X-Ray Critical Scattering in NH_4Br
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概要
- 論文の詳細を見る
A detailed observation of X-ray diffuse scattering in CsCl-type NH_4Br has been carried out in order to investigate the property of the microscopic interaction to cause the order-disorder phase transitions in this substance. The experimental results are summarized as follows. (i) Diffuse scattering peaked at the super lattice points has been observed up to 30 K above the critical temperature of the cubic (disordered) to tetragonal phase transition. (ii) The temperature dependence of the diffuse scattering shows a typical feature of critical scattering observed in the process of ordering of various physical quantities. In the present case, the critical scattering is attributed to the correlated fluctuation of displacements of Br^- ions. (iii) The distribution of the diffuse scattering intensity in the reciprocal space is anisotropic, the intensity contours showing an elongation along [110] direction of the cubic unit cell. These experimental results are consistent with the theory^<1)> in which the system is treated as an Ising spin-phonon coupled system.
- 社団法人日本物理学会の論文
- 1972-06-05
著者
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Yamada Y
Tohoku Univ. Sendai Jpn
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Yamada Y
Advanced Research Institute Waseda University:advanced Science Research Center Japan Atomic Energy R
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YAMADA Yasusada
Faculty of Engineering Science,Osaka University
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Noda Yukio
Faculty Of 1engineering Sciences Osaka University
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TERAUCHI Hikaru
Faculty of Science,Kwansei-Gakuin University
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Yamada Y
Hosei Univ. Tokyo
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Yamada Yasusada
Faculty Of Engineering Science Osaka University
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Terauchi Hikaru
Advanced Research Center Of Science School Of Science And Technology Kwansei Gakuin University
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Terauchi Hikaru
Department Of Physics School Of Science Kwansei-gakuin University
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Yamada Yasusada
The Institute For Solid State Physics The University Of Tokyo
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Terauchi Hikaru
Faculty Of Science Kansei Gakuin University
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