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Auteur : Grafiati
Publié le 7 septembre 2023

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1

Da Silva, Paulo Roberto Nagipe, et Ana Brígida Soares. « Lanthanum based high surface area perovskite-type oxide and application in CO and propane combustion ». Eclética Química Journal 34, no 1 (23 janvier 2018) : 31. http://dx.doi.org/10.26850/1678-4618eqj.v34.1.2009.p31-38.

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The perovskite-type oxides using transition metals present a promising potential as catalysts in total oxidation reaction. The present work investigates the effect of synthesis by oxidant co-precipitation on the catalytic activity of perovskite-type oxides LaBO3 (B= Co, Ni, Mn) in total oxidation of propane and CO. The perovskite-type oxides were characterized by means of X-ray diffraction, nitrogen adsorption (BET method), thermo gravimetric and differential thermal analysis (ATG-DTA) and X-ray photoelectron spectroscopy (XPS). Through a method involving the oxidant co-precipitation it’s possible to obtain catalysts with different BET surface areas, of 33-44 m2/g, according the salts of metal used. The characterization results proved that catalysts have a perovskite phase as well as lanthanum oxide, except LaMnO3, that presents a cationic vacancies and generation for known oxygen excess. The results of catalytic test showed that all oxides have a specific catalytic activity for total oxidation of CO and propane even though the temperatures for total conversion change for each transition metal and substance to be oxidized.
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2

Azuma, Masaki, Yuki Sakai, Takumi Nishikubo, Masaichiro Mizumaki, Tetsu Watanuki, Takashi Mizokawa, Kengo Oka, Hajime Hojo et Makoto Naka. « Systematic charge distribution changes in Bi- and Pb-3d transition metal perovskites ». Dalton Transactions 47, no 5 (2018) : 1371–77. http://dx.doi.org/10.1039/c7dt03244g.

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Charge distribution changes in Bi- and Pb-3d transition metal perovskite type oxides were examined. The change in the depth of the d level of the transition metal causes the intermetallic charge transfer.
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3

Kim, Hyo-Young, Jeeyoung Shin, Il-Chan Jang et Young-Wan Ju. « Hydrothermal Synthesis of Three-Dimensional Perovskite NiMnO3 Oxide and Application in Supercapacitor Electrode ». Energies 13, no 1 (19 décembre 2019) : 36. http://dx.doi.org/10.3390/en13010036.

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Supercapacitors are attractive as a major energy storage device due to their high coulombic efficiency and semi-permanent life cycle. Transition metal oxides are used as electrode material in supercapacitors due to their high conductivity, capacitance, and multiple oxidation states. Nanopowder transition metal oxides exhibit low specific surface area, ion diffusion, electrical conductivity, and structural stability compared with the three-dimensional (3D) structure. Furthermore, unstable performance during long-term testing can occur via structural transition. Therefore, it is necessary to synthesize a transition metal oxide with a high specific surface area and a stable structure for supercapacitor application. Transition metal oxides with a perovskite structure control structural transition and improve conductivity. In this study, a NiMnO3 perovskite oxide with a high specific surface area and electrochemical properties was obtained via hydrothermal synthesis at low temperature. Hydrothermal synthesis was used to fabricate materials with an aqueous solution under high temperature and pressure. The shape and composition were regulated by controlling the hydrothermal synthesis reaction temperature and time. The synthesis of NiMnO3 was controlled by the reaction time to alter the specific surface area and morphology. The prepared perovskite NiMnO3 oxide with a three-dimensional structure can be used as an active electrode material for supercapacitors and electrochemical catalysts. The prepared NiMnO3 perovskite oxide showed a high specific capacitance of 99.03 F·g−1 and excellent cycle stability with a coulombic efficiency of 77% even after 7000 cycles.
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4

Takegahara, Katsuhiko. « Electronic band structures in cubic perovskite-type oxides : bismuthates and transition metal oxides ». Journal of Electron Spectroscopy and Related Phenomena 66, no 3-4 (janvier 1994) : 303–20. http://dx.doi.org/10.1016/0368-2048(93)01853-7.

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5

Tomioka, Y., A. Asamitsu, H. Kuwahara, Y. Moritomo, M. Kasai, R. Kumai et Y. Tokura. « Magnetic-field-induced metal-insulator transition in perovskite-type manganese oxides ». Physica B : Condensed Matter 237-238 (juillet 1997) : 6–10. http://dx.doi.org/10.1016/s0921-4526(97)00013-6.

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6

Sarkar, Abhishek, Ruzica Djenadic, Di Wang, Christina Hein, Ralf Kautenburger, Oliver Clemens et Horst Hahn. « Rare earth and transition metal based entropy stabilised perovskite type oxides ». Journal of the European Ceramic Society 38, no 5 (mai 2018) : 2318–27. http://dx.doi.org/10.1016/j.jeurceramsoc.2017.12.058.

