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

• Published in: Crystals (Basel) Vol. 4; no. 2; pp. 141 - 151
• Main Authors: Shen, Chuanying, Zhang, Huaijin, Zhang, Yuanyuan, Xu, Honghao, Yu, Haohai, Wang, Jiyang, Zhang, Shujun
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.06.2014
• Subjects: Constants; Crystals; Dielectric properties; Electrical resistivity; Orientation; orientation dependence; piezoelectric; Piezoelectricity; sillenite-type crystals; Single crystals; Temperature dependence; thermal stability
• ISSN: 2073-4352; 2073-4352
• DOI: 10.3390/cryst4020141

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.