Pyroelectricity: microscopic estimates and upper bounds

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Abstract
By combining the Born theory of pyroelectricity with a microscopic theory of dielectric properties, it is shown how an order-of-magnitude estimate of the pyroelectric coefficientp at low temperatures can be made from phonon theory in certain favourable cases. The ratio omega M/ omega D' omega M being a characteristic optic mode frequency and omega D the Debye frequency, is an essential dimensionless parameter determining the magnitude of p. The thermodynamics of pyroelectrics is used to calculate upper bounds to the pyroelectric coefficients of a variety of materials at room temperature. The low-temperature bound yields pD and the dielectric constant.

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