Systematic Study of Pyroelectricity. Generalized Molecular Field Theory of Ferroelectricity and Pyroelectricity
Semiannual technical rept. 1 Oct 1974-31 Mar 1975
BELFER GRADUATE SCHOOL OF SCIENCE NEW YORK
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The generalized molecular field theory of ferroelectricity developed previously by the authors is used to obtain exact expressions for the ferroelectric properties of crystals spontaneous polarization, dielectric susceptibility, critical temperature and polarization and for the resulting pyroelectric properties pyroelectric coefficient and response figure of merit for radiation detection. Good agreement between theory and experiment is found for the spontaneous polarization of triglycine sulfate. The response figure of merit is found to exhibit an interesting universal behavior which may prove useful in optimizing detector performance. The well-known Devonshire formalism, obtained by truncating the power-series expansion for the free energy, is found to yield a relatively poor approximation to the results of the generalized molecular field theory.
- Electricity and Magnetism