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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。
A 0.8Na_ (0.5) Bi_ (0.5) TiO_3: 0.2ZnO lead-free multi-phase ferroelectric ceramics was prepared by two-step solid phase method. The sintering properties, microstructure and ferroelectric properties of the multiphase ceramics prepared by different sintering temperatures . The results show that the third phase Zn 2 Ti 4 O 4 is produced by introducing 20% (mole fraction) ZnO into Na 0.5 Bi 0.5 TiO 3, and the content of Zn 2 Ti 4 O 4 increases with increasing sintering temperature. The remanent polarization of ceramic samples sintered at 1000 ℃ still retains 81% at room temperature at 135 ℃, and the remanent polarization of different samples does not decrease with the increase of sintering temperature. It is proved that the built-in electric field formed by ZnO increases the ferroelectric stability of Na 0.5 Bi 0.5 TiO 3.