Acoustic-mode contributions to pyroelectric compliance

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Abstract
A recently developed thesis by Grout, March and Thorp (see ibid., vol.8, p.2167 (1975)) that acoustic-mode or 'Born-function' contributions to the pyroelectric compliance p are a dominant feature of strong pyroelectricity is challenged. Weaknesses in the argument are stressed and evidence is presented that, for at least one example, namely LiTaO3, acoustic contributions are barely measurable, contributing a maximum of 2.5*10-5 mu C cm-2 K-1 to p, an amount which is only of the order of 0.1% of the total pyroelectric compliance of LiTaO3 at room temperature.