Abstract
The possibilities of the use of calorimetric methods to determine the important features of ferroelectrics – the temperature dependence of the spontaneous polarization and the effective correlation parameter are considered. The relationship between the temperature dependences of the specific heat and the spontaneous polarization is analyzed on an example of the high-temperature uniaxial ferroelectric crystal LaBGeO3. It is shown the particular importance of the proper separation of the anomalous part of the heat capacity from the background one for the quantitative comparison of the specific heat and the spontaneous polarization. The temperature dependence of the specific heat of the thin BaTiO3 thin polycrystalline and epitaxial films on different substrates is obtained, compared and used to determine the spontaneous polarization. The difference of the thermal properties of polycrystalline and epitaxial films confirmed the crucial role of the misfit strains and their relaxation due to formation of the growth dislocations. The precise measurements of the specific heat of BaTiO3 single crystals of different quality are presented with the special attention to the temperature region above the ferroelectric phase transitions. The pretransitional phenomena were studied in details and the effective correlation parameter was determined from the specific heat data – in good agreement with the data obtained by other methods and with the classical theory of critical phenomena in multiaxial ferroelectrics.
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