Effect of Zr/Ti ratio on the dielectric and piezoelectric properties of Mn-doped Ba(Zr, Ti)O_3 ceramics

摘要

Lead-free piezoelectric Ba(Zr_yTi_(1-y)O_3:0.5 mol%Mn (abbreviated as BZTM-l00y, y = 0.04, 0.045, 0.05, and 0.055) ceramics were prepared via the conventional solid-state reaction method. The cubic to tetragonal phase transition temperature (T_c) shifts to lower temperature with increasing Zr concentration, and the transition temperature from tetragonal to orthorhombic (T_(0-t)) which is a shift to higher temperature from 26 to 47 ℃ with increasing y value from 0.04 to 0.055. And a small amount of Mn can improve effectively the electrical properties, especially the piezoelectric properties of the BZT ceramics. Compared to the pure BZT ceramics, the Mn-doped BZTM ceramic shows an excellent piezoelectric coefficient d_(33) as 213 pC/N.