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Crystals 2019, 9(1), 11;

Thermal Expansion and Electro-Elastic Features of Ba2TiSi2O8 High Temperature Piezoelectric Crystal

State Key Laboratory of Crystal Materials, Advanced Research Center for Optics, Shandong University, Jinan 250100, China
Institute for Superconducting and Electronic Materials, Australia Institute of Innovative Materials, University of Wollongong, Wollongong, NSW 2500, Australia
Author to whom correspondence should be addressed.
Received: 7 December 2018 / Revised: 18 December 2018 / Accepted: 21 December 2018 / Published: 24 December 2018
(This article belongs to the Section Crystalline Materials)
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A high-quality Ba2TiSi2O8 (BTS) single crystal was grown using the Czochralski (Cz) pulling method. The thermal expansion and electro-elastic properties of BTS crystal were studied for high temperature sensor applications. The relative dielectric permittivities ε 11 T / ε 0 and ε 33 T / ε 0 were determined to be 16.3 and 11.8, while the piezoelectric coefficients d15, d31, d33 were found to be 17.8, 2.9, and 4.0 pC/N, respectively. Temperature dependence of electro-elastic properties were investigated, where the variation of elastic compliance s 55 E (= s 44 E ) was found to be <6% over temperature range of 20–700 °C. Taking advantage of the anisotropic thermal expansion, linear thermal expansion comparable to insulating alumina ceramic was achieved over temperature range up to 650 °C. The optimum crystal cut with large effective piezoelectric coefficient (>8.5 pC/N) and linear thermal expansion coefficient (8.03 ppm/°C) achieved for BTS crystal along the (47°, φ) direction (φ is arbitrary in 0–360°), together with its good temperature stability up to 650 °C, make BTS crystal a promising candidate for high temperature piezoelectric sensors. View Full-Text
Keywords: crystal growth; piezoelectricity; thermal expansion crystal growth; piezoelectricity; thermal expansion

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Jiang, C.; Chen, F.; Yu, F.; Tian, S.; Cheng, X.; Zhang, S.; Zhao, X. Thermal Expansion and Electro-Elastic Features of Ba2TiSi2O8 High Temperature Piezoelectric Crystal. Crystals 2019, 9, 11.

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