la修饰的Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/弛豫铁电传感器工作温度范围增大

Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics Pub Date : 1994-08-07 DOI:10.1109/ISAF.1994.522324

J. Fielding, T. Shrout, S. Jang

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引用次数: 0

摘要

pmn型弛豫器的大电场感应应变和机电耦合特性已广泛应用于致动器和换能器中。研究了La/sup 3+/改性对几种具有室温过渡区的(1-x)PMN-(x)PT复合材料的介电和压电性能的场相关影响。La/sup 3+/修饰的作用，增加了微观-宏观极性转变范围(/spl Delta/T)的宽度(定义为最大介电常数温度(T/sub max/)与退极化温度(T/sub d/)之差)，从而使获得大的感应机电耦合因子的温度范围更宽，而滞后可以忽略不计。

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Increased operating temperature range in La-modified Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ relaxor ferroelectric-based transducers

The large E-field induced strains and electromechanical coupling in PMN-based relaxors have been utilized in actuator and transducer applications. The effect of La/sup 3+/ modifications on the field-dependent dielectric and piezoelectric properties was investigated for several (1-x)PMN-(x)PT compositions with transition regions near room temperature. The effect of La/sup 3+/ modifications, increasing the width of the micro-macro polar transition range (/spl Delta/T), defined as the difference between the temperature of maximum permittivity (T/sub max/) and the depolarization temperature (T/sub d/), results in a broader temperature range for obtaining large induced electromechanical coupling factors with negligible hysteresis.

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Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics

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