Relevant bibliographies by topics / Baryum – Composés – Structure

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Academic literature on the topic 'Baryum – Composés – Structure'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Baryum – Composés – Structure"

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Hoshina, Takuya, Hirofumi Kakemoto, Takaaki Tsurumi, Masatomo Yashima, Yoshihiro Kuroiwa, and Satoshi Wada. "Phase Transition Behavior of Barium Titanate Nanoparticles." Key Engineering Materials 320 (September 2006): 131–34. http://dx.doi.org/10.4028/www.scientific.net/kem.320.131.

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Almost impurity-free, defect-free and dense barium titanate (BaTiO3) fine particles with various sizes from 20 to 430 nm were prepared by the 2-step thermal decomposition method and post-heating treatment. The crystal structures of these particles in the range from -150 to 150 °C were investigated using synchrotron radiation XRD measurement. The crystal structure refinement using Rietveld method revealed that BaTiO3 particles with the size over 40 nm were composed of two parts; (a) cubic shell and (b) core with successive phase transitions. The crystal structure of the core component can be re
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Jiao, Chun Rong, Da Ming Chen, and Jian Feng Tong. "Preparation of the Barium Strontium Titanate/Magnesium Oxide Plates by Non-Aqueous Gel-Casting." Advanced Materials Research 105-106 (April 2010): 794–97. http://dx.doi.org/10.4028/www.scientific.net/amr.105-106.794.

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Barium strontium titanate/magnesium oxide composite ceramic plates were prepared by non-aqueous gel-casting using barium strontium titanate and MgO as the raw materials. The rheological properties of the non-aqueous slurries, the dosages of the catalyst and initiator, micro structures and phase structures of the sintering ceramic plates were investigated and analyzed. The results showed that the slurry with solid content of 50wt% in non-aqueous gel-casting had excellent rheological properties and operating characteristics. Ba0.6Sr0.4TiO3/MgO plates with a smooth surface and dense structure wer
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Tabatabaee, Masoumeh, Boris-Marko Kukovec, Saeed Amjad, and Masoud R. Shishebor. "Two Different Barium(II) 2D Coordination Polymers Constructed with Pyrazine-2,3-Dicarboxylate: Synthesis, Crystal Structures, and Thermal Decomposition to Barium(II) Carbonate Nanoparticles." Australian Journal of Chemistry 69, no. 11 (2016): 1261. http://dx.doi.org/10.1071/ch16091.

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Two novel barium(ii) 2D coordination polymers, {[Ba(µ-H2O)(H2O)2(µ-pyzdc)]}n (1) and {[Ba(H2O)2(µ-Hpyzdc)(Hpyzdc)]⋅2H2O}n (2) (pyzdcH2 = pyrazine-2,3-dicarboxylic acid), were prepared by reaction of barium(ii) chloride dihydrate and pyrazine-2,3-dicarboxylic acid under similar experimental conditions (slightly different pH values) and characterised by elemental analysis, IR spectroscopy, and thermogravimetric analysis/differential thermal analysis methods. Their crystal structures were determined by single-crystal X-ray structure analysis and it was revealed that the barium(ii) ion has a disto
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Pan, Ming-Yan, Sheng-Qing Xia, and Xu-Tang Tao. "Crystal structure of Ba5In4Sb6." Acta Crystallographica Section E Crystallographic Communications 71, no. 5 (2015): i4. http://dx.doi.org/10.1107/s2056989015006933.

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The title compound, pentabarium tetraindium hexaantimony, was synthesized by an indium-flux reaction and its structure features layers composed of edge-sharing In2Sb6units. The voids between the In4Sb6layers are filled by Ba2+cations, which are all surrounded by six Sb atoms and form bicapped octahedral or triangular prismatic coordination geometries. There are five barium ions in the asymmetric unit: one has no imposed crystallographic symmetry, two lie on mirror planes and two havemm2 point symmetry. The two In atoms and four Sb atoms in the asymmetric unit all lie on general crystallographi
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N'Faoui, Fatima-Ezahra, Jilali Aride, Ali Boukhari, M'Hamed Taibi, Mohamed Saadi, and Lahcen El Ammari. "Crystal structure of Ba2Co(BO3)2." Acta Crystallographica Section E Crystallographic Communications 75, no. 3 (2019): 388–91. http://dx.doi.org/10.1107/s2056989019002597.