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7

Ishihara, S., M. Yamanaka et N. Nagaosa. « Orbital liquid in perovskite transition-metal oxides ». Physical Review B 56, no 2 (1 juillet 1997) : 686–92. http://dx.doi.org/10.1103/physrevb.56.686.

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8

Kang, Ju Hwan, Aeran Song, Yu Jung Park, Jung Hwa Seo, Bright Walker et Kwun-Bum Chung. « Tungsten-Doped Zinc Oxide and Indium–Zinc Oxide Films as High-Performance Electron-Transport Layers in N–I–P Perovskite Solar Cells ». Polymers 12, no 4 (26 mars 2020) : 737. http://dx.doi.org/10.3390/polym12040737.

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Perovskite solar cells (PSCs) have attracted tremendous research attention due to their potential as a next-generation photovoltaic cell. Transition metal oxides in N–I–P structures have been widely used as electron-transporting materials but the need for a high-temperature sintering step is incompatible with flexible substrate materials and perovskite materials which cannot withstand elevated temperatures. In this work, novel metal oxides prepared by sputtering deposition were investigated as electron-transport layers in planar PSCs with the N–I–P structure. The incorporation of tungsten in the oxide layer led to a power conversion efficiency (PCE) increase from 8.23% to 16.05% due to the enhanced electron transfer and reduced back-recombination. Scanning electron microscope (SEM) images reveal that relatively large grain sizes in the perovskite phase with small grain boundaries were formed when the perovskite was deposited on tungsten-doped films. This study demonstrates that novel metal oxides can be used as in perovskite devices as electron transfer layers to improve the efficiency.
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9

Rodgers, Jennifer A., Anthony J. Williams et J. Paul Attfield. « High-pressure / High-temperature Synthesis of Transition Metal Oxide Perovskites ». Zeitschrift für Naturforschung B 61, no 12 (1 décembre 2006) : 1515–26. http://dx.doi.org/10.1515/znb-2006-1208.

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Perovskite and related Ruddlesden-Popper type transition metal oxides synthesised at high pressures and temperatures during the last decade are reviewed. More than 60 such new materials have been reported since 1995. Important developments have included perovskites with complex cation orderings on A and B sites, multiferroic bismuth-based perovskites, and new manganites showing colossal magnetoresistance (CMR) and charge ordering properties.
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10

Terakura, K., J. Lee, J. Yu, I. V. Solovyev et H. Sawada. « Orbital and charge orderings and magnetism in perovskite-type transition-metal oxides ». Materials Science and Engineering : B 63, no 1-2 (août 1999) : 11–16. http://dx.doi.org/10.1016/s0921-5107(99)00045-8.

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11

Lindenthal, Lorenz, Raffael Rameshan, Harald Summerer, Thomas Ruh, Janko Popovic, Andreas Nenning, Stefan Löffler, Alexander Karl Opitz, Peter Blaha et Christoph Rameshan. « Modifying the Surface Structure of Perovskite-Based Catalysts by Nanoparticle Exsolution ». Catalysts 10, no 3 (1 mars 2020) : 268. http://dx.doi.org/10.3390/catal10030268.

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In heterogeneous catalysis, surfaces decorated with uniformly dispersed, catalytically-active (nano)particles are a key requirement for excellent performance. Beside standard catalyst preparation routines—with limitations in controlling catalyst surface structure (i.e., particle size distribution or dispersion)—we present here a novel time efficient route to precisely tailor catalyst surface morphology and composition of perovskites. Perovskite-type oxides of nominal composition ABO3 with transition metal cations on the B-site can exsolve the B-site transition metal upon controlled reduction. In this exsolution process, the transition metal emerges from the oxide lattice and migrates to the surface where it forms catalytically active nanoparticles. Doping the B-site with reducible and catalytically highly active elements, offers the opportunity of tailoring properties of exsolution catalysts. Here, we present the synthesis of two novel perovskite catalysts Nd0.6Ca0.4FeO3-δ and Nd0.6Ca0.4Fe0.9Co0.1O3-δ with characterisation by (in situ) XRD, SEM/TEM and XPS, supported by theory (DFT+U). Fe nanoparticle formation was observed for Nd0.6Ca0.4FeO3-δ. In comparison, B site cobalt doping leads, already at lower reduction temperatures, to formation of finely dispersed Co nanoparticles on the surface. These novel perovskite-type catalysts are highly promising for applications in chemical energy conversion. First measurements revealed that exsolved Co nanoparticles significantly improve the catalytic activity for CO2 activation via reverse water gas shift reaction.
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12

Moritomo, Y., Sh Xu, A. Machida, T. Akimoto, E. Nishibori, M. Takata et M. Sakata. « Electronic structure of double-perovskite transition-metal oxides ». Physical Review B 61, no 12 (15 mars 2000) : R7827—R7830. http://dx.doi.org/10.1103/physrevb.61.r7827.

