K_(0.48)Li_(0.02)Na_(0.5)(Nb_(1–x)Sb_x)O_3压电陶瓷的制备与性能

采用微波烧结法制备了锑掺杂改性K_(0.48)Li_(0.02)Na_(0.5)NbO_3(KLNN)压电陶瓷,研究了锑掺杂量(x=0,0.02,0.04,0.06,0.08)对陶瓷的微观结构、表面形貌、介电性能、压电性能和铁电性能的影响。结果表明:在掺杂范围内,各组分的陶瓷样品均形成了单一的钙钛矿结构,结晶良好,晶粒均匀,说明金属锑在KLNN晶格中可以形成均匀固溶体,改善了KLNN基无铅压电陶瓷的微观结构,提高了其压电性能和铁电性能。在x=0.06时,K_(0.48)Li_(0.02)Na_(0.5)(Nb_(0.94)Sb_(0.06))O_3陶瓷样品的Curie温度介电常数峰(ε_r)、单向电致应变(ε)、压电系数(d_(33))均达到最大值,分别为ε_r=5 557,ε=0.08%,d_(33)=208 pC/N。