Nuclear magnetic resonance in hemihydrate gypsum.
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概要
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The proton spin-lattice relaxation times <I>T</I><SUB>1</SUB> and <I>T</I><SUB>1D</SUB> along the static and dipolar magnetic fields have been measured at 18 MHz for the water molecule in powdered hemihydrate gypsum CaSO<SUB>4</SUB>·(1/2)H<SUB>2</SUB>O. The minima of <I>T</I><SUB>1</SUB> and <I>T</I><SUB>1D</SUB> were observed at 10<SUP>3</SUP>⁄<I>T</I>=4.3(233 K) and 7.0(143 K) respectively. These are ascribed to the 180° flip motion of water molecules, with an activation energy of 15.1 kJ/mol. At higher temperatures, the translational diffusion of water molecules becomes dominant; this is not observed in gypsum CaSO<SUB>4</SUB>·2H<SUB>2</SUB>O. The activation energy of this motion is estimated to be 32.2 kJ/mol. In hemihydrate gypsum, though the diffusion is supposed to be anisotropic, the jumping distance of the water molecule is tentatively examined by Torrey's lattice diffusion theory.
- 公益社団法人 日本化学会の論文
著者
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Shimomura Kenji
Department Of Physics Faculty Of General Education Hiroshima University
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Yoshida Makoto
Department Of Biology Faculty Of Science University Of Kochi
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Negita Hisao
Department Of Chemistry Faculty Of Science Hiroshima University
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Sanjoh Akira
Department of Chemistry, Faculty of Science, Hiroshima University
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Nagashima Toshikazu
Ube Research Center, Central Glass Co., Ltd.
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Shimomura Kenji
Department of Physics, Faculty of Integrated Arts and Sciences, Hiroshima University
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