【摘要】 本文研究了ＰＭＮ－ＰＴ陶瓷材料微观结构上Ｂ位离子的有序－无序排列情况与宏观的介电性能、相变弥散及电致伸缩效应的联系．ＰＭＮ－ＰＴ介电常数很高，在室温附近发生弥散相变，电致伸缩效应显著，形变量达１×１０－３．采用退火处理的方法，可提高ＰＭＮ－ＰＴ的Ｂ位有序度，展宽弥散相变温区，改善材料的热稳定性和滞后现象．更多还原

【Abstract】 The relation of structural order-disorder on the B-sites to the diffuse phase transition, dielectric and electrostrictive properties has been investigated for the solid solution PMN-PT ceramics. With the curic range raised to room temperature, their large dielectric constants and polarizations result in strong electrostrictive effects with strains about 1×10-3. While with more ordering and more diffuse phase transition aller annealing, the temperature stability is improved as well as the hysteresis is reduced,which are favorable for practical application.更多还原