Relevant bibliographies by topics / A-site ordered perovskite oxide

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'A-site ordered perovskite oxide'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "A-site ordered perovskite oxide"

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Mitchell, Roger H., Mark D. Welch, and Anton R. Chakhmouradian. "Nomenclature of the perovskite supergroup: A hierarchical system of classification based on crystal structure and composition." Mineralogical Magazine 81, no. 3 (2017): 411–61. http://dx.doi.org/10.1180/minmag.2016.080.156.

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AbstractOn the basis of extensive studies of synthetic perovskite-structured compounds it is possible to derive a hierarchy of hettotype structures which are derivatives of the arisotypic cubic perovskite structure (ABX3), exemplified by SrTiO3 (tausonite) or KMgF3 (parascandolaite) by: (1) tilting and distortion of the BX6 octahedra; (2) ordering of A- and B-site cations; (3) formation of A-, B- or X-site vacancies. This hierarchical scheme can be applied to some naturally-occurring oxides, fluorides,hydroxides, chlorides, arsenides, intermetallic compounds and silicates which adopt such derivative crystal structures. Application of this hierarchical scheme to naturally-occurring minerals results in the recognition of a perovskite supergroup which is divided into stoichiometric and non-stoichiometricperovskite groups, with both groups further divided into single ABX3 or double A2BB'X6 perovskites. Subgroups, and potential subgroups, of stoichiometric perovskites include: (1) silicate single perovskites of the bridgmanite subgroup;(2) oxide single perovskites of the perovskite subgroup (tausonite, perovskite, loparite, lueshite, isolueshite, lakargiite, megawite); (3) oxide single perovskites of the macedonite subgroup which exhibit second order Jahn-Teller distortions (macedonite, barioperovskite); (4) fluoride singleperovskites of the neighborite subgroup (neighborite, parascandolaite); (5) chloride single perovskites of the chlorocalcite subgroup; (6) B-site cation ordered double fluoride perovskites of the cryolite subgroup (cryolite, elpasolite, simmonsite); (7) B-site cation orderedoxide double perovskites of the vapnikite subgroup [vapnikite, (?) latrappite]. Non-stoichiometric perovskites include: (1) A-site vacant double hydroxides, or hydroxide perovskites, belonging to the söhngeite, schoenfliesite and stottite subgroups; (2) Anion-deficient perovskitesof the brownmillerite subgroup (srebrodolskite, shulamitite); (3) A-site vacant quadruple perovskites (skutterudite subgroup); (4) B-site vacant single perovskites of the oskarssonite subgroup [oskarssonite]; (5) B-site vacant inverse single perovskites of the coheniteand auricupride subgroups; (6) B-site vacant double perovskites of the diaboleite subgroup; (7) anion-deficient partly-inverse B-site quadruple perovskites of the hematophanite subgroup.
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Long, Youwen. "A -site ordered quadruple perovskite oxides." Chinese Physics B 25, no. 7 (2016): 078108. http://dx.doi.org/10.1088/1674-1056/25/7/078108.

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Long, Youwen. "High-pressure synthesis and physical properties of A-site ordered perovskites." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C755. http://dx.doi.org/10.1107/s2053273314092444.

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ABO3-type perovskite oxides exhibit a wide variety of interesting physical properties such as superconductivity, colossal magnetoresistance, multiferroic behavior etc. For a simple ABO3 perovskite, if three quarters of the A site is replaced by a transition metal A', then the so-called A-site ordered double perovskite with the chemical formula of AA'3B4O12 can form. Since both A' and B sites accommodate transition metal ions, in addition to conventional B-B interaction, the new A'-A' and/or A'-B interaction is possible to show up, giving rise to the presence of many novel physical properties. Here we will show our recent research work on the high-pressure synthesis of several A-site ordered perovskites as well as a series of interesting physical properties like temperature- and pressure-induced intermetallic charge transfer, negative thermal expansion, magnetoelectric coupling multiferroic and so on. [1-3]
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Shimakawa, Yuichi, and Takashi Saito. "A-site magnetism in A-site-ordered perovskite-structure oxides." physica status solidi (b) 249, no. 3 (2011): 423–34. http://dx.doi.org/10.1002/pssb.201147477.

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Shimakawa, Yuichi. "Multiple magnetic interactions in ordered perovskite-structure oxides." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C981. http://dx.doi.org/10.1107/s2053273314090184.

