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13 August 2003 Nonlinear behavior of piezoelectric lead zinc niobate-lead titanate single crystals under AC electric fields
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Abstract
The nonlinear behavior of the dielectric and piezoelectric resopnse of <001> oriented Pb(Zn1/3Nb2/3)O3-xPbTiO3 (PZN-PT) single crystals for x=4.5% and x=8% have been investigated as a function of AC electric fields and DC bias field. At relatively low applied fields, the polarization and strain of PZN-PT single crystals poled along the <001> direction show little hysteresis and have a linear dependence on the applied field, which is a consequence of engineered domain stability. Hence, the dielectric and piezoelectric coefficients of the material do not exhibit any field dependence. However, when the applied electric field exceeds a threshold value, the strain and dielectric responses become nonlinear. The dielectric and piezoelectric constants are a function of the applied field, and hysteresis loops are observed. The results suggest that the observed nonlinear behavior in the PZN-PT single crystals is caused by domain motion/switching in response to the large AC fields. Applying a positive DC bias can effectively stabilize the domain configuration in the crystals and enhance linear responses. The threshold field, at the onset of nonlinearity, is found to have a linear relation with DC bias field in the field range investigated.
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Wei Ren, Shi-Fang Liu, and Binu K. Mukherjee "Nonlinear behavior of piezoelectric lead zinc niobate-lead titanate single crystals under AC electric fields", Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); https://doi.org/10.1117/12.484694
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