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Single crystals of dibarium cobalt(II) bis(orthoborate), Ba2Co(BO3)2, have been obtained from the melt. The crystal structure is composed of two isolated (BO3)3− triangles linked to Co2+ cations. The resulting [CoO5] square pyramids and the borate anions make up branched rows extending parallel to [010]. The barium cations occupy two sites in the voids of this arrangement and exhibit coordination numbers of nine each. A comparison with the structures of other A 2 M(BO3)2 compounds reveals a unique five-coordination of the small metal M in the title compound instead of four- or six-coordination
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Maschmeyer, Elizabeth M., Liurukara D. Sanjeewa, and Kulugammana G. S. Ranmohotti. "Crystal structure of BaMnB2O5containing structurally isolated manganese oxide sheets." Acta Crystallographica Section E Crystallographic Communications 72, no. 9 (2016): 1315–20. http://dx.doi.org/10.1107/s2056989016013074.

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In an attempt to search for mixed alkaline-earth and transition metal pyroborates, the title compound, barium manganese(II) pyroborate, has been synthesized by employing a flux method. The structure of BaMnB2O5is composed of MnO5square pyramids that form Mn2O8dimers by edge-sharing and of pyroborate units ([B2O5]4−) that are composed of two corner-sharing trigonal–planar BO3units. These building blocks share corners to form∞2[MnB2O5]2−layers extending parallel to (100). The Ba2+cations reside in the gap between two manganese pyroborate slabs with a coordination number of nine. The title compou
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Nozawa, Aki, Tetuo Kuwabara, Hiroshi Uchida, Chikako Moriyoshi, Yoshihiro Kuroiwa, and Satoshi Wada. "Preparation of Barium Titanate and Strontium Titanate Nanocube Particles and their Accumulation Using Smart Glue." Key Engineering Materials 421-422 (December 2009): 514–17. http://dx.doi.org/10.4028/www.scientific.net/kem.421-422.514.

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Barium titanate (BaTiO3, BT) and strontium titanate (SrTiO3, ST) nanocube particles were successfully prepared by a solvothermal method. The prepared particles were collected by a centrifugal separator. The X-ray diffraction (XRD) measurement confirmed the formation of perovskite BT and ST nanoparticles with sizes of around 17 nm while a transmittance electron microscope (TEM) observation revealed formation of cubic-shaped nanoparticles with sharp edge and corner. These nanocube particles were monodistributed in hexane with tri-n-octylphosphine oxide (TOPO) as dispersant, separately, and then,
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Kwon, Dongchul, and Lew Rabenberg. "Interpretation of HREM images of m-barium ferrite taken under dynamical scattering conditions." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 478–79. http://dx.doi.org/10.1017/s0424820100138762.

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In HREM analyses of extended structural defects in complex compounds, it is desirable to be able to image atomic columns composed of light elements as well as those composed of heavy elements. For the thinnest possible specimens, HREM image contrast tends to be dominated by the heavy elements, however, it is possible to increase the contribution of the light elements to the image by imaging specimens of somewhat greater thicknesses. This paper presents results from a HREM study of extended defects in M-barium ferrite in which this approach has been successfully applied.Hexagonal ferrites, of w
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Kondo, Shuhei, Chikako Moriyoshi, Yoshihiro Kuroiwa, and Satoshi Wada. "Particle Structure Analysis of Highly-Dispersed Barium Titanate Nanoparticles Obtained from Barium Titanyl Oxalate Nanoparticles and their Dielectric Properties." Key Engineering Materials 421-422 (December 2009): 506–9. http://dx.doi.org/10.4028/www.scientific.net/kem.421-422.506.

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Barium titanate (BaTiO3) nanoparticles were prepared by two-step thermal decomposition method of barium titanyl oxalate nanoparticles with a size of 30 nm. The BaTiO3 particle sizes were changed from 12.3 to 142 nm by control of temperature at 2nd step. The X-ray diffraction (XRD) measurement revealed that a clear splitting of 002 and 200 planes was observed over 40 nm, and the c/a ratio of 1.0089 was obtained for the BaTiO3 nanoparticles with a size of 62.3 nm. This high c/a ratio in the BaTiO3 nanoparticles suggested that its mesoscopic particle structure was composed of very thin surface cu
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Bajac, Branimir, Jelena Vukmirovic, Ivan Tokic, Stevan Ognjanovic, and Vladimir Srdic. "Synthesis and characterization of multilayered BaTiO3/NiFe2O4 thin films." Processing and Application of Ceramics 7, no. 1 (2013): 15–20. http://dx.doi.org/10.2298/pac1301015b.

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Presented research was focused on the fabrication of multiferroic thin film structures, composed of ferrielectric barium titanate perovskite phase and magnetostrictive nickel ferrite spinel phase. The applicability of different, solution based, deposition techniques (film growth from solution, dip coating and spin coating) for the fabrication of multilayered BaTiO3 /NiFe2O4 thin films was investigated. It was shown that only spin coating produces films of desired nanostructure, thickness and smooth and crackfree surfaces.
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Dissertations / Theses on the topic "Baryum – Composés – Structure"

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Bressolles, Jean-Claude. "Elaboration et caracterisation microstructurale de couches ceramiques supraconductrices YBa2Cu3O7-x sur substrat métallique." Toulouse 3, 1993. http://www.theses.fr/1993TOU30177.