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Cation ordering in transition-metal oxides often drastically modifies their properties. We focus on A-and-B-site-ordered quadruple perovskite-structure oxides AA'3B2B'2O12, in which transition-metal ions are included at the A', B, and B' sites in an ordered manner. In such compounds A'-A', A'-B, A'-B', and B-B' interactions compete with each other and play important role in giving rise to unusual properties. The A-and-B-site-ordered quadruple perovskite CaCu3Fe2Sb2O12with magnetic Fe3+at the B site and nonmagnetic Sb5+at the B' site was successfully synthesized under a high-pressure and high-temperature condition. The B-site Fe3+spin sublattice adapts a tetrahedral framework and the Fe3+-Fe3+antiferromagnetic interaction causes geometrical spin frustration as seen in the double perovskite Ca2FeSbO6. With the introduction of Cu2+into the A' site, the frustration is relieved by strong antiferromagnetic A'(Cu2+)-B(Fe3+) interaction, leading to a ferrimagnetic ordering below 160 K. When B'-site Sb5+was replaced with Re5+, another A-and-B-site-ordered quadruple perovskite CaCu3Fe2Re2O12was synthesized by a high-pressure technique. The compound contains magnetic Fe3+at the B site and Re5+at the B' sites, and strong antiferromagnetic A'(Cu2+)-B'(Re5+) interaction overcomes the A'(Cu2+)-B(Fe3+) interaction, leading to a ferrimagnetism with the ferromagnetic A'(Cu2+)-B(Fe3+) spin arrangement below 550 K. More importantly, the electronic structure of CaCu3Fe2Re2O12is half metallic and the compound shows large magnetoresistance by the spin-dependent transport.
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Shimakawa, Y. "A-site ordered perovskite-structure oxides with functional properties." Acta Crystallographica Section A Foundations of Crystallography 67, a1 (2011): C178. http://dx.doi.org/10.1107/s0108767311095572.

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Ksoll, Philipp, Christoph Meyer, Leonard Schüler, Vladimir Roddatis, and Vasily Moshnyaga. "B-Site Cation Ordering in Films, Superlattices, and Layer-by-Layer-Grown Double Perovskites." Crystals 11, no. 7 (2021): 734. http://dx.doi.org/10.3390/cryst11070734.

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The preparation of cation-ordered thin films of correlated oxides is of great interest for both fundamental and applied research. The scientific long-term vision is strongly motivated by the perspective of studying electronic correlations in condensed matter without the presence of chemical or quenched disorder. A promising material platform provides double perovskite A2BB’O6 bulk samples with different types of B/B’ ordering. However, the growth of A- and/or B-site-ordered correlated oxide thin films is known to be a challenging task. In this review, we evaluate the growth of double perovskite A2BB’O6 thin films by means of well-elaborated physical vacuum deposition techniques, such as pulsed laser deposition (PLD) and sputtering and compare them with a close-to-equilibrium growth with the metalorganic aerosol deposition (MAD) technique. The latter was further developed to grow an emergent interfacial double perovskite phase in LaNiO3/LaMnO3 superlattices, and finally, by way of a layer-by-layer route. The growth of La2CoMnO6 films on SrTiO3(111) substrates by sequential deposition of single perovskite layers of LaCoO3/LaMnO3/LaCoO3/… was demonstrated and the film properties were compared to those obtained within the state-of-the art growth mode.
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Deng, Jianming, Feifei Han, Björn Schwarz, et al. "Dielectric Relaxation and Magnetic Structure of A-Site-Ordered Perovskite Oxide Semiconductor CaCu3Fe2Ta2O12." Inorganic Chemistry 60, no. 10 (2021): 6999–7007. http://dx.doi.org/10.1021/acs.inorgchem.0c03229.

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Zhang, Guangbiao, Yuanxu Wang, Zhenxiang Cheng, et al. "A class of rare antiferromagnetic metallic oxides: double perovskite AMn3V4O12 (A = Na+, Ca2+, and La3+) and the site-selective doping effect." Physical Chemistry Chemical Physics 17, no. 19 (2015): 12717–21. http://dx.doi.org/10.1039/c5cp00186b.

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Shimakawa, Yuichi, and Masaichiro Mizumaki. "Multiple magnetic interactions in A-site-ordered perovskite-structure oxides." Journal of Physics: Condensed Matter 26, no. 47 (2014): 473203. http://dx.doi.org/10.1088/0953-8984/26/47/473203.

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Dissertations / Theses on the topic "A-site ordered perovskite oxide"

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Akizuki, Yasuhide. "High-Pressure Synthesis and Properties of Novel Perovskite Oxides." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199319.

