期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 25, 期 4, 页码 425-432出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2004.01.016
关键词
PZT; piezoceramics; domain switching; polarization; strain; preload stress; dielectric and piezoelectric properties
This paper deals with the influence of preload stress on the ferroelectric hysteretic behavior of piezoelectric ceramics. The polarization and strain versus electric field hysteresis loops were measured for soft lead zirconate titanate (PZT) piezoceramic material under various uniaxial compressive stress preloads of up to -400 MPa. The investigation revealed that the superimposed compression load reduced the remnant polarization, decreased the coercive field, and also had a significant impact on the dielectric and piezoelectric properties. With increasing mechanical load, dielectric hysteresis and butterfly hysteresis became less and less pronounced, as the compressive stress prevented full alignment of the domains and induced mechanical depolarization. The slopes of the polarization and strain curves at zero electric field were measured to evaluate the dependence of permittivity and piezoelectric coefficients on the prestress. The experimental results were interpreted in terms of the non-180degrees domain switching process under combined electromechanical loading. (C) 2004 Elsevier Ltd. All rights reserved.
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