Heat Capacity of CoCl_2・2H_2O between 7 and 120°K and its Anomaly Associated with Magnetic Transition

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概要

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• A small adiabatic calorimeter is described, which is capable of measuring the solid heat capacities between 5°and 300°K continuously. The heat capacities of CoCl_2.2H_2O were measured between 7°and 120°K. A lambda-shaped anomaly in the heat capacity, due apparently to a transition between antiferromagnetic and paramagnetic states, occurs below 20°K with the peak at 17.20°K. An analysis of the experimental heat capacity curve was made in the light of the series expansion method through help of the experimental heat capacities of CoCl_2.6H_2O at the low temperatures in a semi-empirical way. This result gives the exchange interactions |J|/k=10.8°K in the direction of the chain of the coordinated Co^<2+> ions and |J'|/k=2.03°K between Co^<2+> ions in the neighboring chains. The total entropy of the transition is 1.39cal/deg mole and about 37% of this is acquired in the temperature region above 17.20°K.

• 社団法人日本物理学会の論文
• 1964-09-05

著者

• SHINODA Takako

  Department of Microbiology, Meiji College of Pharmacy

• Shinoda Takako

  Department Of Chemistry Faculity Of Science Osaka University

• SEKI Syuzo

  Department of Chemistry, Faculty of Science, University of Osaka

• Seki Syuzo

  Department Of Chemistry Faculity Of Science Osaka University

• CHIHARA Hideaki

  Department of Chemistry, Faculity of Science, Osaka University

• Chihara Hideaki

  Department Of Chemistry Faculity Of Science Osaka University

• Chihara Hideaki

  Department Of Chemistr Faculty Of Science Osaka University

• Seki Syûzô

  Department of Chemistry and Chemical Thermodynamics Laboratory, Faculty of Science, Osaka University

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