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13

Inoue, I. H. « Electrostatic carrier doping to perovskite transition-metal oxides ». Semiconductor Science and Technology 20, no 4 (16 mars 2005) : S112—S120. http://dx.doi.org/10.1088/0268-1242/20/4/013.

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14

Raychaudhuri, A. K., K. P. Rajeev, H. Srikanth et N. Gayathri. « Metal-insulator transition in perovskite oxides : Tunneling experiments ». Physical Review B 51, no 12 (15 mars 1995) : 7421–28. http://dx.doi.org/10.1103/physrevb.51.7421.

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15

Mishra, Anupama, et Ram Prasad. « Synthesis and Performance of Transition Metal Based Perovskite Catalysts for Diesel Soot Oxidation ». Bulletin of Chemical Reaction Engineering & ; Catalysis 12, no 3 (28 octobre 2017) : 469. http://dx.doi.org/10.9767/bcrec.12.3.968.469-477.

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In present investigation, the effect of the intrinsic factors including the structure, nature of B-site ions in the four systems LaCoO3, LaNiO3, LaFeO3 and LaZnOy perovskite-type oxide catalysts, and the external factors of catalyst-soot contacting model, and the operating parameters such as air flow rate and temperature on the catalytic performances for the combustion of diesel soot were reported. The catalysts were characterized by XRD, FTIR, SEM, and N2-sorption. Activity of the catalyst for soot oxidation was evaluated on the basis of light off temperature characteristics Ti, T50 and T100. LaCoO3, LaFeO3 and LaNiO3 samples possessed the perovskite structure, and gave high activities for the total oxidation of soot below 445 oC. Whereas, LaZnOy catalyst was not indicating the ABO3 perovskite structure and existed as a mixture of metal oxides. The activity order in decreasing sequence of the catalyst was as follows: LaCoO3>LaFeO3>LaNiO3>LaZnOy. SEM pictures of the perovskite samples showed that the particles sizes were close to 100 nm. Copyright © 2017 BCREC GROUP. All rights reservedReceived: 2nd March 2017; Revised: 16th June 2017; Accepted: 12nd July 2017; Available online: 27th October 2017; Published regularly: December 2017How to Cite: Mishra, A., Prasad, R. (2017). Synthesis and Performance of Transition Metal Based Perovskite Catalysts for Diesel Soot Oxidation. Bulletin of Chemical Reaction Engineering & Catalysis, 12 (3): 469-477 (doi:10.9767/bcrec.12.3.968.469-477)
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16

Bishop, Alan R. « A Lattice Litany for Transition Metal Oxides ». Condensed Matter 5, no 3 (13 juillet 2020) : 46. http://dx.doi.org/10.3390/condmat5030046.

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In this tribute to K Alex Müller, I describe how his early insights have influenced future decades of research on perovskite ferroelectrics and more broadly transition metal oxides (TMOs) and related quantum materials. I use his influence on my own research journey to discuss impacts in three areas: structural phase transitions, precursor structure, and quantum paraelectricity. I emphasize materials functionality in ground, metastable, and excited states arising from competitions among lattice, charge, and spin degrees of freedom, which results in highly tunable landscapes and complex networks of multiscale configurations controlling macroscopic functions. I discuss competitions between short- and long-range forces as particularly important in TMOs (and related materials classes) because of their localized and directional metal orbitals and the polarizable oxygen ions. I emphasize crucial consequences of elasticity and metal–oxygen charge transfer.
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17

Long, Youwen. « High-pressure synthesis and physical properties of A-site ordered perovskites ». Acta Crystallographica Section A Foundations and Advances 70, a1 (5 août 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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18

Takemoto, M. « Properties of transition metal oxides with layered perovskite structure ». Solid State Ionics 108, no 1-4 (1 mai 1998) : 255–60. http://dx.doi.org/10.1016/s0167-2738(98)00047-2.

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19

Witte, Ralf, Abhishek Sarkar, Leonardo Velasco, Robert Kruk, Richard A. Brand, Benedikt Eggert, Katharina Ollefs, Eugen Weschke, Heiko Wende et Horst Hahn. « Magnetic properties of rare-earth and transition metal based perovskite type high entropy oxides ». Journal of Applied Physics 127, no 18 (14 mai 2020) : 185109. http://dx.doi.org/10.1063/5.0004125.

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20

Zhang, Lei, Sha Xiangling, Zhang Lei, Huibin He, Yusu Wang, Zhenhua Ma et Yonghui Li. « Study on the Desulfurization Performance of N-Type and P-Type Semiconductor Pyrolysis Char Composite Catalyst ». Journal of Environmental Science and Management 20, no 1 (30 juin 2017) : 10–17. http://dx.doi.org/10.47125/jesam/2017_1/02.