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Des couches supraconductrices epaisses (60-90 m) ont ete elaborees sur acier refractaire et sur cuivre. La methode originale de preparation implique une preparation de la surface du metal, une sedimentation de poudres, un pressage et un frittage a haute temperature. Les couches sont obtenues par cosedimentation de poudres yba#2cu#3o#7#-#x et ag. Elles sont directement en contact avec le substrat. Dans le cas d'un substrat en acier, l'accrochage de la couche est assure par la creation a la surface du metal d'une macrorugosite. Les couches presentent une temperature critique de 95 k et une densi
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Foulon, Jean-Dominique. "Contribution à l'étude structurale de phosphites de terres rares, de composés fluorés de l'étain et de complexes moléculaires de Ba, Y et Cu." Montpellier 2, 1992. http://www.theses.fr/1992MON20283.

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Les structures cristallines par diffraction des rayons x sur monocristal de trois sels neutres de phosphites de terres rares, de cinq composes fluores de l'etain et de huit complexes moleculaires de baryum, yttrium et de cuivre ont ete determinees. Les techniques experimentales utilisees ont ete precisees et les differents arrangements structuraux ont ete decrits compose par compose permettant ainsi de degager leurs caracteristiques structurales. Les sels neutres de phosphites de terres rares se presentent sous forme de chaines (phases hydratees) ou de feuillets (phase anhydre). L'evolution st
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Pachot, Stéphanie. "Etudes structurales des composés à échelles de spins du type A14 Cu24 O[41+(delta)] (A = Sr, Ca, Ba, Nd, Y, Na, K)." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10133.

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Novikov, Alexey. "Structure and dynamics of aluminosilicate glasses and melts." Thesis, Orléans, 2017. http://www.theses.fr/2017ORLE2041/document.

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Trois systèmes ternaires (SAS, BAS et ZAS) ont été étudiés dans le cadre de la thèse. Les principaux objectifs étaient l’élaboration et la caractérisation de verres aluminosilicatés de Sr, Ba et Zn peu étudiés auparavant. Une étude systématique a été réalisée sur des aluminosilicates vitreux et dans certains cas sur des aluminosilicates fondus avec différents rapports MO/Al₂O₃ (M = Sr, Ba, Zn) et SiO₂/Al₂O₃. Les compositions étudiées couvrent une partie significative des diagrammes ternaires (des silicates aux verres peralumineux, des compositions pauvres en silice à celles riches en silice).
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Chaillout-Bougerol, Catherine. "Contribution à l'étude du système BaPb(1-x)Bi(x)O(3) : relations entre les propriétés structurales, chimiques et physiques." Grenoble 1, 1986. http://www.theses.fr/1986GRE10017.

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Etude de la solution solide du titre du fait de l'interet suscite par ses proprietes physiques : phrase supraconductrice pour 0,05 x 0,30 avec tc# 13k, transition metal-semiconducteur pour x # 0,30. La structure de ces composes est de type perovskite. Selon la concentration en pb et bi, la structure de base cubique se deforme differemment. Etude de la valence de bi et de la stoechiometrie en oxygene, dans babi0::(3) en particulier. Proposition de modeles qui permettent de concilier divers resultats publies anterieurement concernant les proprietes structurales et physiques
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Marrot, Jérôme. "Action de ciseaux chimiques sur des oxydes métalliques. Evolution et/ou adaptation structurale A M M* 05 E : une formule non usuelle pour pyrochlore, (A = alcalin, M = métal de transition, M* = élément à paire libre E)." Toulouse 3, 1995. http://www.theses.fr/1995TOU30182.

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Les etudes presentees dans ce memoire mettent en evidence un phenomene interessant: la notion de ciseau chimique. Dans les phases du systeme cao-v2o4 de formulation cavno2n+1, l'ajout de cao se traduit dans la structure par l'apparition de cisaillements cristallographiques. Les composes du systeme cao-v2o5 montrent une filiation entre le pentoxyde de vanadium, le metavanadate, le pyrovanadate et l'orthovanadate de calcium. Ici, l'action de cao est plus marquee. Les structures sont decoupees en blocs de dimensions de plus en plus petites. D'autres agents de coupure des structures sont les eleme
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MARTINEZ, LUIS G. "Estudo da estrutura cristalina do composto supercondutor Hgsub(1-x)Resub(x)Basub(2)Casub(2)Cusub(3)Osub(8+delta)-Hg,Re-1223." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11344.

