Local Environment

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Tomoyuki Yamamoto - One of the best experts on this subject based on the ideXlab platform.

  • Local Environment analysis of fe ions in bamgsio4
    FRONTIERS IN MATERIALS SCIENCE (FMS2015): Proceedings of the 2nd International Symposium on Frontiers in Materials Science, 2016
    Co-Authors: Junya Kase, Hidenobu Murata, Yoshihiro Shingaki, Yuta Inaba, Kazune Meguro, Toshihiro Okajima, Tomoyuki Yamamoto
    Abstract:

    Polycrystalline Fe-doped BaMgSiO4 is synthesized by the conventional solid state reaction method, which shows strong photochromism. Photochromic property of the synthesized specimens is investigated by measuring the diffuse reflectance spectrum. Local Environment of doped Fe ions in BaMgSiO4 has been studied by the analysis of the X-ray absorption near-edge structure (XANES) spectrum with the aid of the first-principles calculations.

  • Local Environment of silicon in cubic boron nitride
    Journal of Applied Physics, 2013
    Co-Authors: Hidenobu Murata, Fumiyasu Oba, Tomoyuki Yamamoto, Takashi Taniguchi, Shunichi Hishita, Isao Tanaka
    Abstract:

    Si-doped cubic boron nitride (c-BN) is synthesized at high pressure and high temperature, and the Local Environment of Si is investigated using X-ray absorption near edge structure (XANES) and first-principles calculations. Si-K XANES indicates that Si in c-BN is surrounded by four nitrogen atoms. According to first-principles calculations, the model for substitutional Si at the B site well reproduces experimental Si-K XANES, and it is energetically more favorable than substitutional Si at the N site. Both the present experimental and theoretical results indicate that Si in c-BN prefers the B site to the N site.

  • analysis of Local Environment of fe ions in hexagonal batio3
    Japanese Journal of Applied Physics, 2010
    Co-Authors: Shunsuke Chikada, Kazuyuki Hirose, Tomoyuki Yamamoto
    Abstract:

    Fe-doped hexagonal-structured BaTiO3 is synthesized by the conventional solid-state reaction method. The Local Environment of the Fe ions doped in the synthesized hexagonal BaTiO3 is then investigated by X-ray absorption near edge structure (XANES) measurements and first-principles calculations. It is confirmed from the Fe L2,3-edge XANES spectrum that the charge state of the Fe ions in the synthesized specimen is trivalent. By analyzing the Fe K-edge XANES spectrum of the present specimen with the aid of the first-principles calculations, it is found that doped Fe ions are substituted at the Ti site in Ti2O9 groups of face-sharing octahedra in hexagonal BaTiO3.

  • Local Environment of mn dopant in zno by near edge x ray absorption fine structure analysis
    Applied Physics Letters, 2005
    Co-Authors: Masahiro Kunisu, Fumiyasu Oba, Hidekazu Ikeno, Isao Tanaka, Tomoyuki Yamamoto
    Abstract:

    High-resolution near-edge x-ray absorption fine structure (NEXAFS) at MnK edge is employed to probe the Local Environment of Mn dopant in ZnO. First-principles supercell calculations are systematically made to obtain theoretical NEXAFS. Mn is found to substitute for Zn up to 5at.%Mn in polycrystalline samples sintered at 1623K in air. Presence of Mn3O4 is apparent for samples with higher Mn content. The NEXAFS does not change in the range of Mn concentration from 0.01 to 5at.%, indicating the absence of Mn precipitates. The results are confirmed by examining the polarization dependence of the NEXAFS for a 5at.%-doped ZnO thin film.

Isao Tanaka - One of the best experts on this subject based on the ideXlab platform.

  • Local Environment of silicon in cubic boron nitride
    Journal of Applied Physics, 2013
    Co-Authors: Hidenobu Murata, Fumiyasu Oba, Tomoyuki Yamamoto, Takashi Taniguchi, Shunichi Hishita, Isao Tanaka
    Abstract:

    Si-doped cubic boron nitride (c-BN) is synthesized at high pressure and high temperature, and the Local Environment of Si is investigated using X-ray absorption near edge structure (XANES) and first-principles calculations. Si-K XANES indicates that Si in c-BN is surrounded by four nitrogen atoms. According to first-principles calculations, the model for substitutional Si at the B site well reproduces experimental Si-K XANES, and it is energetically more favorable than substitutional Si at the N site. Both the present experimental and theoretical results indicate that Si in c-BN prefers the B site to the N site.

  • Local Environment of mn dopant in zno by near edge x ray absorption fine structure analysis
    Applied Physics Letters, 2005
    Co-Authors: Masahiro Kunisu, Fumiyasu Oba, Hidekazu Ikeno, Isao Tanaka, Tomoyuki Yamamoto
    Abstract:

    High-resolution near-edge x-ray absorption fine structure (NEXAFS) at MnK edge is employed to probe the Local Environment of Mn dopant in ZnO. First-principles supercell calculations are systematically made to obtain theoretical NEXAFS. Mn is found to substitute for Zn up to 5at.%Mn in polycrystalline samples sintered at 1623K in air. Presence of Mn3O4 is apparent for samples with higher Mn content. The NEXAFS does not change in the range of Mn concentration from 0.01 to 5at.%, indicating the absence of Mn precipitates. The results are confirmed by examining the polarization dependence of the NEXAFS for a 5at.%-doped ZnO thin film.

