Using a piezoelectric single crystal having a piezoelectric performance to high temperature, it has been developed combustion pressure sensor for measuring the combustion pressure of the internal combustion engine directly. In this paper, the measurement of the compressive strength of Ca2Al2SiO7 (CAS), one of the piezoelectric single crystal of a candidates for the combustion pressure sensor, and we confirmed the compressive strength improvement by element substitution of Ca to Sr, SrCaAl2SiO7 (SrCAS).
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