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Growth and characterization of Ca(2-x)Ae(x)Al(2)SiO(7) (Ae = Sr, Ba) piezoelectric single crystals

Abstract : We report the effects of Sr or Ba substitution on the crystal growth and electrical and mechanical properties of Ca2Al2SiO7 (CAS) piezoelectric single crystals, which are suitable for use in high-temperature pressure sensors. Ba was scarcely incorporated in the crystal lattice of CAS. Strontium-substituted CAS single crystal with a nominal chemical composition Ca0.75Sr1.25Al2SiO7 (CSAS125) was grown by the Czochralski method. Although the piezoelectric modulus d′31 of CSAS125 is a bit lower than that of the CAS crystal, the rupture strength of the (XYt)45° rotation cut substrate of CSAS125 crystal was 170 MPa, which was 1.2 times higher than that of CAS crystal. By considering the rupture strength and the apparent piezoelectric d*31 coefficient calculated for the crystal rotation cut of CAS crystal, the CSAS125 crystal substrate with a rotation cut of (XYt)25° was found to indicate a rupture strength of 220 MPa and a piezoelectric d′31 coefficient of approximately 2 pC/N.
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https://hal-univ-lyon1.archives-ouvertes.fr/hal-02290272
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Submitted on : Tuesday, September 17, 2019 - 3:13:50 PM
Last modification on : Thursday, October 15, 2020 - 8:54:04 AM

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T. Oshima, T. Hoshina, T. Tsurumi, Kheirreddine Lebbou, H. Takeda. Growth and characterization of Ca(2-x)Ae(x)Al(2)SiO(7) (Ae = Sr, Ba) piezoelectric single crystals. Journal of the Ceramic Society of Japan, Ceramic Society of Japan, 2018, 126, pp.300-305. ⟨10.2109/jcersj2.17263⟩. ⟨hal-02290272⟩

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