The phases formed by the dehydration of disodium zirconium(IV) bis(orthophosphate) trihydrate and their ion-exchange behavior.
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概要
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The phase transformation of Na<SUB>2</SUB>Zr(PO<SUB>4</SUB>)<SUB>2</SUB>·3H<SUB>2</SUB>O which had been obtained from zirconium(IV) bis(hydrogenphosphate) monohydrate(α-zirconium phosphate), prepared by the direct precipitation method, was studied by means of gravimetry, X-ray analysis, and acid-base titration. When the material was heated for 2 d, it was transformed to a monohydrate at 80 °C and then successively to three anhydrous phases, depending on the temperature. The monohydrate was also formed by letting the trihydrate stand over P<SUB>2</SUB>O<SUB>5</SUB> at room temperature for longer than two weeks. The processes were confirmed to be irreversible by an examination of the rehydration behavior, from which the conditions of the storage of five modifications of disodium zirconium(IV) bis(orthophosphate) were established. It is of special interest that the second anhydrous phase reverted to the first one when it was allowed to stand at room temperature in air or in a desiccator. The rate of the reversion decreased with the temperature of heat-treatment and with a decrease in the relative humidity of the surroundings. The difference between the present results and Clearfield's was clarified and attributed mainly to the difference in the crystallinity of the starting α-zirconium phosphate.
- 公益社団法人 日本化学会の論文
著者
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Inoue Yasushi
Department of Applied Physics, Osaka University
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Yamada Yoshimune
Department of Nuclear Engineering, Faculty of Engineering, Tohoku University
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