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Ordos coal pyrolysis product roasted under 750oC was used as desulfurization sorbents to investigate the effect of flue gas desulfurization performance of supported metal catalyst. There were 14 kinds of metal oxides from groups IA, IIA, VIB, VIIB, VIII, IB and IIIB chosen as active components to prepare metal oxide supported catalysts by equivalent volume impregnation method. And the mechanism of pyrolysis was studied. The similarities of desulfurization performance among the same group of metal oxides were related to the structure of their outer electrons. In addtion, the influence of transition metal oxides on the desulfurization performance was related to metal oxide semiconductor type. Finally, the influence of the VIII group oxide catalyst of iron (Fe), Cobalt (Co), Nickel (Ni) on the desulfurization performance showed the characteristics of diversity related to their d percentage (%).
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Liu, Xingmei, Yuwei Wang, Liquan Fan, Weichao Zhang, Weiyan Cao, Xianxin Han, Xijun Liu et Hongge Jia. « Sm0.5Sr0.5Co1−xNixO3−δ—A Novel Bifunctional Electrocatalyst for Oxygen Reduction/Evolution Reactions ». Molecules 27, no 4 (14 février 2022) : 1263. http://dx.doi.org/10.3390/molecules27041263.

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The development of non-precious metal catalysts with excellent bifunctional activities is significant for air–metal batteries. ABO3-type perovskite oxides can improve their catalytic activity and electronic conductivity by doping transition metal elements at B sites. Here, we develop a novel Sm0.5Sr0.5Co1−xNixO3−δ (SSCN) nanofiber-structured electrocatalyst. In 0.1 M KOH electrolyte solution, Sm0.5Sr0.5Co0.8Ni0.2O3−δ (SSCN82) with the optimal Co: Ni molar ratio exhibits good electrocatalytic activity for OER/ORR, affording a low onset potential of 1.39 V, a slight Tafel slope of 123.8 mV dec−1, and a current density of 6.01 mA cm−2 at 1.8 V, and the ORR reaction process was four-electron reaction pathway. Combining the morphological characteristic of SSCN nanofibers with the synergistic effect of cobalt and nickel with a suitable molar ratio is beneficial to improving the catalytic activity of SSCN perovskite oxides. SSCN82 exhibits good bi-functional catalytic performance and electrochemical double-layer capacitance.
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Xia, Chengliang, Yue Chen et Hanghui Chen. « Pressure-induced metal–insulator transition in oxygen-deficient LiNbO3-type ferroelectrics ». Journal of Physics : Condensed Matter 34, no 2 (28 octobre 2021) : 025501. http://dx.doi.org/10.1088/1361-648x/ac2e30.

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Abstract Hydrostatic pressure and oxygen vacancies usually have deleterious effects on ferroelectric materials because both tend to reduce their polarization. In this work we use first-principles calculations to study an important class of ferroelectric materials—LiNbO3-type ferroelectrics (LiNbO3 as the prototype), and find that in oxygen-deficient LiNbO3−δ , hydrostatic pressure induces an unexpected metal–insulator transition between 8 and 9 GPa. Our calculations also find that strong polar displacements persist in both metallic and insulating oxygen-deficient LiNbO3−δ and the size of polar displacements is comparable to pristine LiNbO3 under the same pressure. These properties are distinct from widely used perovskite ferroelectric oxide BaTiO3, whose polarization is quickly suppressed by hydrostatic pressure and/or oxygen vacancies. The anomalous pressure-driven metal–insulator transition in oxygen-deficient LiNbO3−δ arises from the change of an oxygen vacancy defect state. Hydrostatic pressure increases the polar displacements of oxygen-deficient LiNbO3−δ , which reduces the band width of the defect state and eventually turns it into an in-gap state. In the insulating phase, the in-gap state is further pushed away from the conduction band edge under hydrostatic pressure, which increases the fundamental gap. Our work shows that for LiNbO3-type strong ferroelectrics, oxygen vacancies and hydrostatic pressure combined can lead to new phenomena and potential functions, in contrast to the harmful effects occurring to perovskite ferroelectric oxides such as BaTiO3.
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23

JIANG, ZHI, HAIRONG ZHANG, ZHONGPENG WANG, MINGXIA CHEN et WENFENG SHANGGUAN. « SIMULTANEOUSLY CATALYTIC REMOVAL OF NOx AND SOOT ON RARE EARTH ELEMENT OXIDE LOADED WITH POTASSIUM AND TRANSITION NANOSIZED METAL OXIDES ». Nano 03, no 04 (août 2008) : 239–44. http://dx.doi.org/10.1142/s1793292008001088.

