无机材料学报

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PMN-PT驰豫铁电单晶及其超声换能器性能研究

李国荣; 罗豪甦; 殷庆瑞   

  1. 中国科学院上海硅酸盐研究所无机功能材料开放实验室 上海 200050
  • 收稿日期:2000-12-05 修回日期:2001-03-20 出版日期:2001-11-20 网络出版日期:2001-11-20

PMN-PT Ferroelectric Relaxor Crystal and Its Ultrasonic Transducer

LI Guo-Rong; LUO Hao-Su; YIN Qing-Rui   

  1. Laboratory of Functional Inorganic Materials; Shanghai Institute of Ceramics; Chinese Academy of Sci- ences; Shanghai 200050; China
  • Received:2000-12-05 Revised:2001-03-20 Published:2001-11-20 Online:2001-11-20

摘要: 测试了PMN-PT(67/33)切型铁电单晶的机电性能,分析了该晶体与常用压电材料在微观结构和机电性能上差异.对该压电单晶未调制下纵向长度伸缩振动模超声换能器性能进行了理论分析.讨论了压电单晶的机械和介电损耗对超声换能器性能的规律.

关键词: PMN-PT单晶, 压电, 介电, 换能器

Abstract: The electric and mechanical properties of PMN-PT (67/33) ferroelectric relaxor crystal were measured. The piezoelectric and dielectric properties of PMN-PT crystal was discussed in comparison with the generally used piezoelectric ceramics and polymer. The performances of the unturned PMN-PT ultrasonic transducer with longitudinal vibration mode was evaluated. The influence of the PMN-PT dielectric and mechanical loss on impedance and transducer loss were discussed.

Key words: PMN-PT single crystal, piezoelectricity, dielectrics, transducer

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