Temperature Dependence of the Heat Capacity in BaTiO_3

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概要

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• Heat capacity of BaTiO3 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 $0.19R$. From this magnitude of the jump it may be concluded that a Ti ion, which is responsible for ferroelectricity in BaTiO3, lies in a single-minimum potential in the absence of an interaction with the other Ti ions.

• 社団法人日本物理学会の論文
• 1976-08-15

著者

• Hatta Ichiro

  Faculty Of Science Tokyo Institute Of Technology Department Of Applied Physics Nagoya University

• Ikushima Akira

  Institute For Solid State Physics The University Of Tokyo

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