Studies of the hydrous niobium(V) oxide ion exchanger. V. Effect of heat treatment on the sodium isotopic exchange rates between hydrous niobium(V) oxide in Na+ form and aqueous solutions.
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概要
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The effect of a heat treatment was studied on the sodium isotopic exchange rate between the hydrous niobium(V) oxide in the Na<SUP>+</SUP> form and aqueous solutions. The rate was controlled by the particle diffusion of sodium ions and increased with the heat-treatment temperature. The increase in the rate for the exchanger heat-treated at 200 °C was due to a decrease in the effective particle radius brought about by cracks which developed in the particles. A further increase in the rate at temperatures higher than 200 °C could be explained in terms of an increase in the Na<SUP>+</SUP>-diffusion coefficient, which was produced by an increase in the pore size responsinble for the movement of sodium ions.
- 公益社団法人 日本化学会の論文
著者
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Yamazaki Hiromichi
Department Of Neurosurgery Yamanashi Prefectural Central Hospital
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Inoue Yasushi
Department of Applied Physics, Osaka University
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Ikeda Mitsuji
Department of Nuclear Engineering, Faculty of Engineering, Tohoku University
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