Growth and characterization of strontium-substituted La<sub>3</sub>Ta<sub>0.5</sub>Ga<sub>5.5</sub>O<sub>14</sub> single crystals

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  • TAKEDA Hiroaki
    Graduate School of Science and Engineering, Saitama University
  • SOBATA Yudai
    Graduate School of Science and Engineering, Saitama University
  • USUI Haruki
    School of Materials and Chemical Technology, Tokyo Institute of Technology
  • KODAMA Shohei
    Graduate School of Science and Engineering, Saitama University
  • YANASE Ikuo
    Graduate School of Science and Engineering, Saitama University
  • HOSHINA Takuya
    School of Materials and Chemical Technology, Tokyo Institute of Technology
  • TSURUMI Takaaki
    School of Materials and Chemical Technology, Tokyo Institute of Technology
  • SHIMAMURA Kiyoshi
    National Institute for Materials Science

Abstract

<p>The effects of strontium substitution on the electrical properties of La3Ta0.5Ga5.5O14 (LTG) are reported. Strontium substituted LTG (Sr-LTG) with a nominal chemical composition La2.9Sr0.1Ta0.55Ga5.45O14 crystals were grown using the conventional Czochralski method under high and low oxygen partial pressures. The electrical properties and thermal behaviors of the Sr-LTG crystals were also compared with those of pure crystals. Sr substitution was found to affect the electroacoustic constants and thermal expansion coefficient clearly. These characteristics are discussed from crystallographic perspectives. The Sr-LTG crystals grown at low oxygen partial pressures exhibited higher electrical resistivity ρ for pressure sensors used at high temperatures.</p>

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