弛豫型铁电体在准同型相界的压电性能

ＰＭＮ、ＰＺＮ、ＰＮＮ 等弛豫型铁电体与ＰＴ 形成的固溶体在准同型相界附近具有良好的压电性能。在ＰＭＮ、ＰＺＮ 的单晶材料中，ｋｐ 高达９２ ％ ，ｄ３３ 达到１５００ｐＣ／ Ｎ， 在以ＰＭＮ、ＰＺＮ、ＰＮＮ 为基的陶瓷材料中，ｄ３３ 分别达到６９０ｐＣ／ Ｎ、６８０ｐＣ／Ｎ 和５４０ｐＣ／ Ｎ，Ｑｍ 在１００ 左右。这类材料的共同特点是机电耦合系数和压电系数较大，而品质因数较小，在压电换能器和致动器领域具有很好的应用前景。

Piezoelectric Properties of Relaxor-based Ferroelectric Materials Near the Morphotropic Phase Boundary

Relaxor-PT materials have good piezoelectric properties near the morphotropic phase boundary.In PMN-PT,PZN-PT crystals,d 33 is up to 1500pC/N,k p is up to 92%.In PMN,PZN,PNN ceramics system,d 33 reaches 690pC/N,680pC/N and 540pC/N respectively,Q m is about 100.The electromechanical coupling factors and piezoelectric constant are very large in these materials,and these characters make these materials promising candidates for high performance solid state actuators and piezoelectric transducers.