通过三个体系的比较，PLMN -PZT四元系材料适中的四方度、晶粒尺寸及晶界处锰的析出是它具有良好压电、介电性能的结构基础。

Their piezoelectric and dielectric properties relate to the structure characters such as suitable tetragonality, moderate grain-size and Mn ions distributed on the grain boundary.

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本文主要对六自由度摇摆试验台的系统设计、运动学理论、位姿误差及控制方法四方面进行分析和研究。

The major research works completed in this dissertation includes: six free-degree swing platform system design, kinematics theory, pose error analysis and control methods.

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