Abstract
High-temperature piezoelectric thin films of 0.20BiInO3-0.80PbTiO3 (20BI-PT) were prepared via pulsed laser deposition and investigated by comparison with 0.15BiInO3-0.85PbTiO3(15BI-PT). XRD patterns show that (100) peak of 20BI-PT has been split, indicating a higher tetragnality than in 15BI-PT. FESEM images reveal some triangular grains corresponding to [111]-oriented grains in 20BI-PT. The remanent polarization (Pr) and coercive field (Ec) of 20BI-PT are ～ 28 C/cm2 and ～120 kV/cm, respectively. It is shown that the transverse piezoelectric coefficient e31, f keeps almost the same in 20BI-PT and 15BI-PT. The temperature dependence of dielectric permittivity in 20BI-PT reveals a higher Curie temperature (590 ℃) than that in 15BI-PT and no apparent frequency dependence is detected. Rayleigh analyses are performed to identify the extrinsic contributions to dielectric nonlinearity for different x. It is seen that x=0.15 exhibits greater extrinsic contributions to dielectric nonlinearity than the other compositions.
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