Abstract
The pyroelectric and electrocaloric effects in the phase transition region of thin ferroelectric wafers, as part of a metalferroelectric-metal (MFM) system, are investigated experimentally and theoretically. Experiments on the dynamical pyroelectric effect are carried out on triglycine sulphate crystals (TGS). A theory of dynamical pyroelectric and electrocaloric effects in the presence of an internal electric field (depolarizing, influence of contact and of surface charges) is developed. An expression for the shift of the pyroelectric current maximum temperature (PCMT) with respect to the Curie point is derived and the influence of the electrocaloric effect on this shift is investigated. It is shown that with decreasing thickness of the ferroelectric wafer the phase transition temperature and the PCMT shift to lower temperatures, and also the pyroelectric current maximum decreases. From the pyroelectric current measurements on pure TGS and on TGS doped with L-α-alanine the Curie constant is determined. A...
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