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Crystals 2014, 4(2), 141-151; doi:10.3390/cryst4020141

Orientation and Temperature Dependence of Piezoelectric Properties for Sillenite-Type Bi12TiO20 and Bi12SiO20 Single Crystals

State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan 250100, Shandong, China
Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA
Authors to whom correspondence should be addressed.
Received: 30 April 2014 / Revised: 22 May 2014 / Accepted: 28 May 2014 / Published: 20 June 2014
(This article belongs to the Special Issue Piezoelectric Crystals)
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The full matrix of electro-elastic constants of sillenite-type crystals Bi12TiO20 (BTO) and Bi12SiO20 (BSO) were determined by the resonance method, with d14 and k14 being on the order of 40–48 pC/N and 31%–36%, respectively. In addition, double-rotated orientation dependence of d33 was investigated, with the maximum values of 25–28 pC/N being achieved in ZXtl45°/54°-cut samples. The electrical resistivity of BSO was found to be two orders higher than that of BTO, being on the order of 7 × 105 Ω cm at 500 °C. The temperature dependence of dielectric and piezoelectric properties were investigated. BSO exhibited a high thermal stability in the temperature range of 25–500 °C, while BTO showed a variation of ~3% in the range of 25–350 °C. The high values of d14 and k14, together with the good thermal stability, make BTO and BSO crystals potential candidates for electromechanical applications in medium temperature range.
Keywords: sillenite-type crystals; piezoelectric; orientation dependence; thermal stability sillenite-type crystals; piezoelectric; orientation dependence; thermal stability

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Shen, C.; Zhang, H.; Zhang, Y.; Xu, H.; Yu, H.; Wang, J.; Zhang, S. Orientation and Temperature Dependence of Piezoelectric Properties for Sillenite-Type Bi12TiO20 and Bi12SiO20 Single Crystals. Crystals 2014, 4, 141-151.

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