HIGH TEMPERATURE PIEZOELECTRIC SINGLE CRYSTALS: RECENT DEVELOPMENTS

摘要：

High temperature piezoelectric materials serving at harsh environment without failure are desired for structural health monitoring and/or nondestructive evaluation of the modern aerospace structures at elevated temperatures (above 600oC).In this report,different high temperature piezoelectric crystals,including the langasite (LGS) type crystals and GaPO4 in trigonal system,melilite type and fresnoite type crystals in tetragonal system,and oxyborate crystals in monoclinic system are surveyed,and their properties are compared.Among the LGS type piezoelectric crystals,the structural ordered trigonal Ca3TaGa3Si2O14 (CTGS) crystals as well as the Al substituted CTGS crystals shew relative low dielectric loss (＜5％@600oC),high electromechanical coupling factor (12％～18％@room temperature) and good temperature stability of piezoelectric properties up to 900oC,potential for usages in middle-high temperature range.Interestingly,the monoclinic RECa4O(BO3)3 (RECOB,Re: rare-earth elements) type crystal were found to own attractive dielectric,piezoelectric and electromechanical properties up to 1000oC,particularly,the YGdCOB crystals were determined to possess temperature independent behavior of piezoelectric properties (variations of piezoelectric d26 ＜-5％ over the tested temperature range),promising for ultrahigh temperature piezoelectric applications.

关键词： Piezoelectric Single crystal High temperature Sensor

作者: Fa-peng YU Fei-fei CHEN Shuai HOU He-wei WANG Yi-an WANG Shi-wei TIAN Chao JIANG Yan-lu LI Xiu-feng CHENG Xian ZHAO

作者单位: Institute of Crystal Materials, Shandong University, Jinan 250100, P. R. China Jinan Foreign Language School International Center, Jinan, 250107, P. R. China

会议类型: 国际会议

会议名称: The 2016 Symposium on Piezoelectricity,Acoustic Waves and Device Applications(2016全国压电和声波理论及器件技术研讨会)

会议地点: 西安

会议语种:英文

页码: 1-7

在线出版日期: 2016-10-21（万方平台首次上网日期，不代表论文的发表时间）