A5041936528- Crystallography and Radiation Phenomena
- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- High-pressure geophysics and materials
- Nuclear Physics and Applications
- Nuclear materials and radiation effects
- Topological Materials and Phenomena
- Ferroelectric and Piezoelectric Materials
- X-ray Diffraction in Crystallography
- Electronic and Structural Properties of Oxides
- Multiferroics and related materials
- Surface and Thin Film Phenomena
- Advanced Battery Materials and Technologies
- Microstructure and mechanical properties
- Advancements in Battery Materials
- Surface Chemistry and Catalysis
- Advancements in Photolithography Techniques
- Advanced Thermoelectric Materials and Devices
- Iron-based superconductors research
- Glass properties and applications
- Particle Accelerators and Free-Electron Lasers
- Advanced X-ray and CT Imaging
- Advanced Condensed Matter Physics
Nagoya Institute of Technology
2016-2025
SPring-8
2022-2025
Japan Synchrotron Radiation Research Institute
2022-2025
Friedrich-Alexander-Universität Erlangen-Nürnberg
2024
Ibaraki University
2019-2022
Japan Proton Accelerator Research Complex
2020-2022
Hiroshima City University
2016-2022
Tohoku University
2007-2020
Unifor
2020
Nagoya University
2019
The atomic scale characterization of dopant atoms in semiconductor devices to establish correlations with the electrical activation these is essential advancement contemporary process technology. Spectro-photoelectron holography combined first-principles simulations can determine local three-dimensional structures elements, which turn affect their electronic states. In work reported herein, this technique was used examine arsenic (As) doped into a silicon (Si) crystal. As 3d core level...
X-ray fluorescence holography (XFH) was, for the first time, applied to a polycrystalline system in order visualize local structures within single grain using an x-ray microbeam. XFH was performed on (Ba,Ca)(Zr,Ti)O3 (BCZT) piezoelectric ceramic as normal mode with two-dimensional detector. After data acquisition and processing, we obtained Zr-Kα hologram from BCZT ceramic. The Kossel lines were clearly observed, which good agreement our simulated results, although there is possibility that...
In order to bridge experimental results for the atomic structure in mixed crystals between x-ray diffraction showing a Vegard's law and absorption fine spectroscopy indicating preservations of each Pauling's bond length, an fluorescence holography (XFH) experiment was carried out on ${\text{Zn}}_{0.4}{\text{Mn}}_{0.6}\text{Te}$ single crystal drawing three-dimensional image around Zn atom. The XFH intensities Te atoms with respect reference ZnTe are almost constant beyond five chemical bonds...
To evaluate local atomic structures around Co in high temperature diluted ferromagnetic semiconductor Co-doped TiO2, x-ray fluorescence holography and absorption fine structure experiments were carried out on rutile paramagnetic Ti0.99Co0.01O2 Ti0.95Co0.05O2 films. The atoms the simply substituted for Ti sites structure, whereas a suboxidic arrangement of CoO2Ti4 formed A theoretical investigation based series first-principles calculations indicated stability aggregated clusters supporting...
The local structures around Nb and Pb in the prototypical relaxor ferroelectric Pb(Mg${}_{1/3}$Nb${}_{2/3}$)O${}_{3}$ (PMN) were investigated by x-ray fluorescence holography. separate atomic images of nearest revealed acute obtuse rhombohedral crystal unit cells. Pb-Pb correlated showed a structure body-center-like $2{a}_{0}\ifmmode\times\else\texttimes\fi{}2{a}_{0}\ifmmode\times\else\texttimes\fi{}2{a}_{0}$ superlattice, proving rigid three-dimensional network structural model combining...
Atomic-resolution holography makes it possible to obtain the three-dimensional (3D) structure around a target atomic site. Translational symmetry of arrangement sample is not necessary, and 3D image can be measured when local site oriented. Therefore, structures such as dopants adsorbates are observable. Here, atomic-resolution comprising photoelectron holography, X-ray fluorescence neutron their inverse modes treated. Although measurement methods different, they handled with unified theory....
To clarify lattice distortions induced by adding Ga atoms in the InSb crystal, $K\ensuremath{\alpha}$ x-ray fluorescence holography (XFH) experiments were carried out on an In${}_{0.995}$Ga${}_{0.005}$Sb diluted mixed single and three-dimensional atomic images around reconstructed. Although are located almost at ideal positions of some differences can be observed for only first- second-neighboring atoms. By combining them with absorption fine structure data, large spatial fluctuations...
The structure of a ZnSnAs2 thin film epitaxially grown on an InP substrate was evaluated using x-ray fluorescence holography. reconstructed three-dimensional atomic images clearly show that the crystal is mainly sphalerite type, in contrast to bulk form. A large disordering As layers observed, whereas positions Zn/Sn atoms are relatively stable. analysis data indicates serve as buffer and relax strain caused by random occupation Zn Sn atoms. These results provide further understanding means...