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Li, Linhao. "Oxide ion conduction in A-site Bi-containing perovskite-type ceramics." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/16046/.

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Oxide ion conductors have drawn significant attention due to their important technical applications in electrochemical devices. This project is based on a new oxide ion conductor Na0.5Bi0.5TiO3 (NBT) which indicates (undoped) conducting NBT is a potential electrolyte material that possesses a high level of nearly pure oxide ion conduction. Na non-stoichiometry in the starting composition (Na-series), acceptor doping (Mg2+ → Ti4+, Na0.5Bi0.5Ti1-xMgxO3-x) and donor doping (Nb5+ → Ti4+, Na0.5Bi0.5Ti1-xNbxO3+x/2) in NBT have been investigated. It has been shown that similar to a previously reported Bi non-stoichiometric series (Bi-series), the electrical properties of NBT are highly sensitive to low levels of Na non-stoichiometry. However, the defect mechanisms for Na and Bi non-stoichiometry are different and leads to a contrasting influence on the properties of NBT ceramics. Na-rich samples from the Na-series behave like Bi-deficient samples from the Bi-series whereas Na-deficient samples from the Na-series behave like Bi-rich samples from the Bi-series. Generally speaking, the bulk conductivity (oxide ion conduction) of NBT is dependent on the Na/Bi ratio in the nominal starting composition. Samples with a Na/Bi ratio ≥ 1 exhibit high, nearly pure oxygen ion conduction with a low activation energy (< 0.9 eV) for bulk conduction whereas samples with a Na/Bi ratio < 1 are electronic insulators with a high activation energy (~ 1.6 eV) for bulk conduction. Mg B-site acceptor doping, (Na,Bi)Ti1-xMgxO3-x, can further enhance the bulk conductivity and produces oxide ion transport numbers, tion, close to unity. This doping also stabilises NBT ceramics to reducing atmospheres (eg 5%H2/95%N2 at 500 oC) to demonstrate their potential as an electrolyte material for Intermediate Temperature Solid Oxide Fuel Cells. In contrast, Nb donor doping, (Na,Bi)Ti1-xNbxO3+x/2, systematically suppresses the oxide-ion conductivity; very low levels of Nb doping (0.002 ~ 0.003) leads to a mixed oxide ion and n-type conduction and an intermediate tion (~ 0.5). A further increase of Nb doping level (≥ 0.005) suppresses the oxide ion conduction and results in dielectric materials with predominant n-type electronic bulk conduction with tion ≤ 0.07 at elevated temperature (eg > 600 oC). It is worth noting that, extremely Bi-rich (undoped) NBT (Bi ≥ 0.52) also induces mixed ionic/electronic behaviour by reintroducing higher oxide-ion conductivity with tion ~ 0.4–0.6. The ferroelectric Aurivillius phase Bi4Ti3O12 (BiT) has also been determined to exhibit high levels of oxide ion conduction. Un-doped BiT shows mixed p-type and oxide ion conduction at low temperature; however, tion approaches near unity close to the Curie Temperature, TC ~ 675 oC. As BiT contains both extrinsic and intrinsic defects, the Bi nonstoichiometry has limited influence on its electrical properties. Isovalent doping (La3+ → Bi3+; Bi4-xLaxTi3O12) acceptor doping (Sr2+ → Bi3+; Bi4-xSrxTi3O12-x/2) and donor doping (Nb5+ → Ti4+; Bi4Ti3-xNbxO12+x/2) are all investigated. La-doping (x ≤ 2) can shift TC to lower temperature and makes BiT a potentially good oxygen ion conductor at ~ 600 oC, but the bulk conductivity gradually reduces with increasing x. Sr-doping has a rather limited solid solution limit (x ≤ 0.12) compared to La doping but can maintain the bulk conductivity while lowering the TC. Nb donor doping on Ti-site can compensate oxygen vacancies and suppress the oxide ion conduction. K0.5Bi0.5TiO3 (KBT) has been determined to be a mixed conductor where the ionic contribution can be oxide ions and/or protons. The proton conduction in KBT is controlled by the K/Bi ratio in the nominal starting composition. Samples with a starting K/Bi ratio > 1 exhibit substantial proton conductivity whereas samples with a starting K/Bi ratio ≤ 1 exhibit lower proton conduction. Compared to NBT, the oxide ion conduction in KBT is significantly lower and relatively independent of the starting A-site non-stoichiometry.
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Aljaberi, Ahmed D. A. "Development and characterisation of an A-site deficient perovskite as alternative anode material for solid oxide fuel cells." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3690.

