Remarkable piezoelectricity and stable high‐temperature dielectric properties of quenched BiFeO3–BaTiO3 ceramics

Abstract

AbstractEffects 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−0.3 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 Pr of quenched BF–BT−0.3 mol%Mn ceramics increased to 21 μC/cm2. It was notable that the piezoelectric constant d33 of quenched BF–BT−0.3 mol%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 unquenched ceramics. These results presented that the quenched BF–BT−xmol%Mn ceramics were promising candidates for high‐temperature piezoelectric devices.