The aging rates of K and tan δ were determined for some ferroelectric and antiferroelectric PLZT compositions as a function of frequency and DC bias. The aging reached a maximum at the FER-AF0 boundary. The antiferroelectric compositions exhibited aging in both K and tan δ. PbZrO3 has a K aging rate of 2.4% per decade. All aging rates were found to decrease with increasing frequency. DC bias increased the aging rate of K for the ferroelectrics and had little effect on the antiferroelectrics.
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Schulze et al. (1975) studied this question.
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