Piezoelectric Characterization of (0.6)BiFeO ₃ –(0.4)PbTiO ₃ Multiferroic Ceramics

Abstract

In this work, the full piezoelectric characterization of high‐energy ball‐milled (HEBM) (0.6)BiFeO 3 –(0.4)PbTiO 3 (HE‐BF PT60/40) multiferroic magnetoelectric ceramics was performed. The whole set of piezoelectric, mechanical, and elastic coefficients was obtained. The results revealed piezoelectric coefficients, namely d 31 =−41.6 × 10 −12 m/V and g 31 =−9.65 × 10 −3 Vm/N (at room temperature), as high as those of other commercial piezoceramics. In fact, HE‐BFPT60/40 piezoceramics produced by HEBM showed three times higher piezoelectric coefficients than those previously reported for conventionally synthesized piezoceramics. The thermal stability of d 31 and g 31 piezoelectric coefficients near room temperature, as well as the weak ferromagnetic response of HE‐BFPT60/40 samples, make the (0.6)BiFeO 3 –(0.4)PbTiO 3 multiferroic magnetoelectric ceramics potential candidates for applications in future multifunctional piezo‐magnetic–electric devices.