High temperature piezoelectric single crystal ReCa4O(BO3)3 for sensors

Shujun Zhang, T. Shrout, Y. Fei, B. Chai, E. Frantz, D. Snyder
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引用次数: 9

Abstract

Large size and high quality ReCa4O(BO3)3 single crystals were grown by the Czochralski pulling method. In this work, the electrical properties were investigated at room temperature and elevated temperature for YCa4O(BO3)3 (YCOB). The dielectric permittivity, piezoelectric strain coefficient and electromechanical coupling were found to be on the order of 11, 6 pC/N and 12.5%, respectively, with a high piezoelectric voltage coefficient around 0.067 Vm/N. The electrical resistivity of YCOB was found to be 2times108 Ohm.cm at 800degC, with Q values of >4,500 at 950degC. The frequency/temperature coefficient of YCOB was found to be -75 ~ -85 ppm/K in the temperature range of 30-950degC, depending on the crystal orientation. Together with its temperature independent properties, ReCOB crystals are promising candidates for sensing applications at elevated temperatures.
传感器用高温压电单晶reca40o (BO3)3
采用Czochralski法生长了大尺寸、高质量的reca40o (BO3)3单晶。本文研究了yca40 (BO3)3 (YCOB)在室温和高温下的电学性质。介质介电常数、压电应变系数和机电耦合系数分别约为11、6 pC/N和12.5%,压电电压系数约为0.067 Vm/N。YCOB的电阻率为2倍108欧姆。在800℃时,Q值> 4500,在950℃时Q值> 4500。在30 ~ 950℃的温度范围内,YCOB的频率/温度系数随晶体取向的不同在-75 ~ -85 ppm/K之间。再加上它与温度无关的特性,ReCOB晶体是在高温下传感应用的有希望的候选者。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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