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The research presented in this thesis is a collection of many different, yet connected, parts that stemmed from the development of a new alternative material intended to be utilised as anode material in solid oxide fuel cells. The main part is the research conducted in the development and characterisation of the novel A-site deficient La₀.2₂Sr₀.₇₋ₓCaₓTiO₃. Calcium introduction resulted in reducing this perovskite unit cell volume which, at the beginning, enhanced its electrical conductivity in reducing conditions. However, the ideal cubic symmetry coud not be maintained, as in the starting material LA₀.₂Sr₀.₇TiO₃, as a result of the increased A-site ionic radius mismatch and two lower symmetries were observed at room temperature. These were the tetragonal I4/mcm for 0.1 ≤ x ≤ 0.35 and orthorhombic Pbnm for 0.4 ≤ x ≤ 0.7. Higher temperature NPD data showed that the orthorhombic samples transformed into higher symmetries with Pbnm → I4/mcm → Pm3-m phase transitions. Detailed crystallographic analysis is discussed; where the different unit cells showed changes to the tilts of the BO₆ octahedra, along with distortions to these octahedra. DC conductivity measurements showed a high electrical conductivity of 27.5 S/cm for a pre-reduced composition La₀.₂Sr₀.₂₅Ca₀.₄₅TiO₃ at 900°C and pO₂ = 10⁻¹⁹ atm. This material showed very encouraging features; which makes it a very promising anode material for SOFCs. A study was also done which explores the best renewable energy options for the United Arab Emirates given its local climate and other aspects. The reliance on seawater desalination is argued to by unsustainable for different reasons. Thus, water security should be a main element in the planning process for adopting renewable energy technologies. A system that combines different technologies; with a focus on fuel cells technology; is outlined which is thought of to be a very promising basis for a broader system that will secure power and water in a very environment friendly way. Different compositions of the system La₀.₂Sr₀.₇₋ₓCaₓTiO₃ were also studied using AC impedance spectroscopy in order to establish whether or not this system can show a ferroelectric behaviour. Results showed a variation in the dielectric constant of different samples with temperature; however, no Curie point was observed. Nonetheless, the results did show that the different compositions were very homogeneous when fully oxygenated and there were some indications of possible symmetry changes at sub-ambient temperatures. The final part of this thesis outlined the work done towards the development of a new analytical instrument. An existing TGA instrument was altered in order to provide a simultaneous thermogravimetric analysis and DC conductivity measurement for solid solutions at controlled temperature and oxygen partial pressure. Results were obtained for different samples of the system La₀.₂Sr₀.₇₋ₓCaₓTiO₃ which showed a great dependence of the electrical conductivity on the oxygen stoichiometry in these oxides. Also, a direct method is possible with this instrument to estimate the oxygen chemical diffusion coefficient using the electrical conductivity relaxation method. This new setup will be very useful for different electrochemical and thermal studies which can broaden the understanding of the different mechanisms that affect the performance of different solid state materials.
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Book chapters on the topic "A-site ordered perovskite oxide"

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Yamaguchi, Syuhei, Hiroki Wada, Takahisa Okuwa, and Hidenori Yahiro. "Cyanosilylation of Benzaldehyde with Trimethylsilyl Cyanide Over A-Site Metal Substituted Perovskite-Type Oxide Catalyst Prepared by Thermal Decomposition of Heteronuclear Cyano Complex Precursors." In Ceramic Transactions Series. John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119234463.ch8.

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Kumar Singh, Manoj, Pratik V. Shinde, Pratap Singh, and Pawan Kumar Tyagi. "Two-Dimensional Materials for Advanced Solar Cells." In Solar Cells - Theory, Materials and Recent Advances. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.94114.

