Dielectric Studies of NaNH_4(SO_4)_<1-x>(SeO_4)_x・2H_2O on the Phase Transition

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概要

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• Dielectric constants of a NaNH_4(SO_4)_<1-x> (SeO_4)_x・ 2H_2O system along the c axis under stress-free and clamped conditions were measured in a temperature range from -210℃ to 30℃. Examinations of the pyroelectric current were also carried out. The dielectric constants under stress-free and clamped conditions followed the Curie-Weiss law above the phase transition temperature. It was therefore suggested that the phase transition of the NaNH_4(SO_4)_<1-x>(SeO_4)_x・2H_2O system is caused predominantly by dielectric instability. A phase diagram of the NaNH_4(SO_4)_<1-x>(SeO_4)_x・2H_2O system was established from the results of dielectric measurements. It was found that the phase transition temperature of the NaNH_4(SO_4)_<1-x>(SeO_4)_x・2H_2O system exhibits a minimum value of -200℃ at x=0.3. The space group in the ferroelectric phase of NaNH_4SO_4・2H_2O was identified to be P2_1 from the phase diagram.

• 社団法人日本物理学会の論文
• 1993-12-15

著者

• Arai Masazumi

  Kyushu University

• KOMUKAE Masaru

  Department of Applied Physics, Faculty of Science, Science University of Tokyo

• OSAKA Toshio

  Department of Applied Physics, Faculty of Science, Science University of Tokyo

• Arai M

  Computational Materials Science Center National Institute For Materials Science

• Osaka T

  Tokyo Univ. Sci. Tokyo

• Osaka Toshio

  Department Of Applied Physics Faculty Of Science Tokyo University Of Science

• Osaka Toshio

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo

• Komukae M

  Tokyo Univ. Sci. Tokyo

• Komukae Masaru

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo

• MAKITA Yasuharu

  Department of Applied Physics,Faculty of Science,Science University of Tokyo

• Irokawa Katsumi

  Department of Applied Physics, Faculty of Science, Science University of Tokyo

• Komukae M

  Department Of Applied Physics Faculty Of Science Tokyo University Of Science

• Irokawa Katsumi

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo

• Arai Masatoshi

  Physics Department Tohoku University:argonne National Loboratory

• Ono H

  Setsunan Univ. Osaka

• Miyazaki A

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo

• Miyazaki Akio

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo:chiba High School

• Ono Hiroyo

  Department of Applied Physics, Faculty of Science, Science University of Tokyo

• Ono Hiroyo

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo

• Makita Yasuharu

  Department Of Applied Physics Faculty Of Science Science University Of Tokyo

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