A5049516504- X-ray Diffraction in Crystallography
- Nuclear materials and radiation effects
- Advanced ceramic materials synthesis
- Crystal Structures and Properties
- Advanced Condensed Matter Physics
- Inorganic Chemistry and Materials
- Ferroelectric and Piezoelectric Materials
- Glass properties and applications
- Concrete and Cement Materials Research
- Luminescence Properties of Advanced Materials
- Crystallization and Solubility Studies
- MXene and MAX Phase Materials
- Magnetic and transport properties of perovskites and related materials
- Microwave Dielectric Ceramics Synthesis
- Boron and Carbon Nanomaterials Research
- Multiferroics and related materials
- Electronic and Structural Properties of Oxides
- Recycling and utilization of industrial and municipal waste in materials production
- Clay minerals and soil interactions
- Advancements in Solid Oxide Fuel Cells
- Intermetallics and Advanced Alloy Properties
- Thermal Expansion and Ionic Conductivity
- Chemical Synthesis and Characterization
- Bauxite Residue and Utilization
- Metallurgical Processes and Thermodynamics
Nagoya Institute of Technology
2015-2024
Shimane Institute for Industrial Technology
2021
Graduate School USA
2018
Osaka Prefecture University
2017
Japan Fine Ceramics Center
2016
Max Planck Institute for Solid State Research
2016
National Institute for Materials Science
2016
Institut de Recherche sur les Céramiques
2009
Université de Limoges
2009
Centre National de la Recherche Scientifique
2009
Apatite-type lanthanum silicates of general formula La9.33+2x/3(SiO4)6O2+x have appeared recently as a new promising class oxide ion conductors with potential applications electrolytes for solid fuel cells (SOFCs). They been shown to demonstrate relatively high conductivity at moderate temperatures well low oxygen partial pressures. In this paper, the diffusion pathways and conduction mechanism ions in these phases are reinvestigated. This is done by means atomic scale computer modeling...
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...
We have successfully synthesized the highly c-axis-oriented polycrystals of apatite-type lanthanum silicate by reactive diffusion technique. When La2SiO5/La2Si2O7 couples were isothermally heated at 1773–1873 K for 5–100 h, apatite readily produced in form a layer interfacial boundaries. The annealed characterized using optical microscopy, micro-Raman spectroscopy, X-ray diffractometry, and electron probe microanalysis. product layers composed prismatic crystallites, with their elongation...
Overbonding of the channel oxygens in apatite-type lanthanum silicates was found to be a key for high oxide-ion conductivities by present single-crystal neutron and X-ray diffraction studies.
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 crystal structure of Zr 2 Al 3 C 4 was refined by the Rietveld method from conventional X‐ray powder diffraction data. hexagonal (space group P 6 mc , Z =2) with a =0.334680(6) nm, c =2.22394(3) and V =0.215731(6) nm being isomorphous that U . final reliability indices were R wp =8.57%, p =6.06%, S =1.32. showed an intergrowth NaCl‐type ZrC slabs separated ‐type layers.
Sub-milliampere operation was realised in 1.55 µm wavelength high index-coupled buried heterostructure distributed feedback (BH-DFB) lasers consisting of deeply etched double-quantum-well wirelike active regions. A threshold current Ith as low 0.7 mA and an external differential quantum efficiency 23%/facet were obtained for a cavity length 200 with cleaved facets stripe width 2.3 µm.
The crystal structure of La 2 SiO 5 was refined from laboratory X-ray powder diffraction data (CuK α 1 ) using the Rietveld method. is monoclinic (space group P ∕ c , Z =4) with lattice dimensions a =0.93320(2) nm, b =0.75088(1) =0.70332(1) β =108.679(1)°, and V =0.46687(1) nm 3 . final reliability indices were R wp =7.14%, =5.52%, B =3.83%. There are two sites in structural model, La1 La2. ninefold coordinated to oxygen, forming tricapped trigonal prism mean La1-O distance 0.263 nm. La2O 7...
Crystals of δ‐Y 2 Si O 7 (space group P 12 1 / c 1) were examined using high‐temperature powder X‐ray diffractometry to determine their unit‐cell dimensions from 296 1473 K. The lattice deformation induced by thermal expansion was investigated matrix algebra analysis the directions and magnitudes principal distortions (Λ i , = 1,2, 3). Λ 3 defined acute angle which linearly decreased 5(2)° —5.5(3)° with increased temperature 504 ‐axis invariably coincided crystallographic b ‐axis. steadily...
The crystal structure of YAl 3 C was refined from laboratory X‐ray powder diffraction data (Cu K α 1 ) using the Rietveld method. is hexagonal (space group P 6 mc , Z =2) with lattice dimensions a =0.342157(4) nm, c =1.72820(1) and V =0.175217(3) nm . final reliability indices were R wp =9.94% ( / e =1.18), p =7.36%, B =1.77%, F =1.03%. compound shows an intergrowth electroconductive [YC 2 ] thin slabs separated by Al 4 ‐type [AlC] layers. This material had thermoelectric properties superior...