中文摘要：

采用二步固相法制备了0.8Na_（0.5）Bi_（0.5）TiO_3：0.2ZnO无铅复相铁电陶瓷,研究了不同烧结温度制备的复相陶瓷的烧结性能、显微结构和铁电性能。结果表明：Na_（0.5）Bi_（0.5）TiO_3中引入20%（摩尔分数）ZnO后,复相陶瓷产生了第三相Zn_2TiO_4,并且随着烧结温度的升高,Zn_2TiO_4含量逐渐增加。1 000℃烧结的陶瓷样品的剩余极化强度在测试温度为135℃时仍然保留了室温下的81%,且随着烧结温度的升高,不同样品的剩余极化强度没有减小的趋势,证明了ZnO所形成的内建电场提高了Na_（0.5）Bi_（0.5）TiO_3铁电性的高温稳定性。

英文摘要：

Lead-free ferroelectric composite ceramics Na0.sBi0.sTiO3：ZnO （BNT：ZnO） were prepared by a two-step solid phase synthesis method. The sintering ability, microstructures and ferroelectric properties of the composites were investigated by X-ray diffraction and scanning electron microscopy, The results show that the incorporation of 20% （mole fraction） ZnO leads to the formation of the third phase Zn2TiO4, compared to pure BNT phase. The amount of Zn2TiO4 gradually increases with the increase of sintering temperature. According to the hysteresis loops of the composite ceramics at high temperatures, the remanent polarization of the samples sintered at 1 000 ℃ still retains 81% at room temperature when the test temperature is 135 ℃. The remanent polarization of different samples does not reduce as the temperature increases, thus proving that the built-in electric field formed by ZnO improves the ferroelectric stability of BNT at high temperatures.