Abstract
Bipolar fatigue of ferroelectric lead zirconate titanate ceramics can be partly recovered by thermal annealing. For samples of initially, intermediately, or highly fatigued state, subsequent refatiguing yields a much more rapid decay in polarization and piezoelectric constant than the initially nonfatigued samples despite very similar recovery from annealing. The “material memory” of the prior fatigue treatment is discussed in the framework of microcracking and fixed polarization by crack face charges.
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