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

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

1,2
,
1,* , 1
,
1
,
1
,
1
 and
2,*
1 State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan 250100, Shandong, China 2 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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Abstract

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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