标题：High temperature piezoelectric properties of yttrium calcium oxyborate single crystals
作者：Yu, Fapeng; Zhang, Shujun; Zhao, Xian; Yuan, Duorong; Wang, Qingming; Shrout, Thomas R.
作者机构：[Yu, Fapeng; Zhang, Shujun; Shrout, Thomas R.] Penn State Univ, Mat Res Lab, University Pk, PA 16802 USA.; [Yu, Fapeng; Zhao, Xian; Yuan, Duorong] S 更多
通讯作者地址：[Zhang, SJ]Penn State Univ, Mat Res Lab, University Pk, PA 16802 USA.
来源：PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
关键词：single crystals; piezoelectric; high temperature; sensors
摘要：The piezoelectric single crystal yttrium calcium oxyborate, YCa(4)O(BO(3))(3), was studied as a function of orientation and temperature. The resistivity of Y-cut samples was found to be 2.7 x 10(7) Omega cm at 950 degrees C, three orders of magnitude higher than langatate crystals. The electromechanical coupling k(26) and piezoelectric d(26) were found to be 22% and 10 pC/N at room temperature for (ZXw)-30 degrees-cut samples, respectively, maintaining similar values at elevated temperature of 950 degrees C, exhibiting temperature independent behavior. Furthermore, the highest temperature frequency coefficient was obtained in (ZXw)-33 degrees-cut samples, being -91 ppm/K. The temperature independent piezoelectric properties, together with the high resistivity and mechanical quality factor Q (similar to 2000 at 950 degrees C), suggest the YCOB crystal to be a good candidate for high temperature sensing applications. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim