Nonlinearity and scaling behavior in donor-doped lead zirconate titanate piezoceramic
- 25 May 1998
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 72 (21) , 2692-2694
- https://doi.org/10.1063/1.121101
Abstract
Two different effective thresholds for the onset of nonlinearity in the dielectric and piezoelectric coefficients of donor-doped lead zirconate titanate (soft PZT) piezoceramics at electric ac fields Ec1≈100 V/cm and Ec2≈1 V/cm are found. Both are characterized by a scaling behavior x=x0+A[E−Ec)/Ec]φ above the respective threshold, where x is the dielectric or piezoelectric coefficient. The values of the effective exponent φ are apparently independent of the particular ceramic system which suggests a universal behavior in soft PZT. We suggest that the nonlinearity is dominated by the dynamics of domain walls in a randomly pinned medium.Keywords
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