Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8148402 | Journal of Crystal Growth | 2018 | 7 Pages |
Abstract
High temperature piezoelectric crystals are desired for sensing at elevated temperatures. In this work, a large size (2â¯in.) and low cost Ca2Al2SiO7 (CAS) crystal was grown by using the Czochralski pulling method. Thermal expansion coefficients α11 and α33 were measured and found to be on the order of 5.70â¯Ãâ¯10â6/°C and 10.12â¯Ãâ¯10â6/°C, respectively. The electrical resistivities of the CAS crystal along the X- and Z-directions at 700â¯Â°C were found to be 3â¯Ãâ¯107 and 2â¯Ãâ¯108â¯Î©Â·cm, respectively. The electro-elastic constants were evaluated by using the impedance and pulse-echo methods, where the piezoelectric coefficients d14 and d36 were determined to be 6.7 and 2.8â¯pC/N at room temperature, respectively. Moreover, the temperature dependence of the electro-elastic properties of the CAS crystal was investigated. The variation of elastic compliances was found to be <6% over the tested temperature range of 20-700â¯Â°C. The optimum crystal cuts with the maximum longitudinal and thickness shear piezoelectric coefficients for the CAS crystal were predicted, where the largest longitudinal piezoelectric d11â (3.1â¯pC/N) was achieved for the (XYtl)45°/â55° crystal cut, and the largest shear piezoelectric d26â (4.7â¯pC/N) was found for the (YXl)45° crystal cut, nearly two times that of α-quartz.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Chao Jiang, Yong Long, Fapeng Yu, Lingfeng Kong, Feifei Chen, Shiwei Tian, Lifeng Qin, Xiufeng Cheng, Xian Zhao,