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新型(Sr0.5Ca0.5)3Ta(Ga0.5Al0.5)3Si2O14高温压电晶体的生长及性能表征
Growth and Characterization of Novel (Sr 0.5 Ca 0.5 ) 3 Ta(Ga 0.5 Al 0.5 ) 3 Si 2 O 14 High Temperature Piezoelectric Crystal
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- DOI:
- 作者:
- 赵桂媛 1 ，刘 蕾 1 ，尹芳艺 1 ，朱孟花 2 ，付秀伟 1
ZHAO Guiyuan 1 , LIU Lei 1 , YIN Fangyi 1 , ZHU Menghua 2 , FU Xiuwei 1 (1. State Key Laboratory of
- 作者单位:
- 1. 山东大学 晶体材料国家重点实验室，山东 济南 250100；2. 西北工业大学 凝固技术国家重点实验室，陕西 西安 710072
1. State Key Laboratory of Crystal Materials, Shandong University, Ji'nan 250100, China; 2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
- 关键词:
- 硅酸镓镧；高温压电；压电系数；提拉法；晶体生长
langasite; high temperature piezoelectric; piezoelectric coefficient; Czochralski method; crystal growth
- 摘要:
- 硅酸镓镧系列晶体因具有较高电阻率和优异的压电性能被认为是高温传感器应用的优选材料。 本文在国际上首次采用提拉法成功生长了新型 (Sr 0.5 Ca 0.5 ) 3 Ta(Ga 0.5 Al 0.5 ) 3 Si 2 O 14 (SCTGAS) 高温压电晶体，并研究了离子取代对晶体生长及电学性能的影响。 生长的 SCTGAS 晶体无色，结晶质量较好，呈现出板面生长形态，在可见光波段具有较高的透过性。 在 450 ℃ 测试温度下， 该晶体的电阻率仍高于 10 9 Ω · cm 。 此外， Sr 取代能够显著增强晶体的高温压电系数d11 ， 550 ℃ 时该值达到 5.55 pC/N 。 因此， SCTGAS 晶体在高温压电传感器领域展现出良好的应用潜力。
Langasite crystals are considered the preferred materials for high-temperature sensors due to their high resistivity and excellent piezoelectric properties. In this paper, a novel (Sr 0.5 Ca 0.5 ) 3 Ta(Ga 0.5 Al 0.5 ) 3 Si 2 O 14 (SCTGAS) high temperature piezoelectric crystal was successfully grown by the Czochralski method for the first time. The effects of ion substitution on crystal growth and electrical properties were then studied. The as-grown SCTGAS crystal is colorless with a plate growth morphology, having high transmittance in the visible light band. The crystal shows a high resistivity, with a value over 10 9 Ω · cm at 450 ℃. In addition, Sr substitution can significantly enhance the piezoelectric coefficient d 11 , which reaches 5.55 pC/Nat 550 ℃. Therefore, the SCTGAS single crystal is very promising for high-temperature piezoelectric sensors. Key words ： langasite; high temperature piezoelectric; piezoelectric coefficient; Czochralski method; crystal growth.