（Mo1/2Sr1/2）4＋掺杂Bi1/2Na1/2TiO3无铅压电陶瓷结构及其性能研究*

摘要

Lead-free piezoelectric ceramics,Bi1/2 Na1/2 Ti1 - (Mo 1/2 Sr1/2 )O 3 (abbreviated as BNT-MS-100 ), were fabricated by a conventional solid state reaction method.The effect of the doping of (Mo 1/2 Sr1/2 )4+ on the microstructure and electric properties of the ceramics were investigated.The results showed that the BNT-based ceramics with (Mo 1/2 Sr1/2 )4+ doping did not change the crystal structure and have formed a pure perovskite phase with a dense structure.With (Mo 1/2 Sr1/2 )4+ doping increases,the Curie temperature increased,the rem-nant polarization increased first and then decreased,giving its maximum value at =0.004,where the Bi1/2 Na1/2 Ti1 - (Mo 1/2 Sr1/2 )O 3 ceramics exhibited the highest piezoelectric constant of 3 3 =104 pC/N,together with the lowest dielectric loss tan of 4.1 1%.%采用传统陶瓷制备工艺制备出了 Bi1/2 Na1/2 Ti1-(Mo 1/2 Sr1/2)O 3(简称 BNT-MS-100)系无铅压电陶瓷材料,研究了(Mo 1/2 Sr1/2)4＋掺杂量对 BNT 基陶瓷材料显微结构和电学性能的影响.研究结果表明,(Mo 1/2 Sr1/2)4＋掺杂并未影响 BNT 陶瓷的晶体结构,仍为纯钙钛矿型结构,而且致密性良好.随着(Mo 1/2 Sr1/2)4＋掺杂量增加,居里温度升高,剩余极化强度先增大后减小.当＝0．004时,BNT-MS-100陶瓷的压电系数最大,33＝104 pC/N,介电损耗最小, tan ＝4．11％.