Abstract
High-field nonlinear dielectric and piezoelectric properties of Fe2O3 doped PMnS-PZN-PZT high-power piezoelectric ceramics are investigated. Rayleigh analysis reveals the presence of contributions from lossless reversible domain wall motion and the associated decoupling of nonlinearity and losses. This behavior is attributed to the orderly distribution of defect pinning centers. With the increase in temperature, the high-field nonlinearity becomes more pronounced. It is suggested that the depinning of domain walls arising from the randomization of defect pinning centers is responsible for this enhancement of high-field nonlinearity at the elevated temperatures.
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