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The piezoelectric coefficient of commercial polyvinylidene fluoride piezoelectric film was found to decrease with increasing preload due to a stress-dependent modulus; preload had no effect on the pyroelectric coefficient, in keeping with current theory. Both coefficients demonstrated an irreversible rise on heating due to amorphous phase depolarization at the T g, near 80°C in this highly oriented material, following which these values were temperature-independent in the range 20–100°C.
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Chen et al. (1982) studied this question.
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