Remarkable piezoelectricity and stable high‐temperature dielectric properties of quenched BiFeO 3 –BaTiO 3 ceramics

Effects of quenching process on dielectric, ferroelectric, and piezoelectric properties of 0.71BiFeO 3 −0.29BaTiO 3 ceramics with Mn modification (BF–BT− x mol%Mn) were investigated. The dielectric, ferroelectric, and piezoelectric properties of BF–BT− x mol%Mn were improved by quenching, especially to the BF–BT−0.3 mol%Mn ceramics. The dielectric loss tanδ of quenched BF–BT−0.3 mol%Mn ceramics was only 0.28 at 500°C, which was half of the slow cooling one. Meanwhile, the remnant polarization P r of quenched BF–BT−0.3 mol%Mn ceramics increased to 21 μC/cm 2 . It was notable that the piezoelectric constant d 33 of quenched BF–BT−0.3 mol%Mn ceramics reached up to 191 pC/N, while the T C was 530°C, showing excellent compatible properties. The BF–BT− x mol%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− x mol%Mn ceramics were larger than the unquenched ceramics. These results presented that the quenched BF–BT− x mol%Mn ceramics were promising candidates for high‐temperature piezoelectric devices.