标题：High-temperature piezoelectric crystals ReCa4O(BO3)3: a review
作者：Fapeng Yu;Shuai Hou;Xian Zhao;Shujun Zhang
作者机构：[Yu, F] State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan, China;[ Hou, S] State Key Laboratory of 更多
通讯作者地址：[Yu, FP]Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China.
来源：IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
关键词：elasticity;electrical resistivity;gadolinium compounds;lanthanum compounds;neodymium compounds;piezoelectric materials;piezoelectricity;specific heat;thermal conductivity;thermal expansion;vibrational modes;yttrium compounds;elastic properties;electrical power plants;electrical resistivity;electroelastic properties;electromechanical properties;furnace components;high-temperature sensors;jet engines;next-generation turbines;nondestructive evaluation;optimized crystal cuts;piezoelectric properties;rare-earth calcium oxyborate crystals;specific heat;structural health monitoring;temperature dependences;thermal conductivity;thermal expansion;vibration modes;Crosstalk;Crystals;Dielectrics;Temperature;Temperature sensors;Vibrations
摘要：High-temperature sensors are desirable for structural health monitoring and/or nondestructive evaluation of next-generation turbines, more efficient jet engines, and the furnace components of electrical power plants. Of all the investigated high-temperature piezoelectric materials, rare-earth calcium oxyborate crystals ReCa4O(BO3)3 (ReCOB, Re: rare-earth) exhibit attractive advantages for high-temperature piezoelectric sensing. In this paper, the electroelastic properties of different ReCOB piezoelectric crystals are investigated. The crosstalk between various vibration modes are discussed, from which the optimized crystal cuts are achieved. Furthermore, temperature dependences of the electrical resistivity, dielectric, elastic, piezoelectric, and electromechanical properties of ReCOB crystals are studied. Finally, the thermal properties, including thermal expansion, specific heat, and thermal conductivity at elevated temperatures are studied and compared with commercially available high-temperature piezoelectric crystals.