in Optics. Washington, D.C.: OSA, 2011. http://dx.doi.org/10.1364/fio.2011.fthw2.

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Alam, Didarul, Michael Chini, and Volodymyr Turkowski. "Electron Correlations and Memory Effects in High Harmonic Generation from Perovskite BiFeO3." In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_at.2023.jw2a.125.

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Abstract:
We analyze the effects of electron correlations and memory in high harmonic generation from BiFeO3 using Dynamical Mean-Field Theory and Time-Dependent Density-Functional Theory. We observe both effects lead to an extension of the harmonic cutoff.
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Chauhan, Sunil, Manoj Kumar, Sandeep Chhoker, and S. C. Katyal. "Size dependent structural, vibrational and magnetic properties of BiFeO3 and core-shell structured BiFeO3@SiO2 nanoparticles." In SOLID STATE PHYSICS: Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4872660.

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Feng, L., S. Yang, D. Zhang, W. Huang, Y. Yin, S. Dong, W. Zhao, and X. Li. "Resistive switching in Au/BiFeO3/La0.6Sr0.4MnO3 heterostructures." In 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7157311.

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Song, Wei, Bai Han, Dong Zhang, Zhi Sun, Xuan Wang, and Qingquan Lei. "Preparation and properties of BiFeO3/LDPE nanocomposite." In 2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials (ICPADM). IEEE, 2015. http://dx.doi.org/10.1109/icpadm.2015.7295393.

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Reports on the topic "BiFeO3"

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Zapf, Vivien. Magneto-electric coupling measurements in BiFeO3-BiMnO3 heterostructures and thin films. Office of Scientific and Technical Information (OSTI), December 2012. http://dx.doi.org/10.2172/1058052.

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