研究了扩散相变中心温度分别为40℃和65℃的两种La-掺杂PMN基陶瓷在其扩散相变温度范围的电致应变、电致应变随电场(S～E)的滞后特性和剩余应变效应．结果发现，对于扩散相变中心温度为40℃的材料在0～1kV／mm单向电场驱动下，从-10～60℃电致应变和滞后都随温度的升高而减小；对另一种材料无论由± 1kV／mm交变电场或由 0～ 1kV／mm单向电场驱动，温度从13～41℃变化均出现电致应变峰值，而滞后和剩余应变随温度的升高而减小．对以上实验结果本文作了详细讨论．
The electrostrictive strain, hysterestic (S ～ E) nature and remanent strain effect were investigated in their diffuse phase transition temperature rang for two kinds of La-doping PMN-based ceramics with the diffuse phase transition center temperature 40℃ and 65℃ respectively. The experimental results show that for the material with diffuse phase transition center temperature 40℃, its strain and hysteresis decrease as temperature increases in the range of-10℃to 60℃ driving by 0～ 1kV/mm one direction field, and for the other material whether driving by + 1kV/mm AC field or 0～ 1kV/mm one direction field the strains exhibit a peak value with temperature change from 13℃ to 41℃, the remanent strain and hysteresis decrease monotonically with temperature increase. Above experimental results were also explained in detail.
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