A5087574849- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Multiferroics and related materials
- Crystallization and Solubility Studies
- Thermal Expansion and Ionic Conductivity
- Ferroelectric and Piezoelectric Materials
- X-ray Diffraction in Crystallography
- Physics of Superconductivity and Magnetism
- Advanced Fiber Optic Sensors
- Ionic liquids properties and applications
- Fuel Cells and Related Materials
- Gas Sensing Nanomaterials and Sensors
- Advanced Battery Technologies Research
- Magneto-Optical Properties and Applications
- Advanced Thermoelectric Materials and Devices
- Shape Memory Alloy Transformations
- Transition Metal Oxide Nanomaterials
- Photonic and Optical Devices
- Perovskite Materials and Applications
- Carbon Dioxide Capture Technologies
- Advancements in Battery Materials
- Magnetic Properties of Alloys
- Magnetic Properties and Synthesis of Ferrites
- Extraction and Separation Processes
- Metal-Organic Frameworks: Synthesis and Applications
Chinese Academy of Sciences
2023-2025
China Spallation Neutron Source
2023-2025
Spallation Neutron Source
2023-2025
Institute of High Energy Physics
2023-2024
Kyoto Bunkyo University
2018-2023
Kyoto University
2018-2023
Kyoto University Institute for Chemical Research
2018-2023
South China University of Technology
2016
Cation distribution in transition-metal oxides is closely tied to their physical properties. Here we employed resonant x-ray-diffraction technique and quantitatively evaluated the cation inverse spinel $\mathrm{NiC}{\mathrm{o}}_{2}{\mathrm{O}}_{4}$ films that were epitaxially grown by pulsed laser deposition. Our results reveal oxygen partial pressure during growth ${P}_{\mathrm{O}2}$ a key parameter determining films, with larger leading an increase Ni concentration occupying octahedral...
Abstract Materials which show novel thermal properties can be used to make highly efficient and environmentally friendly energy systems for storage refrigeration through caloric effects. An A ‐site‐ordered quadruple perovskite‐structure oxide, NdCu 3 Fe 4 O 12 , is found release significant latent heat, 25.5 kJ kg −1 (157 J cc ), at the intersite‐charge‐transfer transition temperature near room temperature. The first‐order accompanied by an unusual magnetic ordering a large...
Structure-property relations of Ag<sub>2-3x</sub>Bi<italic>x</italic>I<sub>2</sub> have been revealed.
In the quest to find quantum spin liquids, layered cobalt oxides ${\mathrm{Na}}_{2}{\mathrm{Co}}_{2}{\mathrm{TeO}}_{6}$ and ${\mathrm{Na}}_{3}{\mathrm{Co}}_{2}{\mathrm{SbO}}_{6}$ have been proposed as promising candidates for approximating Kitaev honeycomb-lattice model. Yet, their suitability has thrown into question due observed long-range magnetic order at low temperatures indications of easy-plane, rather than Kitaev-type, anisotropy. Here, we use muon-spin relaxation reveal an...
A fully oxygenated hexagonal 12-layer perovskite $\mathrm{BaFe}{\mathrm{O}}_{3}$ with nominal $\mathrm{F}{\mathrm{e}}^{4+}$ was obtained by high-pressure synthesis. The structure consists of face-sharing $\mathrm{F}{\mathrm{e}}_{3}{\mathrm{O}}_{9}$ octahedral trimers and corner-sharing octahedra. remarkable series electronic transitions that relieve the instability are discovered on cooling;...
Abstract Caloric effects of solids can provide us with innovative refrigeration systems more efficient and environment-friendly than the widely-used conventional vapor-compression cooling systems. Exploring novel caloric materials is challenging but critically important in developing future technologies. Here we discovered that quadruple perovskite structure ferrimagnet BiCu 3 Cr 4 O 12 shows large multiple at first-order charge transition occurring around 190 K. Large latent heat...
Room-temperature multiferroism in polycrystalline antiferromagnetic Fe perovskites is reported for the first time. In perovskite-type oxides RE1.2Ba1.2Ca0.6Fe3O8 (RE = Gd, Tb), interplay of layered ordering Gd(Tb), Ba, and Ca atoms with FeO4-tetrahedra (T) FeO6-octahedra (O) results a polar crystal structure. The structure consists stacking sequence RE/Ca-RE/Ca-Ba-RE/Ca layers combination TOOT unit cell. A moment 33.0 μC/cm2 Gd-oxide (23.2 Tb one) determined from displacements cations,...
BaFe xNi1- xO3 with end members of BaNiO3 ( x = 0) and BaFeO3 1), which, respectively, adopt the 2H 6H hexagonal perovskite structures, were synthesized, their crystal structures investigated. A new single phase, Ba4Fe3NiO12 0.75), that adopts 12R structure space group R3̅ m a 5.66564(7) Å c 27.8416(3) Å), was found to be stabilized. Mössbauer spectroscopy results analysis using synchrotron neutron powder diffraction data revealed nominal Fe3+ occupies corner-sharing octahedral site while...
