Study of Thermal Expansion of NaNO_2 with Special Emphasis on the Vicinity of the Transition Points
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概要
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By use of a capacitance method, the thermal expansions of NaNO_2 (T_c=163.9℃, T_N=165.2℃) along the a-, b- and c-axes were measured from -180℃ to 240℃ with the accuracy of 1×10^<-6> cm in Δl. Anomalies associated with the phase transitions were observed over the wide temperature range 100 to 200℃. The thermal expansion showed a distinct jump at T_c., and the thermal expansion coefficient exhibited a divergent character near T_N. The critical exponents were found to be 0.34∼0.36 for T>T_N and 0.09∼0.20 for T<T_N. These agree very well with those of the specific heat. It was revealed that the Neel temperature determined by the analysis of the thermal expansion data lies 0.1∼0.2 deg below the peak position of the dielectric constant. The pressure dependences of the transition points deduced from the Clausius-Clapeyron equation and the Pippard equation were found to agree with the result of the hydrostatic pressure experiment.
- 社団法人日本物理学会の論文
- 1975-09-15
著者
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EMA Kenji
Department of Physics,Faculty of Science,Tokyo Institute of Technology
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HAMANO Katsumi
Department of Physics,Faculty of Science,Tokyo Institute of Technology
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HATTA Ichiro
Department of Applied Physics, Nagoya University
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Hatta Ichiro
Department Of Applied Physics Faculty Of Engineering Nagoya University
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Ema K
Graduate School Of Science And Engineering Tokyo Institute Of Technology
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Ema Kenji
Department Of Physics Faculty Of Science Tokyo Institute Of Technology
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Hamano Katsumi
Department Of Physics College Of Science Tokyo Institute Of Technology
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Ema Kenji
Department of Organic Synthesis, Kyushu University
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