<i>In Situ</i> Synchrotron High-Pressure X-ray Analysis for ZnO with Rocksalt Structure

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  • Horita Zenji
    Graduate School of Engineering, Kyushu Institute of Technology Magnesium Research Center, Kumamoto University Synchrotron Light Application Center, Saga University
  • Tang Yongpeng
    Graduate School of Engineering, Kyushu Institute of Technology
  • Masuda Takahiro
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
  • Edalati Kaveh
    WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University
  • Higo Yuji
    Japan Synchrotron Radiation Research Institute

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Other Title
  • 岩塩構造ZnOの生成を目指したその場放射光高圧X線解析

Description

<p>Zinc oxide (ZnO) with a rocksalt crystal structure is attractive because of the bandgap which lies in the range of visible light absorption (1.2-2.6 eV). However, the rocksalt structure is not stable at ambient pressure and temperature according to an equilibrium phase diagram. Nevertheless, this study demonstrates, for the first time, that it is possible to realize a 100% fraction of the rocksalt structure at ambient pressure and temperature. ZnO powder is initially processed by severe plastic deformation under high pressure through a technique of high-pressure torsion (HPT). The HPT-processed ZnO is then examined using a high-pressure application system available at BL04B1 of SPring-8 and in situ X-ray diffraction (XRD) analysis is conducted under high pressures at elevated temperatures. It is shown that the initial presence of the rocksalt structure produced by the HPT process is effective to attain a 100% fraction of the rocksalt structure.</p>

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