Maxwell-Wagner piezoelectric relaxation in ferroelectric heterostructures

Using a serial bilayer model we show that heterogeneous ferroelectric systems may exhibit substantial Maxwell-Wagner piezoelectric relaxation. The relaxation has its origin in the coupling of the dielectric and piezoelectric properties. The model predicts both retardation (positive phase angle and counterclockwise charge-pressure hysteresis) and relaxation (negative phase angle and clockwise charge-pressure hysteresis) of the longitudinal direct piezoelectric coefficient. The theoretical results are confirmed experimentally in ferroelectric ceramic-ceramic bilayers and in a single-phase ferroelectric Aurivillius compound ceramic in which neighboring grains with strongly anisotropic properties may behave as basic Maxwell-Wagner units. (C) 2001 American Institute of Physics.


Published in:
Journal of Applied Physics, 90, 11, 5708-5712
Year:
2001
ISSN:
0021-8979
Keywords:
Note:
Damjanovic, D Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, Dept Mat, Ceram Lab, CH-1015 Lausanne, Switzerland Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, Dept Mat, Ceram Lab, CH-1015 Lausanne, Switzerland
491UV
Times Cited:9
Cited References Count:17
Laboratories:




 Record created 2006-08-21, last modified 2018-03-17


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