Toshimi Shimizu - One of the best experts on this subject based on the ideXlab platform.

  • Local Environment and property of water inside the hollow cylinder of a lipid nanotube
    Langmuir, 2005
    Co-Authors: Kana Koyama, Tsuguo Sawada, George John, Bo Yang, Mitsutoshi Masuda, Toshimi Shimizu
    Abstract:

    We investigated the Local Environment of water confined inside the hollow cylinder of lipid nanotubes (LNTs) by time-resolved fluorescent measurements and attenuated-total-reflectance infrared (ATR-IR) spectroscopy. The LNT was obtained by self-assembly of cardanyl glucosides in water at room temperature and had an open-ended cylindrical nanospace with a diameter of 10−15 nm, a length of 10−100 μm, and hydrophilic inner and outer surfaces. We introduced a fluorescent probe of 8-anilinonaphthalene-1-sulfonate into the confined water and observed an extremely slow dynamic Stokes shift with a correlation time of 1.26 ns, which was 2−3 orders of magnitude longer than that of bulk-phase water. From the peak shift of the fluorescent spectrum, the Local solvent polarity (ET(30)) of the confined water was estimated as 50 kcal/mol, which is 20% lower than that in bulk water. ATR-IR measurements showed that the hydrogen-bond network of water inside the LNT was more developed than that in bulk water at room temperat...

Jonathan Dw Clarke - One of the best experts on this subject based on the ideXlab platform.

  • Developmental time rather than Local Environment regulates the schedule of epithelial polarization in the zebrafish neural rod
    Neural Development, 2013
    Co-Authors: Gemma C Girdler, Claudio Araya, Jonathan Dw Clarke
    Abstract:

    Background Morphogenesis requires developmental processes to occur both at the right time and in the right place. During neural tube formation in the zebrafish embryo, the generation of the apical specializations of the lumen must occur in the center of the neural rod after the neural cells have undergone convergence, invagination and interdigitation across the midline. How this coordination is achieved is uncertain. One possibility is that Environmental signaling at the midline of the neural rod controls the schedule of apical polarization. Alternatively, polarization could be regulated by a timing mechanism and then independent morphogenetic processes ensure the cells are in the correct spatial location. Results Ectopic transplantation demonstrates the Local Environment of the neural midline is not required for neural cell polarization. Neural cells can self-organize into epithelial cysts in ectopic locations in the embryo and also in three-dimensional gel cultures. Heterochronic transplants demonstrate that the schedule of polarization and the specialized cell divisions characteristic of the neural rod are more strongly regulated by time than Local Environmental signals. The cells’ schedule for polarization is set prior to gastrulation, is stable through several rounds of cell division and appears independent of the morphogenetic movements of gastrulation and neurulation. Conclusions Time rather than Local Environment regulates the schedule of epithelial polarization in zebrafish neural rod.

Fumiyasu Oba - One of the best experts on this subject based on the ideXlab platform.

  • Local Environment of silicon in cubic boron nitride
    Journal of Applied Physics, 2013
    Co-Authors: Hidenobu Murata, Fumiyasu Oba, Tomoyuki Yamamoto, Takashi Taniguchi, Shunichi Hishita, Isao Tanaka
    Abstract:

    Si-doped cubic boron nitride (c-BN) is synthesized at high pressure and high temperature, and the Local Environment of Si is investigated using X-ray absorption near edge structure (XANES) and first-principles calculations. Si-K XANES indicates that Si in c-BN is surrounded by four nitrogen atoms. According to first-principles calculations, the model for substitutional Si at the B site well reproduces experimental Si-K XANES, and it is energetically more favorable than substitutional Si at the N site. Both the present experimental and theoretical results indicate that Si in c-BN prefers the B site to the N site.

  • Local Environment of mn dopant in zno by near edge x ray absorption fine structure analysis
    Applied Physics Letters, 2005
    Co-Authors: Masahiro Kunisu, Fumiyasu Oba, Hidekazu Ikeno, Isao Tanaka, Tomoyuki Yamamoto
    Abstract:

    High-resolution near-edge x-ray absorption fine structure (NEXAFS) at MnK edge is employed to probe the Local Environment of Mn dopant in ZnO. First-principles supercell calculations are systematically made to obtain theoretical NEXAFS. Mn is found to substitute for Zn up to 5at.%Mn in polycrystalline samples sintered at 1623K in air. Presence of Mn3O4 is apparent for samples with higher Mn content. The NEXAFS does not change in the range of Mn concentration from 0.01 to 5at.%, indicating the absence of Mn precipitates. The results are confirmed by examining the polarization dependence of the NEXAFS for a 5at.%-doped ZnO thin film.