A5070420201- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Ferroelectric and Piezoelectric Materials
- Nuclear materials and radiation effects
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Microwave Dielectric Ceramics Synthesis
- Crystal Structures and Properties
- Luminescence Properties of Advanced Materials
- Iron-based superconductors research
- Inorganic Chemistry and Materials
- Thermal Expansion and Ionic Conductivity
- Advancements in Solid Oxide Fuel Cells
- Machine Learning in Materials Science
- Magnetic Properties and Synthesis of Ferrites
- Rare-earth and actinide compounds
- Advanced ceramic materials synthesis
- Physics of Superconductivity and Magnetism
- Glass properties and applications
- Crystallography and Radiation Phenomena
- Boron and Carbon Nanomaterials Research
- Acoustic Wave Resonator Technologies
- High-pressure geophysics and materials
Nagoya Institute of Technology
2016-2025
Advanced Ceramics Manufacturing (United States)
2025
Murata (Japan)
2021
The University of Tokyo
2021
Tokyo University of Science
2021
Max Planck Institute for Solid State Research
2016
National Institute for Materials Science
2016
Japan Fine Ceramics Center
2016
We investigated the crystallographic structure of FePS3 with a layered using transmission electron microscopy and powder X-ray diffraction. found that forms rotational twin common axis along c*-axis. The high-resolution images revealed boundaries were positioned at van der Waals gaps between layers. narrow bands dark contrast observed in bright-field below antiferromagnetic transition temperature, TN ≈ 120 K. Low-temperature diffraction showed lattice distortion; a- b-axes shortened...
Abstract Aerosol deposition (AD) is a room‐temperature film method for the fabrication of scalable ferroelectric ceramic films on different substrates, which particularly appealing thick energy storage applications. However, electrical and mechanical properties AD are not yet satisfactorily understood. Here, we report dielectric, storage, aerosol‐deposited BaTiO 3 (AD‐BT) with nanosized grains by combining macroscopic electric measurements indentation tests. We find that thermal annealing an...
We have prepared the highly c-axis-oriented polycrystalline material of apatite-type La9.50Si6O26.25 by isothermal heating sandwich-type La2SiO5/La2Si2O7/La2SiO5 diffusion couple at 1873 K for 50 h. The resulting polycrystal was characterized using optical microscopy, X-ray diffractometry, and impedance spectroscopy. annealed mechanically processed, thin-plate electrolyte consisting textured obtained. oxide-ion conductivity along c-axis steadily increased from 2.0 × 10–2 S/cm to 7.9 with...
We investigated the crystal structure and ferroelectric domains of Bi4Ti3O12 (BTO) by means transmission electron microscopy (TEM) single-crystal X-ray diffractometry. From extinction rule, we determined that space group in phase BTO is P1a1 rather than B2cb B1a1 which have been proposed previously. successfully refined based on P1a1. The 180° 90° domain structures were observed [001]-zone dark-field TEM imaging. In structure, one component polarization vector parallel to a-axis. An annular...
The A-site cation-ordered Ruddlesden-Popper compound Gd3Ba2Fe4O12.5 was synthesized using the topotactic chemical reaction of Gd3Ba2Fe4O12. crystal structure determined through single-crystal X-ray diffraction and scanning transmission electron microscopy. crystallizes in a tetragonal unit cell with P42/mnm symmetry, where = 5.57240(10) Å c 35.3289(8) Å, differing from P42/ncm space group topotactically introduced oxide ions randomly occupy half atomic sites on central layer (Gd layer)...
The oxide-ion conductivity was successfully improved for the apatite-type lanthanum silicate polycrystal by combining beneficial use of germanium doping and texturing methods. We synthesized highly c-axis-oriented polycrystalline material La9.33(Si0.87Ge0.13)6O26 isothermal heating sandwich-type La2Si2O7/La2(Si0.833Ge0.167)O5/La2Si2O7 diffusion couples at 1873 K 50 h. resulting subsequently characterized using optical microscopy, micro-Raman spectroscopy, X-ray diffractometry, impedance...
We performed X-ray fluorescence holography measurements on a Pb(Fe1/2Nb1/2)O3 (PFN) multiferroic material in order to investigate the temperature dependence of three dimensional local structure around Fe atoms. It was found that atomic image intensity nearest neighbor Pb atom abruptly decreases when becomes lower than Néel (TN) about 150 K, while at Fe/Nb position remains almost unchanged. These observations show magnetic transition TN induces static positional shifts atoms but does not...
