Nonlinear dielectric properties of (Bi0.5Na0.5)TiO3-based lead-free piezoelectric thick films

作者：Zhang Haibo^*; Jiang Shenglin; Kajiyoshi Koji

来源：Applied Physics Letters, 2011, 98(7): 072908.

DOI：10.1063/1.3557525

The effects of applied dc bias field, temperature, frequency, and doping types on the nonlinear dielectric behaviors of Bi-0.5(Na0.82K0.18)(0.5)TiO3 piezoelectric films with thickness of 40 mu m have been investigated. It is demonstrated that the dielectric permittivity versus ac field amplitude departed from linearity at high temperature, which is caused by a decrease of the coercive field with increasing temperature. The frequency dependence of the dielectric permittivity is related to domain wall pinning. The thicker piezoelectric films exhibit higher extrinsic contribution due to high domain wall mobility and less domain wall pinning, resulting from the increased grain size and film thickness.

• 出版日期2011-2-14
• 单位华中科技大学