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．
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.
参考文献
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