A thermodynamic theory is used to determine the effective pyroelectric coefficients of polarization graded ferroelectrics, with values in excess of 0.1μC∕cm2°C are predicted for various barium strontium titanate thin films. Maximum values closer to 0.4μC∕cm2°C are obtained for a 1μm thick material—compositionally graded between pure barium titanate and one that has barium to strontium in the ratio of 75:25.
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Alpay et al. (2005) studied this question.
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