Disorder of BeF_4 in the Normal Phase of (NH_4)_2BeF_4
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概要
- 論文の詳細を見る
The crystal structure of (NH.).BeF. has been investigated at several tem-peratures by X-ray diffraction with particular interest to the temperature de-pendence of temperature factors. It is revealed that the mean-square thermalamplitudes U.3's for F(2) and F(3) and U.. for FBI) are not proportional toabsolute temperature in the normal (N) phase. This is understood by assumingthe disorder of F atoms, or of BeF. groups. The phase transition to the ferro-electric (F) phase is characterized by the order of BCF4 groups.
- 社団法人日本物理学会の論文
- 1985-04-15
著者
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OZAWA Takahiro
Department of Animal Science, Obihiro University of Agriculture and Veterinary Medicine
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Yamada Nobuyoshi
Department Of Applied Physics And Chemistry University Of Electro-communications
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Ikeda T
Department Of Physics Chuo University
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Yamada N
Department Of Applied Physics And Chemistry The University Of Electro-communications
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Yamada Noboru
Department Of Applied Physics Faculty Of Engineering Tohoku University
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Ikeda Takuro
Department Of Applied Physics Faculty Engineering Tohoku University
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Ozawa Takashi
Department Of Applied Physics Faculty Of Engineering Tohoku University
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Ozawa Takashi
Departmant Of Chemistry Faculty Of Engineering Shibaura Institute Of Technology
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Yamada Noboru
Department of Applied Physics and Chemistry, The University of Electro-Communications
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