Recent advances in "hybrid-improper" ferroelectricity Dion-Jacobson (DJ)-type layered perovskites have caused renewed interest the search for new ferroelectrics. Here, we present an approach tailored synthesis of a homologous series DJ-type Cs(Bi
Ce1-xPrxOBiS2 (0.1 ≤ x 0.9) single crystals were grown using a CsCl flux method. Their structural and physical properties examined by X-ray diffraction, absorption, transmission electron microscopy, electrical resistivity. All of the with 0.1 0.9 exhibited tetragonal phase. With increasing Pr content, a-axis c-axis lattice parameters decreased increased, respectively. Transmission microscope analysis Ce0.1Pr0.9OBiS2 (x = crystal showed no stacking faults. Atomic-resolution energy dispersive...
Ferrochiral transition, i.e., a transition involving an emergence of chirality, provides unique opportunity to achieve nonvolatile reversible control chirality with external fields. However, materials showing pure ferrochiral transitions, which are accompanied by no other types ferroic exceedingly rare. In this study, we propose that is achieved combination antipolar and antiferroaxial orderings structural units, substantiate proposal through study the chiral compound Ba(TiO)Cu4(PO4)4....
The crystal structure of the spin dimer magnet NaCu2VP2O10 was determined using single-crystal X-ray diffraction and electron diffraction. displayed a non-centrosymmetric orthorhombic C2221 with = 6.13860 (10) Å, b 14.4846 (3) Å c 8.2392 (2) Å. layered comprised CuO4 plaquettes, VO6 octahedra PO4 tetrahedra. A pair plaquettes formed Cu2O6 structural dimers through edge sharing. Cu-Cu network distorted puckered-layer pseudo-one-dimensional characteristics. Maximum magnetic susceptibility...
The crystal structure and the magnetoelectric (ME) effect were investigated in highly c-axis oriented polycrystalline samples of Y-type hexaferrite, BaSrCo2Fe11AlO22, fabricated using a rotating magnetic field. A detailed was determined combination scanning transmission electron microscopy single x-ray diffraction. It revealed that Co Al ions, which play important roles performance ME effect, reside mainly on Fe site S block hexaferrite. In samples, electric polarization induced by applying...
X-ray fluorescence holography (XFH) measurements were carried out for multiferroic $\mathrm{Pb}({\mathrm{Fe}}_{1/2}{\mathrm{Nb}}_{1/2}){\mathrm{O}}_{3}$ (PFN) single crystal to investigate variations in the local structures around Nb ions with decreasing temperature from 300 100 K, combination single-crystal x-ray diffraction (XRD) experiments. We find that Nb--Pb correlation is more significantly changed by cooling than average structure derived XRD experiments, indicating a mobile feature...
A charge order-driven ferroelectricity, a novel mechanism completely different from conventional types such as lattice distortion observed in typical ferroelectric, has been expected for series of compounds $R{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$ ($R=\mathrm{Ho}\ensuremath{\sim}\mathrm{Lu}$ and Y, In), but real problem still unsolved whether or not the are truly ferroelectric. Here, we demonstrate that $\mathrm{Tm}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$, one family, is true ferroelectric...
We investigated the correlation between crystal structures and spin states of cobalt perovskites ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Pr}}_{x}{\mathrm{CoO}}_{3}$ $(x=0.30, 0.34)$ by x-ray powder diffraction, transmission electron microscopy, magnetic measurements at low temperatures. The $x=0.30$ $x=0.34$ compounds exhibit structural phase transitions a low-temperature orthorhombic (Pbnm) high-temperature rhombohedral $(R\overline{3}c)$ around 170 250 K, respectively. In fairly wide...
Based on the bond valence (BV) energy landscape method, we have revealed potential to conduct La3+ in cuspidine-type compound La4Ga2O9 (space group P21/c) along a-axis direction and demonstrated conduction species be with transference number of 0.992. The bulk conductivity (σbulk) random grain-oriented polycrystal steadily increased from 1.05 × 10–7 1.11 10–4 S cm–1 increasing temperature 623 1073 K, activation 0.94 eV. In range 623–973 σbulkvalues were superior those La1/3Zr2(PO4)3, a...
Nitride (N3–) or cyanamide (CN22–) based mixed-anion compounds stand as attractive materials due to their unique properties derived from the binary multiple anions, although synthesis remains challenging in incorporating N3– CN22– anions safely. This work highlights first demonstration of situ single phase formation a LaCl(CN2) compound stable source precursor, melamine modified with LaCl3 preparable under aqueous conditions. The involves chemical modification form complex. Upon heating...