Temperature Dependence of the Heat Capacity in BaTiO3

Autor:	Ichiro Hatta, Akira Ikushima
Rok vydání:	1976
Předmět:	Crystal Condensed Matter::Materials Science Flux method Differential scanning calorimetry Materials science Volumetric heat capacity Transition temperature General Physics and Astronomy Thermodynamics Atmospheric temperature range Ferroelectricity Heat capacity
Zdroj:	Journal of the Physical Society of Japan. 41:558-564
ISSN:	1347-4073 0031-9015
DOI:	10.1143/jpsj.41.558
Popis:	Heat capacity of BaTiO 3 has been measured in the vicinity of the ferroelectric-to-paraelectric transition temperature by using both the crystal grown by the top-seeded solution technique and that grown by the flux method. It is found that the temperature dependence of the heat capacity over a rather wide temperature range is well expressed by the free-energy function obtained by Drougard and Huibregtse. Furthermore, under the stress-clamped condition it is estimated from the above free-energy function that the jump of the molar heat capacity at the second order transition temperature is 0.19 R . From this magnitude of the jump it may be concluded that a Ti ion, which is responsible for ferroelectricity in BaTiO 3 , lies in a single-minimum potential in the absence of an interaction with the other Ti ions.
Databáze:	OpenAIRE
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