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Made available in DSpace on 2014-10-09T12:50:53Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:59:02Z (GMT). No. of bitstreams: 1 11109.pdf: 12432310 bytes, checksum: c0a31703a7116daea7b5d40b3ca371f2 (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Beudon, Didier. "Etude par microscopie electronique a balayage de la structure en domaines ferroelectriques des cristaux de batio : :(3) tires." Nantes, 1987. http://www.theses.fr/1987NANT2053.

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Etude des domaines ferroelectriques par observation optique, puis attaque chimique. Les cristaux n'ayant subis aucune preparation destructrice, sont observes par microscopie electronique a balayage. L'evolution de la structure en domaines ferroelectriques en fonction de la temperature est suivie en temps reel. La visualisation des domaines ferroelectriques est confirmee par decoration avec agcl
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Cahoreau, Amélie. "Trous d' électrons dans des oxydes de type cuprate supraconducteur. Etude cristallochimique d'une nouvelle famille d' oxyhalogènure de tellure et d' alcalinoterreux A3Te2O6X2 (A=Sr, Ba et X=Cl, Br." Phd thesis, Université Sciences et Technologies - Bordeaux I, 1996. http://tel.archives-ouvertes.fr/tel-00150529.

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Certaines propriétés des cuprates supraconducteurs restent aujourd'hui encore mystérieuses pour le monde scientifique. Ce travail vise a éclaircir l'une d'entre-elles: la nature de leurs porteurs de charge. Une approche théorique a été effectuée sur le composé La2CuO4 puis étendue a des composés de type cuprate supraconducteur exempts de cuivre. Elle consiste en des calculs de potentiel de Madelung et de diagrammes de structure de bandes. Les composes "TlBa2ZnO5" et "TlBa2MgO5" ayant servi de modèles pour ces calculs ont ensuite été préparés puis caractérisés par dosage iodométrique, diffracti
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Vacinova, Jitka. "Etudes structurales des oxydes de platine par les méthodes de diffusion anomale et de D. A. F. S." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10185.

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Nous avons entrepris les etudes structurales de deux systemes d'oxydes de platine: ba/pt/o et bi/pb/pt/o par diffraction electronique et par diffraction des rayons x. Nous avons developpe les techniques experimentales de diffraction anomalous fine structure (dafs) et de diffraction anomale afin de les appliquer aux etudes de materiaux sous forme de monocristaux ou sous forme de poudres. Pour les mesures de dafs nous avons propose deux procedures experimentales differentes: le mode de diffraction multi-monochromatique et le mode de diffraction dispersive. L'information selective des diffuseurs
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Conference papers on the topic "Baryum – Composés – Structure"

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Malakooti, Mohammad H., Florian Julé, and Henry A. Sodano. "Energy Harvesting Performance of Printed Barium Titanate Nanocomposites." In ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-8093.

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Development of nanostructured devices for sensing, energy storage, actuating, and energy harvesting has attracted many researchers. The most common type of functional nanostructures is piezoelectric nanomaterials. Regardless of numerous studies in this area, there is a need for rapid fabrication of nanostructured devices, or simply functional nanocomposites. Here we present a simple, scalable fabrication technique for additive manufacturing of nanocomposite energy harvesting devices composed of barium titanate nanowires. Details on hydrothermal synthesis of barium titanate (BaTiO3) nanowires a
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Koka, Aneesh, and Henry A. Sodano. "Ultra-Long Barium Titanate Nanowire Arrays for Low Frequency Energy Harvesting Applications." In ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/smasis2014-7426.

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Piezoelectric nanowires (NWs) have recently attracted immense interest due to their excellent electro-mechanical coupling behavior that can efficiently enable conversion of low-intensity mechanical vibrations for powering or augmenting batteries of biomedical devices and portable consumer electronics. Specifically, nano-electromechanical systems (NEMS) composed of piezoelectric NWs offer an exciting potential for energy harvesting applications due to their enhanced flexibility, light weight, and compact size. Compared to the bulk form, high aspect ratio NWs can exhibit higher deformation to pr
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Erol, Anil, Sarah Masters, Paris von Lockette, and Zoubeida Ounaies. "On the Modeling and Experimental Validation of Multi-Field Polymer-Based Bimorphs." In ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9178.

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Origami — the Japanese art of folding — has inspired various engineering applications for several decades due to its ability to manipulate complex shapes. In our study, multi-field actuated self-folding Origami structures are developed with the implementation of two classes of smart materials: relaxor ferroelectric polymers and magneto-active elastomers (MAEs). The chosen relaxor ferroelectric is P(VDF-TrFE-CTFE), a P(VDF)-based terpolymer and the MAE is a PDMS substrate with embedded barium hexaferrite particles. At the macroscale, this study involves the modeling of the large deformation of
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