The absence of dielectric divergence in improper ferroelectrics makes it possible to obtain a high pyroelectric figure of merit near their transition temperature. Results of measurements carried out as a function of temperature on representatives of three classes of improper ferroelectrics: rare-earth molybdates, propionates, and boracites, show that in each of these the figure of merit rises to a peak value which is superior to that of triglycine sulfate. Analysis of the experimental results using a Landau type free-energy model yields an estimate of the optimum figure of merit obtainable.
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Shaulov et al. (1980) studied this question.
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