Temperature dependence of electro-elastic properties of yttrium calcium oxyborate single crystlals

• Published in: 2012 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA) pp. 293 - 297
• Main Authors: Fa-peng Yu, Xiu-lan Duan, Shu-jun Zhang, Yong-gui Yu, Ting-feng Ma, Xian Zhao
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.11.2012
• Subjects: Couplings; Crystals; High temperature sensors; Piezoelectric properties; Temperature dependence; Temperature distribution; Temperature sensors; Vibrations; YCOB crystals
• ISBN: 1467348147; 9781467348140
• DOI: 10.1109/SPAWDA.2012.6464092

High temperature piezoelectric crystals, YCa 4 O(BO 3 ) 3 (YCOB) possess relatively high piezoelectric activities (d eff = ~7.8pC/N, k eff = ~19%) and no phase transition prior to the melting point (~1500°C), indicating the potential use for high temperature sensing. In this work, growth of YCOB single crystals by using Czochralski (Cz) method was introduced and the temperature dependence of electro-elastic properties was investigated from 20 to 950°C, where the resonance frequencies relating to elastic compliances s E 33 and s E 55 , were found to shift linearly with increasing temperature, with relatively large first order temperature coefficient being on the order of ~94ppm/°C. Of particular significance is that the lateral mode of (XY) and (XZ) crystal cuts were found not only possess relatively high electromechanical coupling factor (k eff = ~15%) and piezoelectric coefficient (d eff = ~4 pC/N), but also the temperature independence of electromechanical properties, demonstrating YCOB a good candidate for high temperature piezoelectric sensing.