The electrocaloric effect (ECE) in gadolinium and tin ions doped lead lanthanum zirconate titanate ceramics was investigated. Five samples with different compositions and hence different relaxor behaviors and polarization properties were prepared via a conventional solid-state reaction process. The ECE was measured directly by a high resolution thermometer from 293 K to 423 K. The results show that the ECE is mainly determined by the number of polarization states and polar-correlation strength. Furthermore, the results reveal that the temperature variation of ECE around Curie temperature is associated with the generation rate, activation energy, size and freezing temperature of polar nanoregions. As a result, Sn doped PLZT composition exhibits the best ECE, i.e., a peak ΔT > 2 K obtained at 5 MV/m, and ΔT > 1.78 K achieved in the whole temperature range measured at the same field, which are very attractive for high performance ECE devices.

研究了g和锡离子掺杂的锆钛酸镧钛酸铅陶瓷中的电热效应（ECE）。通过常规的固态反应过程制备了五个具有不同组成，因此具有不同的弛豫特性和极化特性的样品。ECE是通过293 K至423 K的高分辨率温度计直接测量的。结果表明，ECE主要由极化状态数和极性相关强度决定。此外，结果表明，在居里温度附近，ECE的温度变化与极性纳米区域的产生速率，活化能，大小和凝固温度有关。结果，Sn掺杂的PLZT组合物表现出最佳的ECE，即，在5 MV / m处获得的峰值ΔT> 2 K，以及在同一场测量的整个温度范围内获得的ΔT> 1.78 K，这对于高性能ECE器件非常有吸引力。