锆掺杂对Ba0.5Sr0.5Nb2O6陶瓷铁电性能的影响

摘要

Lead-free ferroelectric ceramics Ba0.5Sr0.5Nb2O6 with and without Zr4+ dopant were prepared by a partial co-precipitation method,and their phase transformation,density and ferroelectric properties were investigated.Results indicate that with the cooperative effects of Zr4+ doping and silica sintering additive,all the ceramics can be well sintered and exhibit a dense and pure tungsten-bronze structureon the sintering behaviors,the coercive field Ec of ceramics,as well as the remanent polarization Pr and the spontaneous polarizationPs,decrease with increasing Zr4+ content.%采用部分共沉淀法制备了纯相及锆掺杂的Ba0.5Sr05Nb2O6无铅铁电陶瓷,研究了其相组成、致密度及铁电性能.结果表明,适量的掺杂锆,并引入SiO2为烧结助剂,可制备出致密、单一的钨青铜Ba0.5Sr0.5(ZrxNb1-x)2O6陶瓷.随着Zr4+掺杂量的增加,陶瓷的矫顽场Ec有所降低,剩余极化强度Pr和饱和极化强度Ps均减小.