Remarkable piezoelectricity and stable high-temperature dielectric properties of quenched BiFeO3-BaTiO3ceramics

Effects of quenching process on dielectric, ferroelectric and piezoelectric properties of 0.71BiFeO3-0.29BaTiO3 ceramics with Mn modification (BF-BT-xmol%Mn) were investigated. The dielectric, ferroelectric and piezoelectric properties of BF-BT-xmol%Mn were improved by quenching, especially to the BF-BT-0.3mol%Mn ceramics. The dielectric loss tanδ of quenched BF-BT-0.3mol%Mn ceramics was only 0.28 at 500 °C, which was half of the slow cooling one. Meanwhile, the remnant polarization Pr of quenched BF-BT- 0.3mol%Mn ceramics increased to 21 μC/cm2. It was notable that the piezoelectric constant d33 of quenched BF-BT-0.3mol%Mn ceramics reached up to 191 pC/N, while the TC was 530 °C, showing excellent compatible properties. The BF-BT-xmol%Mn system ceramics showed to obey the Rayleigh law within suitable field regions. The Rayleigh law results indicated that the extrinsic contributions to the dielectric and piezoelectric responses of quenched BF-BT-xmol%Mn ceramics were larger than the un-quenched ceramics. These results presented that the quenched BF-BT-xmol%Mn ceramics were promising candidates for high-temperature piezoelectric devices. This article is protected by copyright. All rights reserved.