High Curie temperature BiInO₃-PbTiO₃ films

High Curie temperaturepiezoelectricthin films of xBiInO₃-(1-x)PbTiO₃ (x = 0.10, 0.15, 0.20, and 0.25) were prepared by pulsed laser deposition. It was found that the tetragonality of films decreased with increasing BI content. The dielectric constant and transverse piezoelectric coefficient (e₃₁ ) exhibit the highest values of 665 and -13.6 C/m² at x = 0.20. Rayleigh analyses were performed to identify the extrinsic contributions to dielectric nonlinearity with different x. The composition with x = 0.20 also exhibits the largest extrinsic contributions to dielectric nonlinearity. The Curie temperature (T ) is increased with increasing x content from 558 to 633 °C; T at x = 0.20 is about 584 °C.