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The simultaneous catalytic removal of NO x and soot over the rare earth element (REE) oxide-based mixture oxides loaded with potassium and transition nanosized metal oxide (designated as M/K/REE oxide) was investigated by using temperature-programmed reaction (TPR). The influence of the type of REE oxides together with the type and amount of transitional metal oxides on the catalytic removal activity was discussed. K / Nd 2 O 3 was found to be the most active oxide among the REE oxides to simultaneous remove the NO x and soot under lean conditions. Chromium oxide was more active than the other transition metal oxides on enhancing the activity of soot oxidation of Nd 2 O 3 loaded with potassium. The optimum loading level of chromium was about 10 wt%, with ignition temperature at about 237°C and the conversion ratio NO → N 2 about 24.1%. The Mn -loading on K / Nd 2 O 3 resulted in the biggest conversion efficiency of NO to N 2 at about 30.2%. The increasing catalytic reaction of NO x–soot activities is attributed to the formation of complex crystalline phase in the catalyst together with the improving contacting between catalysts and soot.
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Raychaudhuri, A. K. « Metal-insulator transition in perovskite oxides : A low-temperature perspective ». Advances in Physics 44, no 1 (janvier 1995) : 21–46. http://dx.doi.org/10.1080/00018739500101486.

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Mitin, Alexander V. « Peculiarities of the insulator-metal transition in perovskite-like oxides ». Czechoslovak Journal of Physics 46, S5 (mai 1996) : 2679–80. http://dx.doi.org/10.1007/bf02570326.

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26

Hong, Wesley T., Marcel Risch, Kelsey A. Stoerzinger, Alexis Grimaud, Jin Suntivich et Yang Shao-Horn. « Toward the rational design of non-precious transition metal oxides for oxygen electrocatalysis ». Energy & ; Environmental Science 8, no 5 (2015) : 1404–27. http://dx.doi.org/10.1039/c4ee03869j.

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The rational design of non-precious transition metal perovskite oxide catalysts holds exceptional promise for understanding and mastering the kinetics of oxygen electrocatalysis instrumental to artificial photosynthesis, solar fuels, fuel cells, electrolyzers, and metal–air batteries.
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27

Goodenough, J. B., et J. S. Zhou. « Localized to Itinerant Electronic Transitions in Transition-Metal Oxides with the Perovskite Structure ». Chemistry of Materials 10, no 10 (octobre 1998) : 2980–93. http://dx.doi.org/10.1021/cm980276u.

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Polfus, Jonathan M., Marie-Laure Fontaine, Annett Thøgersen, Marit Riktor, Truls Norby et Rune Bredesen. « Solubility of transition metal interstitials in proton conducting BaZrO3 and similar perovskite oxides ». Journal of Materials Chemistry A 4, no 21 (2016) : 8105–12. http://dx.doi.org/10.1039/c6ta02377k.

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The defect chemistry of foreign transition metals in perovskite oxides was investigated by first-principles calculations in combination with experiments with focus on Ni and Zn in Y-doped BaZrO3.
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Azuma, Masaki, Hajime Hojo, Kengo Oka, Hajime Yamamoto, Keisuke Shimizu, Kei Shigematsu et Yuki Sakai. « Functional Transition Metal Perovskite Oxides with 6s2 Lone Pair Activity Stabilized by High-Pressure Synthesis ». Annual Review of Materials Research 51, no 1 (26 juillet 2021) : 329–49. http://dx.doi.org/10.1146/annurev-matsci-080819-011831.

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Perovskite ABO3 oxides that have Bi and Pb at the A site and transition metals at the B site, when stabilized by high-pressure synthesis at several gigapascals, provide a rich parameter space of fascinating properties. Stereochemical 6 s2 lone pairs of Bi3+ and Pb2+ induce polar or antipolar distortions. 6 s2 and 6 s0 (Bi5+ and Pb4+) charge degree of freedom enable intermetallic charge transfer transitions. The structural distortion and the charge degree of freedom are coupled with magnetism of transition metals, resulting in various functionalities. In particular, we highlight magnetization reversal by electric field and polarization rotation in BiFe1− xCo xO3, negative thermal expansion in modified BiNiO3 and PbVO3, and systematic charge distribution changes in Pb MO3 ( M = 3 d transition metal).
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30

Mizokawa, T., et A. Fujimori. « Unrestricted Hartree-Fock study of transition-metal oxides : Spin and orbital ordering in perovskite-type lattice ». Physical Review B 51, no 18 (1 mai 1995) : 12880–83. http://dx.doi.org/10.1103/physrevb.51.12880.

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Shimakawa, Yuichi. « Multiple magnetic interactions in ordered perovskite-structure oxides ». Acta Crystallographica Section A Foundations and Advances 70, a1 (5 août 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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Han, Binghong, et Yang Shao-Horn. « (Invited) In-Situ Study of the Activated Lattice Oxygen Redox Reactions in Metal Oxides during Oxygen Evolution Catalysis ». ECS Meeting Abstracts MA2018-01, no 32 (13 avril 2018) : 1935. http://dx.doi.org/10.1149/ma2018-01/32/1935.

