Negligible oxygen liberation during bipolar electric cycling of ferroelectric lead zirconate titanate ceramics

The long-standing question whether or not oxygen gas is liberated from the perovskite lattice during fatigue of ferroelectric lead zirconate titanate ceramics is addressed. During cycling, the surrounding gas atmosphere of th e sample was analyzed continuously by a mass spectrometer. It was found tha t, in contrast to previous statements in the literature, the oxygen detecte d originates from air dissolved in the surrounding liquid. An upper limit f or oxygen liberation from the sample is given. We conclude that all mechani stical approaches for ferroelectric fatigue based on oxygen liberation are in need of revision. (C) 2001 American Institute of Physics.