Dielectric and piezoelectric properties of Mn-doped BaTiO₃–BiFeO₃–Bi-based perovskite ceramics

Abstract

Effect of Mn-doping on dielectric and piezoelectric properties of BaTiO₃–Bi(Mg_1/2Ti_1/2)O₃–BiFeO₃ (BT–BMT–BF) ceramics was investigated. X-ray diffraction patterns showed that 0.5wt%MnCO₃ doped 0.45BT–0.2BMT–0.35BFO and 0.3BT-0.1BMT-0.6BFO ceramics belonged to the pseudo-cubic and rhombohedral phases, respectively. The Mn-doping was found to reduce the dielectric loss of the ceramics, especially at elevated temperatures. Temperature dependence of the dielectric properties of 0.45BT–0.2BMT–0.35BFO and 0.3BT-0.1BMT-0.6BFO showed that the response was relaxor and ferroelectric, respectively, with the peak temperature higher than 300˚C.