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Promoting the oxygen evolution reaction (OER) near room temperature is critical to improve the efficiency of many electrochemical energy storage and conversion techniques, such as water splitting and rechargeable metal-air batteries. Nowadays, researchers have developed many non-precious metal oxides as highly active OER catalysts, including many perovskite oxides (ABO3) of first-row transition metals such as LaCoO3-δ (LCO), SrCoO3-δ (SCO), and Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF). However, understanding the interaction between oxides catalysts and water, which determines the stability and activity of the oxide OER catalysts, is still challenging. Here we report the systematic investigation between water and various perovskite oxides with different electronic structures, using a series of in situ characterization techniques including on-line electrochemical mass spectrometry (OLEMS), environmental transmission electron microscopy (ETEM), and pH-dependent electrochemical tests. It is find that having an oxygen 2p-band closer to the Fermi level and increasing the covalency of metal-oxygen bonds could facilitate the redox reaction of lattice oxygen in perovskites during OER catalysis. In the oxides such as SCO and BSCF with activated lattice oxygen in the OER process, we observe the evolving of 18O-labeled lattice oxygen in OLEMS, the strong pH dependency of OER kinetics in electrochemical measurements, and the structural oscillation in ETEM, which all indicate a new oxygen-site OER mechanism that makes the perovskites more active and less stable. While in the oxides such as LCO with no lattice oxygen activation, all of the above phenomena are missing, implying a stable surface with traditional metal-site OER mechanism. Observing the perovskites in situ during OER allows us to better understand the interaction between electrolytes and oxides, providing us a deeper insight into the stability and active site of oxide catalysts for OER.
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TERAKURA, K. « Magnetism, orbital ordering and lattice distortion in perovskite transition-metal oxides ». Progress in Materials Science 52, no 2-3 (février 2007) : 388–400. http://dx.doi.org/10.1016/j.pmatsci.2006.10.007.

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Hamada, Noriaki, Hideaki Sawada, Igor Solovyev et Kiyoyuki Terakura. « Electronic band structure and lattice distortion in perovskite transition-metal oxides ». Physica B : Condensed Matter 237-238 (juillet 1997) : 11–13. http://dx.doi.org/10.1016/s0921-4526(97)00016-1.

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Hu, Shunbo, Lei Chen, Yabei Wu, Liming Yu, Xinluo Zhao, Shixun Cao, Jincang Zhang et Wei Ren. « Selected multiferroic perovskite oxides containing rare earth and transition metal elements ». Chinese Science Bulletin 59, no 36 (11 octobre 2014) : 5170–79. http://dx.doi.org/10.1007/s11434-014-0643-5.

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Matsumoto, Hiroshige. « Application of Protonic Conduction in Perovskite-Type Oxides : Mixed Proton-Electron-Conducting Membrane for Hydrogen Separation ». Advances in Science and Technology 45 (octobre 2006) : 2024–32. http://dx.doi.org/10.4028/www.scientific.net/ast.45.2024.

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Hydrogen separation is one of the key techniques for the forthcoming hydrogen economy. This paper describes a possible electrochemical method and materials for hydrogen separation: mixed proton-electron-conducting membrane that can permeate hydrogen selectively from hydrogen-containing gases, such as reformed gases of hydrocarbons. Proton-conducting perovskite-type solid electrolytes are first introduced as the base material of the mixed conductor. Some transition metal-doped perovskites are shown to have a mixed conductivity of protonic and electronic charge carriers, revealed by electrochemical and X-ray-spectroscopic measurements.
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37

Gourdon, O., V. Petricek et M. Evain. « A new structure type in the hexagonal perovskite family ; structure determination of the modulated misfit compound Sr9/8TiS3 ». Acta Crystallographica Section B Structural Science 56, no 3 (1 juin 2000) : 409–18. http://dx.doi.org/10.1107/s0108768100002160.

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Sr9/8TiS3, strontium titanium sulfide, a new phase in the hexagonal perovskite-like Sr x TiS3 system, has been prepared and its structure solved from single-crystal X-ray data within the (3 + 1)-dimensional [(3 + 1)D] formalism. Sr9/8TiS3 crystallizes with trigonal symmetry [R3¯m(00γ)0s superspace group], with the following lattice parameters: a s = 11.482 (3), c s = 2.9843 (8) Å, q = 0.56247 (7)c* and V s = 340.7 (3) Å3. The structure was considered as commensurate [R3¯c three-dimensional (3D) space group], but refined within the (3 + 1)D formalism to a residual factor R = 2.79% for 64 parameters and 1084 independent reflections. Original crenel functions were used for the sulfur and strontium description. The structure is different from that of the hexagonal perovskite-like oxide counterparts. The main difference is related to the presence of a new type of polyhedron in the [MS3] transition metal chains, intermediate between the octahedra classically found in such chains and the trigonal prismatic sites encountered in the oxides.
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Bogdanova, Kh G., A. R. Bulatov, V. A. Golenishchev-Kutuzov, R. I. Kalimullin et A. A. Potapov. « Effect of Jahn-Teller distortions on the structural and magnetic ordering in perovskite-type transition-metal oxides ». Bulletin of the Russian Academy of Sciences : Physics 72, no 8 (août 2008) : 1159–61. http://dx.doi.org/10.3103/s1062873808080406.

