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

Crystals

Chuanying Shen¹  Huaijin Zhang¹  Yuanyuan Zhang¹  Honghao Xu¹  Haohai Yu¹  Jiyang Wang¹ 

[1] State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan 250100, Shandong, China; E-Mails:

关键词: sillenite-type crystals;    piezoelectric;    orientation dependence;    thermal stability;   

DOI  :  10.3390/cryst4020141

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.