Piezoelectric properties of Mn-doped (Bi_0.5Na_0.5)_0.94Ba_0.06TiO₃ ceramics prepared by Sol-Gel method

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℃）.