Thermal Properties of NaNO_2

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概要

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• Specific heat and thermal expansion coefficients of NaNO_2 crystal were measured from room temperature to 210℃. A conduction-type calorimeter was adopted for the measurement of the specific heat and adifferential-type dilatometer for the measurement of the thermal dilatation. A λ-type anomaly in specific heat was observed near the transition temperature, the transition heat being calculated as ca 285 cal/mol. The crystal expands in the a and b direction, while it contracts in the c direction with increasing the temperature, and further the transition is accompanied by abrupt changes in the cell dimensions. Our results on thermal dilatation were compared with the ones obtained from the x-ray data. Ferroelectricity in NaNO_2 was discussed in connection with our results on thermal properties.

• 社団法人日本物理学会の論文
• 1961-07-05

著者

• Nomura Shoichiro

  Physics Department Tokyo Institute Of Technology

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