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Takayama-Muromachi, E. « High-pressure synthesis and physical property measurements of perovskite transition metal oxides ». Acta Crystallographica Section A Foundations of Crystallography 64, a1 (23 août 2008) : C84. http://dx.doi.org/10.1107/s0108767308097298.

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Corà, F., et C. R. A. Catlow. « QM investigations on perovskite-structured transition metal oxides : bulk, surfaces and interfaces ». Faraday Discussions 114 (1999) : 421–42. http://dx.doi.org/10.1039/a904517a.

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Uratani, Y., T. Shishidou, F. Ishii et T. Oguchi. « First-principles exploration of ferromagnetic and ferroelectric double-perovskite transition-metal oxides ». Physica B : Condensed Matter 383, no 1 (août 2006) : 9–12. http://dx.doi.org/10.1016/j.physb.2006.03.035.

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Eisaki, H., T. Ido, K. Magoshi, M. Mochizuki, H. Yamatsu, T. Ito et S. Uchida. « Metal-insulator transition in 3d transition-metal oxides with ABO3 and A2BO4 type structures ». Physica C : Superconductivity 185-189 (décembre 1991) : 1295–96. http://dx.doi.org/10.1016/0921-4534(91)91871-z.

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43

Abhyankar, Nandita, Amit Agrawal, Pragya Shrestha, Russell Maier, Robert D. McMichael, Jason Campbell et Veronika Szalai. « Scalable microresonators for room-temperature detection of electron spin resonance from dilute, sub-nanoliter volume solids ». Science Advances 6, no 44 (octobre 2020) : eabb0620. http://dx.doi.org/10.1126/sciadv.abb0620.

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We report a microresonator platform that allows room temperature detection of electron spins in volumes on the order of 100 pl, and demonstrate its utility to study low levels of dopants in perovskite oxides. We exploit the toroidal moment in a planar anapole, using a single unit of an anapole metamaterial architecture to produce a microwave resonance exhibiting a spatially confined magnetic field hotspot and simultaneously high quality-factor (Q-factor). To demonstrate the broad implementability of this design and its scalability to higher frequencies, we deploy the microresonators in a commercial electron paramagnetic resonance (EPR) spectrometer operating at 10 GHz and a NIST-built EPR spectrometer operating at 35 GHz. We report continuous-wave (CW) EPR spectra for various samples, including a dilute Mn2+-doped perovskite oxide, CaTiO3, and a transition metal complex, CuCl2.2H2O. The anapole microresonator presented here is expected to enable multifrequency EPR characterization of dopants and defects in perovskite oxide microcrystals and other volume-limited materials of technological importance.
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Ohta, Y., T. Toriyama, M. Sakamaki et T. Konishi. « Anomalous electronic states of hollandite-type transition-metal oxides ». Journal of Physics : Conference Series 400, no 3 (17 décembre 2012) : 032070. http://dx.doi.org/10.1088/1742-6596/400/3/032070.

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Fujimori, A., T. Yoshida, K. Okazaki, T. Tsujioka, K. Kobayashi, T. Mizokawa, M. Onoda, T. Katsufuji, Y. Taguchi et Y. Tokura. « Electronic structure of Mott–Hubbard-type transition-metal oxides ». Journal of Electron Spectroscopy and Related Phenomena 117-118 (juin 2001) : 277–86. http://dx.doi.org/10.1016/s0368-2048(01)00253-5.

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46

Kan, Daisuke, Ryotaro Aso, Hiroki Kurata et Yuichi Shimakawa. « Phase control of a perovskite transition-metal oxide through oxygen displacement at the heterointerface ». Dalton Transactions 44, no 23 (2015) : 10594–607. http://dx.doi.org/10.1039/c4dt03749a.

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Wadati, H., T. Yoshida, A. Chikamatsu, H. Kumigashira, M. Oshima, H. Eisaki, Z. X. Shen, T. Mizokawa et A. Fujimori. « Angle-resolved photoemission spectroscopy of perovskite-type transition-metal oxides and their analyses using tight-binding band structure ». Phase Transitions 79, no 8 (août 2006) : 617–35. http://dx.doi.org/10.1080/01411590600826672.

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48

Kim, Bae-Jung, Emiliana Fabbri, Ivano Castelli, Mario Borlaf, Thomas Graule, Maarten Nachtegaal et Thomas Schmidt. « Fe-Doping in Double Perovskite PrBaCo2(1-x)Fe2xO6-δ : Insights into Structural and Electronic Effects to Enhance Oxygen Evolution Catalyst Stability ». Catalysts 9, no 3 (14 mars 2019) : 263. http://dx.doi.org/10.3390/catal9030263.