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Inorganic crystalline silicon solar cells account for more than 90% of the market despite a recent surge in research efforts to develop new architectures and materials such as organics and perovskites. The reason why most commercial solar cells are using crystalline silicon as the absorber layer include long-term stability, the abundance of silicone, relatively low manufacturing costs, ability for doping by other elements, and native oxide passivation layer. However, the indirect band gap nature of crystalline silicon makes it a poor light emitter, limiting its solar conversion efficiency. For instance, compared to the extraordinary high light absorption coefficient of perovskites, silicon requires 1000 times more material to absorb the same amount of sunlight. In order to reduce the cost per watt and improve watt per gram utilization of future generations of solar cells, reducing the active absorber thickness is a key design requirement. This is where novel two-dimensional (2d) materials like graphene, MoS2 come into play because they could lead to thinner, lightweight and flexible solar cells. In this chapter, we aim to follow up on the most important and novel developments that have been recently reported on solar cells. Section-2 is devoted to the properties, synthesis techniques of different 2d materials like graphene, TMDs, and perovskites. In the next section-3, various types of photovoltaic cells, 2d Schottky, 2d homojunction, and 2d heterojunction have been described. Systematic development to enhance the PCE with recent techniques has been discussed in section-4. Also, 2d Ruddlesden-Popper perovskite explained briefly. New developments in the field of the solar cell via upconversion and downconversion processes are illustrated and described in section-5. The next section is dedicated to the recent developments and challenges in the fabrication of 2d photovoltaic cells, additionally with various applications. Finally, we will also address future directions yet to be explored for enhancing the performance of solar cells.
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Cao, Gang, and Lance E. DeLong. "Magnetic Frustration." In Physics of Spin-Orbit-Coupled Oxides. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780199602025.003.0003.

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Spins often prefer to anti-align with their neighbors in antiferromagnetic correlation. Materials with triangle lattices exhibit energetic degeneracy among the possible rearrangements of anti-aligned spins, which is denoted geometric frustration that is associated with strongly depressed transitions to magnetic order. Honeycomb iridates and ruthenates, pyrochlore systems, and double-perovskite iridates all feature triangular lattices as primary building blocks of their structures. Another frustration mechanism evolves from the Kitaev’s exact solution of a spin-liquid model on a honeycomb lattice with strong spin-orbit interactions. The protracted search for a Kitaev spin liquid has recently focused on the honeycomb itidates Na<sub>2</sub>IrO<sub>3</sub> and Li<sub>2</sub>IrO<sub>3</sub>. A newer kind of quantum liquid has been identified in the magnetic insulator Ba<sub>4</sub>Ir<sub>3</sub>O<sub>10</sub>, where Ir<sub>3</sub>O<sub>12</sub> trimers form an unfrustrated square lattice.
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Maxim, Florentina, Alina Botea-Petcu, Florina Teodorescu, Ludwig J. Gauckler, and Speranta Tanasescu. "Thermodynamic Stability and Microscopic Behavior of BaxSr1-xCo1-yFeyO3-δ Perovskites." In Structure Processing Properties Relationships in Stoichiometric and Nonstoichiometric Oxides. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94028.

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The mixed conducting perovskite-type oxides BaxSr1-xCo1-yFeyO3-δ (BSCF) are intensively studied as potential high-performance solid oxide fuel cell cathode materials. The effect of different compositional variables and oxygen stoichiometry on the structure and thermodynamic stability of the BaxSr1-xCo1-yFeyO3-δ (x = 0.2, 0.4, 0.5, 0.6, 0.8; y = 0.2, 0.4, 0.6, 0.8, 1) perovskite-type compositions were investigated by solid electrolyte electrochemical cells method and scanning electron microscopy (SEM). The thermodynamic quantities represented by the partial molar free energies, enthalpies and entropies of oxygen dissolution in the perovskite phase, as well as the equilibrium partial pressures of oxygen were obtained in the temperature range of 823–1273 K. The in situ change of oxygen stoichiometry and the determination of thermodynamic parameters of the new oxygen-deficient BSCF compositions were studied via coulometric titration technique coupled with electromotive force (EMF) measurements. The effect of A- and B-site dopants concentration correlated to the variation of oxygen stoichiometry on the thermodynamic stability and morphology of the BSCF samples was evidenced.
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Conference papers on the topic "A-site ordered perovskite oxide"

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Ding, Haoran, Yongqing Xu, Linyi Xiang, et al. "Synthesis of CeO2 Supported BaCoO3 Perovskites for Chemical-Looping Methane Reforming to Syngas and Hydrogen." In ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/power-icope2017-3246.