We investigated the pressure dependence of electric transport and crystal structure Ag-doped $\mathrm{B}{\mathrm{i}}_{2}\mathrm{S}{\mathrm{e}}_{3}$. In sample prepared by Ag doping $\mathrm{B}{\mathrm{i}}_{2}\mathrm{S}{\mathrm{e}}_{3}$, Bi atom was partially replaced Ag, i.e., $\mathrm{A}{\mathrm{g}}_{0.05}\mathrm{B}{\mathrm{i}}_{1.95}\mathrm{S}{\mathrm{e}}_{3}$. X-ray diffraction patterns $\mathrm{A}{\mathrm{g}}_{0.05}\mathrm{B}{\mathrm{i}}_{1.95}\mathrm{S}{\mathrm{e}}_{3}$ measured at...
X-ray fluorescence holography (XFH) is an atomic structure determination technique that combines the capabilities of diffraction and spectroscopy. It provides a unique means gaining fully three-dimensional information about local lattice site positions selected elements inside compound samples. In this work, we discuss experimental theoretical aspects are essential for efficient recording analysis holograms review most recent advances in XFH. We describe experiments performed with brilliant...
In this study, the structural phase transitions are investigated as a function of composition and temperature for polycrystalline x(Ba0.7Ca0.3)TiO3-(1-x)Ba(Zr0.2Ti0.8)O3 (x = 0.40, 0.45, 0.50, 0.55, 0.60) through combination Raman spectroscopy, synchrotron X-ray diffraction, dielectric spectroscopy. The aim is to gain insight into complex boundary region responsible excellent electromechanical properties. results demonstrate correlation between local site substitutions based on...
The most widely used methods for reconstructing three-dimensional atomic arrangements from a photoelectron hologram and an x-ray fluorescence are based on integral kernel, example, the Fourier transformation. These require many holograms that recorded using multiple energies since transformation requires infinite interval. Therefore, it is difficult to reconstruct arrangement single-energy hologram. In order accomplish hologram, we have proposed scattering pattern extraction algorithm...
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTX-ray SpectrometryKouichi Tsuji*, Kazuhiko Nakano, Yoshio Takahashi, Kouichi Hayashi, and Chul-Un RoView Author Information Department of Applied Chemistry & Bioengineering, Graduate School Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan Earth Planetary Systems Science, Hiroshima Higashi-Hiroshima, 739-8526, Institute for Materials Research, Tohoku 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Chemistry, Inha...
Rare earth oxides are usually widegap insulators like Y2O3 with closed shell trivalent rare ions. In this study, solid phase rock salt structure yttrium monoxide, YO, unusual valence of Y2+ (4d1) was synthesized in a form epitaxial thin film by pulsed laser deposition method. YO has been recognized as gaseous previous studies. contrast Y2O3, dark-brown colored and narrow gap semiconductor. The tunable electrical conductivity ranging from 10−1 to 103 Ω−1 cm−1 attributed the presence oxygen...
Mixed-anion perovskites such as oxynitrides, oxyfluorides, and oxyhydrides have flexibility in their anion arrangements, which potentially enables functional material design based on coordination chemistry. However, difficulty the control of arrangement has prevented realization this concept. In study, we demonstrate strain engineering epitaxial thin films Ca1–xSrxTaO2N perovskite oxynitrides. Under compressive strain, axial sites TaO4N2 octahedra tend to be occupied by nitrogen rather than...
The x-ray fluorescence holography technique is applied to perovskite (Ba0.9Ca0.1)TiO3 ferroelectrics in order investigate the local structures around Ca and Ba ions at A-site. While A-site atomic images ion can be well understood based on BaTiO3 structure, those are located closer positions emitter. Furthermore, shape of image elongated radial direction. These features clearly show lattice contraction a significant displacement from ideal position. On basis detailed analysis position ion, it...
We used multiple energy x-ray holography (MEXH) to image the local atomic environment of Zn atoms doped in a GaAs wafer using synchrotron radiation and multielement solid-state detector. The obtained images revealed that occupied substitutional site. By comparison reconstructed 1.41 \AA{} above below emitter atom, suppression twin due MEXH was confirmed experimentally for certain atoms.
A method of internal-detector electron holography is the time-reversed version photoelectron holography. Using an energy-dispersive x-ray detector, gun, and a computer-controllable sample stage, we measured multiple-energy hologram atomic arrangement around Ti atom in ${\mathrm{SrTiO}}_{3}$ by recording characteristic $K\ensuremath{\alpha}$ spectra for different beam angles wavelengths. real-space image was obtained using fitting-based reconstruction algorithm. 3D images elements Sr, Ti, O...
Experimental procedure and setup for obtaining X-ray fluorescence hologram of crystalline metalloprotein samples are described. Human hemoglobin, an α2β2 tetrameric containing the Fe(II) heme active-site in each chain, was chosen this study because its wealth crystallographic data. A cold gas flow system introduced to reduce radiation damage protein crystals that usually fragile susceptible damage. χ-stage installed rotate sample while avoiding intersection between beam loop or holder, which...