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Perovskite oxides have been gaining attention for its capability to be designed as an ideal electrocatalyst for oxygen evolution reaction (OER). Among promising candidates, the layered double perovskite—PrBaCo2O6-δ (PBC)—has been identified as the most active perovskite electrocatalyst for OER in alkaline media. For a single transition metal oxide catalyst, the addition of Fe enhances its electrocatalytic performance towards OER. To understand the role of Fe, herein, Fe is incorporated in PBC in different ratios, which yielded PrBaCo2(1-x)Fe2xCo6-δ (x = 0, 0.2 and 0.5). Fe-doped PBCF’s demonstrate enhanced OER activities and stabilities. Operando X-ray absorption spectroscopy (XAS) revealed that Co is more stable in a lower oxidation state upon Fe incorporation by establishing charge stability. Hence, the degradation of Co is inhibited such that the perovskite structure is prolonged under the OER conditions, which allows it to serve as a platform for the oxy(hydroxide) layer formation. Overall, our findings underline synergetic effects of incorporating Fe into Co-based layered double perovskite in achieving a higher activity and stability during oxygen evolution reaction.
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Maltseva, Tetyana, et Valeriy Kublanovsky. « ELECTROCATALYSIS OF THE OXYGEN REACTION ON THE MULTICOMPONENT OXIDES OF TRANSITION METALS ». Ukrainian Chemistry Journal 86, no 12 (15 janvier 2021) : 103–23. http://dx.doi.org/10.33609/2708-129x.86.12.2020.103-123.

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The review presents the current state of research on oxides of transition metals as electrocatalysts for the both reactions of oxygen reduction and evolution, which are of key importance ones for electrochemical devices of alternative energy: metal-air rechargeable batteries and fuel cells with an oxygen electrode. The review includes the consideration of the thermodynamic, electronic and adsorption conditions for activation of the molecular oxygen by oxide surface, as well as the advantages of the oxide surfaces as catalysts in the alkaline electrolytes. The influence of the chemical composition and structural features of oxides of transition elements on the adsorption and chemisorption of water and oxygen, the formation of ionic forms at adsorption and the main factors, which influence on transfer of electrons, protons and oxygen, are considered. Synthesis of double and other multicomponent oxides and the usage of cationic doping expands the possibilities of forming the necessary properties of the electrocatalysts: porosity, thickness of hydrated layers, electronic and ionic conductivity, proton and electron-donor (acceptor) properties in a optimal combination. The oxide should have a metal with variable valence, and even better if there are two ones. Such oxides can be various structures based on Co2O3, MnO2, Ni2O3, Mn3O4, Fe2O3, and others. A qualitative leap in improving the performance of catalysts for electrode reactions with oxygen was made possible by the synthesis of nanoparticles, as well as nanocomposites with metallic and carbon materials. The some characteristics of the electroca­talytic activity of promising oxide electrocata­lysts, mainly, multicomponent ones, as well as the results of studies of oxide composites with carbon nanomaterials, are presented. Several of the most well-known oxide structures (spinel, perovskite, pyrochlor) are currently being studied as the most promising matrices for the efficient transfer of charge, oxygen, and metal ions. All of them are multicomponent. The most active non-platinum bifunctional catalysts for oxygen reactions concluded to be cobaltites with spinel structure. Nanocomposites based on cobalt and cobalt-manganese spinel are the most promising materials for use in alkaline rechargeable batteries, both in terms of cost and in terms of electrocatalytic activity as well as in terms of corrosion resistance.
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Moshnyaga, Vasily, et Konrad Samwer. « Polaronic Emergent Phases in Manganite-based Heterostructures ». Crystals 9, no 10 (22 septembre 2019) : 489. http://dx.doi.org/10.3390/cryst9100489.

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Transition metal functional oxides, e.g., perovskite manganites, with strong electron, spin and lattice correlations, are well-known for different phase transitions and field-induced colossal effects at the phase transition. Recently, the interfaces between dissimilar perovskites were shown to be a promising concept for the search of emerging phases with novel functionalities. We demonstrate that the properties of manganite films are effectively controlled by low dimensional emerging phases at intrinsic and extrinsic interfaces and appeared as a result of symmetry breaking. The examples include correlated Jahn–Teller polarons in the phase-separated (La1−yPry)0.7Ca0.3MnO3, electron-rich Jahn–Teller-distorted surface or “dead” layer in La0.7Sr0.3MnO3, electric-field-induced healing of “dead” layer as an origin of resistance switching effect, and high-TC ferromagnetic emerging phase at the SrMnO3/LaMnO3 interface in superlattices. These 2D polaronic phases with short-range electron, spin, and lattice reconstructions could be extremely sensitive to external fields, thus, providing a rational explanation of colossal effects in perovskite manganites.
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