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In order to reduce the hotspots in partial oxidation of methane, CeO2 supported BaCoO3 perogvskite-type oxides were synthesized using a sol-gel method and applied in chemical-looping steam methane reforming (CL-SMR). The synthesized BaCoO3-CeO2 was characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). XRD and XPS results suggested that the obtained BaCoO3 was pure crystalline perovskite, its crystalline structure and lattice oxygen could regenerate after calcining. The reactivity of perovskite-type oxides in CL-SMR was evaluated using a fixed-bed reactor. Gas production rates and H2/CO ratios showed that the optimal reaction temperature was about 860 °C and the properly reaction time in fuel reactor was about 180s when Weight Hourly Space Velocity (WHSV) was 23.57 h−1. The syngas production in fuel reactor were 265.11 ml/g, hydrogen production in reforming reactor were 82.53 ml/g. (CSPE)
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Katayama, T., A. Chikamatsu, T. Fukumura, and T. Hasegawa. "Topotactic Reductive Synthesis of A-site Cation-Ordered Perovskite YBaCo2Ox (x = 4.5-5.5) Epitaxial Thin Films." In 2015 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2015. http://dx.doi.org/10.7567/ssdm.2015.o-2-4.

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Shieh, Jay, Szu-Wei Chen, and Chia-Yu Fang. "Photocurrent Response of Composite Perovskite Oxide Thin Films With Specific Semiconducting and Ferroelectric Properties." In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3058.

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The goal of this study is to investigate photocatalytic semiconductor systems which are layered thin film composites built from perovskite oxide materials with characteristics such as small and large band gaps and/or ferroelectricity. In order to improve the efficiency of photocatalysis, semiconductor heterojunctions within the developed composites have been designed to possess electronic band offsets favoring the separation of photo-induced electron and hole (e−/h+) pairs. Furthermore, the remanent polarization of the ferroelectric component within the composites has been utilized to induce favorable band bending at the material interface, lowering the potential barrier for electron transfer. The band offsets and ferroelectric polarization could be considered as built-in electric fields; how they interact with photo-induced e−/h+ would greatly affect the photocatalytic properties of the composites. In this study, various perovskite oxide thin film materials — large band gap strontium titanate (SrTiO3), small band gap silver niobate (AgNbO3) and ferroelectric lead lanthanum titanate (PLT) — were combined to form layered thin film composites. The composites were then adopted as photoanodes in a photoelectrochemical cell and detailed characterization of their photocurrent response was carried out under different light irradiation and ferroelectric polarization conditions. Electronic band offsets at the material interface (i.e., heterojunction) were determined by ultraviolet-visible spectrophotometry and ultraviolet photoelectron spectroscopy. Electric field poling of the ferroelectric component was achieved by non-contact corona charging. Our results have shown that the band offsets at the SrTiO3-AgNbO3 heterojunction were about 1.0 eV in conduction band edge and 0.4 eV in valence band edge, promoting the rapid separation of photo-induced charge carriers; i.e., the flow of e− from SrTiO3 to AgNbO3 and the flow of h+ from AgNbO3 to SrTiO3. It was found that ferroelectric PLT could be used as a seeding layer for the low-temperature (500 °C) growth of SrTiO3/AgNbO3 thin film composites on ITO/glass substrates, forming a layered structure of SrTiO3/AgNbO3/PLT/ITO. In addition, the photocurrent density of the composites could be increased by depositing gold nanoparticles at the PLT-ITO interface. When the polarization of the PLT layer was poled toward the AgNbO3 layer, the potential barrier associated with the flow of e− to the ITO electrode was reduced by favorable band bending created at the AgNbO3-PLT interface. This resulted in a significant increase in photocurrent density.
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Park, Kwangjin, Seungwhan Baek, and Joongmyeon Bae. "Characterization of PSCF3737 for Intermediate Temperature-Operating Solid Oxide Fuel Cell (IT-SOFC)." In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65042.

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Pr0.3Sr0.7Co0.3Fe0.7O3−δ (PSCF3737) was prepared and characterized as a cathode material for intermediate temperature-operating solid oxide fuel cell (IT-SOFC). X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), extended X-ray absorption fine structure (EXAFS), and electrical property measurement were performed to study cathode performance of the material. XPS and EXAFS results proved that oxygen vacancy concentration was decreased and lattice constants of the perovskite structure material was increased by doping Fe up to 70 mol% at B-site of the crystal structure, which also extended the distance between oxygen and neighbor atom. Thermal expansion coefficient (TEC) of PSCF3737 is smaller than that of Pr0.3Sr0.7CoO3−δ (PSC37) due to lower oxygen vacancy concentration. PSCF3737 showed better cathode performance than PSC37. It might be due good adhesion by a smaller difference of TEC between Gd0.1Ce0.9O2 (CGO91) and electrode. Composite material PSCF3737-CGO91 showed better compatibility of TEC than PSCF3737. However, PSCF3737-CGO91 did not represent higher electrochemical property than PSCF3737 due to a decline of reaction sites by CGO91.
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