Solventless mechanochemical synthesis by manual grinding was applied to grow organic proton conducting salts, imidazole-succinic acid (C3H4N2-HOOC(CH2)2COOH) and imidazole-glutaric (C3H4N2-HOOC(CH2)3COOH). This method induces crystallization provides the phase-pure compounds. The compounds exhibit different electric behavior activation energies Ea compared with reported single crystals obtained from solution method. difference in property can be related intrinsic defects structural disorder...
Compositional tuning of magnetic properties to provide technologically useful results is in the forefront research complex oxides. Taking advantage highly sensitive nature magnetism 6H barium ruthenates (Ba3MRu2O9, M = transition metals or rare earth ions) composition, we have carried out M-site dual doping by 50% each Co and Mn. The high pressure temperature synthesized sample Ba3Co0.5Mn0.5Ru2O9 shows giant exchange bias (5.71 kOe at 5 K 50 cooling field) huge coercivity (9.42 K) low along...
In the quest to find quantum spin liquids, layered cobalt oxides Na2Co2TeO6 and Na3Co2SbO6 have been proposed as promising candidates for approximating Kitaev honeycomb model. Yet, their suitability has thrown into question due observed long-range magnetic order at low temperatures indications of easy-plane, rather than Kitaev-type, anisotropy. Here we use muon relaxation reveal an unexpected picture: contrary anticipated static nature order, systems show prevalent dynamics with spatially...
The ambient pressure cation disordered InVO3 bixbyite has been predicted to form a GdFeO3 -type perovskite phase under high and temperature. Contrary the expectation, was found crystallize in polar LiNbO3 structure with calculated spontaneous polarization as large 74 μC cm-2 . Antiferromagnetic coupling of V3+ magnetic moments cooperative ground state below about 10 K coupled suggest an intriguing novel high-pressure structure.
Two hexagonal-perovskite-structure oxides, 21R Ba7Fe5Ge2O20 and 12H Ba6Fe3Ge3O17, were obtained by synthesis with a high-pressure high-temperature technique. The Fe-containing units are sandwiched nonmagnetic GeO4 tetrahedral layers in the structures, thus both compounds show two-dimensional ferrimagnetic behaviors due to intra- interunit magnetic interactions. has ionic formula Ba7Fe123+Fe24+Fe324+Ge424+O20 at room temperature, unusually high valence Fe4+ trimers undergoes charge...
CdMnO3 had not been previously reported and was a missing piece in the A2+Mn4+O3 series. We succeeded synthesizing this compound by high-pressure method confirmed that it is crystallized distorted perovskite structure with Cd2+Mn4+O3 charge configuration. The obtained insulating exhibits an antiferromagnetic transition at about 86 K. First-principles calculations revealed Mn4+ (t2g3) spins form C-type structure, which sharp contrast to G-type antiferromagnetism isostructural isoelectronic...
In article number 2009476, Yuichi Shimakawa and co-workers present an A-site-ordered quadruple perovskite NdCu3Fe4O12 that releases significant latent heat at the intersite-charge-transfer transition temperature near room temperature. The is first-order accompanied by unusual magnetic ordering a large volume change, thus, it causes entropy which utilized through colossal barocaloric effect. Efficient refrigeration can be realized this
Zero thermal expansion (ZTE) materials are widely concerned for their potential applications. They have been found in some magnetic functional due to the magnetovolume effect (MVE), which is intimately associated with spontaneous ordering. Here, we report a novel MVE material, NdBaCo2O5.5+x, shows ZTE at low temperatures. With help of high-resolution neutron powder diffraction (NPD), underling mechanism NdBaCo2O5.5+x attributed an isostructural phase transition from large-volume (LV)...
Materials that show negative thermal expansion (NTE) have significant industrial merit because they can be used to fabricate composites whose dimensions remain invariant upon heating.In some materials, NTE is concomitant with the spontaneous magnetization due magnetovolume effect (MVE).Here we report a new class of MVE material; namely, an A-site ordered perovskite PrBaCo2O5.5+x(0 ≤ x 0.41), in which strong induced by hole doping [1].Through comprehensive study multiple probes, particular...
ABO3-type oxides exhibit various structures with different combinations of A-and B-site ions.Their can be empirically predicted by Goldschmidt's tolerance factor t, t = (rA+rO)/√2(rB+rO), where rA, rB, and rO are the radii A, B, oxygen ions, respectively [1].As shown in Figure 1, Ln 3+ V O3 (Ln: lanthanides) crystallizes GdFeO3-type distorted perovskite structure a factor, from 0.786 to 0.843 [2][3][4].While ScVO3 (t 0.744) bixbyite-type structure, which is described as (Sc0.5V0.5)2O3...