Growth and characterization of strontium-substituted Ca<sub>2</sub>Al<sub>2</sub>SiO<sub>7</sub> piezoelectric single crystals

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  • TAKEDA Hiroaki
    School of Materials and Chemical Technology, Tokyo Institute of Technology
  • YOSHIDA Kyohei
    School of Materials and Chemical Technology, Tokyo Institute of Technology
  • OKUDERA Hiroki
    Graduate School of Natural Science and Technology, Kanazawa University
  • LEBBOU Kheirreddine
    Institut Lumière Matière, UMR5306 CNRS, Universite de Lyon 1
  • HOSHINA Takuya
    School of Materials and Chemical Technology, Tokyo Institute of Technology
  • TSURUMI Takaaki
    School of Materials and Chemical Technology, Tokyo Institute of Technology

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  • Growth and characterization of strontium-substituted Ca2Al2SiO7 piezoelectric single crystals

Abstract

We report the effect of Sr substitution on the structural, electrical, and mechanical properties of Ca2Al2SiO7 (CAS) piezoelectric single crystals for high-temperature pressure sensors. Single crystals of Sr-substituted CAS (Sr-CAS) with a nominal chemical composition of CaSrAl2SiO7 were grown by using the Czochralski technique. The single-crystal X-ray structure analysis revealed that Sr atoms were placed in the Ca decahedral sites, which decreased the polyhedral distortion slightly. The piezoelectric modulus d′31 and electrical resistivity of Sr-CAS measured at 23°C were slightly lower than those of CAS, but still sufficient for the satisfactory performance of the produced sensors. The rupture strength of the Sr-CAS crystal was 230 MPa, 1.2 times higher than that of a CAS crystal. The obtained results suggest that Sr-CAS crystals can be candidate materials for high-temperature pressure sensors.

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