溶胶-凝胶法制备锰掺杂(Bi0.5Na0.5)0.94Ba0.06TiO3无铅陶瓷的压电特性

溶胶-凝胶法制备锰掺杂(Bi_0.5Na_0.5)_0.94Ba_0.06TiO₃无铅陶瓷的压电特性

摘要: 用溶胶-凝胶工艺制备了(Bi_0.5Na_0.5)_0.94Ba_0.06TiO₃+xwt%Mn(x=0-0.4)系列无铅压电陶瓷。研究发现适量锰的掺杂可以有效地降低材料的介电常数和介电损耗,同时提高材料的退极化温度,但过量锰的掺杂使得材料的压电特性变差。当锰的掺杂量为0.1wt%时,陶瓷具有该系列最大的压电常数(d₃₃=175×10^-12C/N)、最大的机电耦合系数k_t=56%,k_p=26%)、较小的介电损耗t_gδ=2.7%,较高的退极化温度(T_d=82℃)。

Abstract: The dielectric and piezoelectric properties of （Bi_0.5Na_0.5）_0.94Ba_0.06TiO_3+x wt%Mn （x=0-0.4） ceramics prepared by sol-gel method were studied. It is found that small amount of Mn addingcan decrease dielectric constant and dielectric loss but increase piezoelectric constant and depolarization temperature.The Mn-doped （Bi_0.5Na_0.5）_1-xBaxTiO₃ （x=0.1） ceramics have large piezoelectric constant （d₃₃=175×10^-12C/N）, large electromechanical coupling coefficient （k_t=56%,kp=26%p）,relatively lower dielectric loss （t_gδ=2.7%） and relatively higher depolarization temperature（T_d=82℃）.