Preparation of cubic HZr2(PO4)3 and related compounds.
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概要
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A single phase of cubic NH<SUB>4</SUB>Zr<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB> with a langbeinite-type structure was prepared at 235 °C by a hydrothermal method. A series of analogous compounds containing various monovalent cations or vacancies were made by starting with cubic NH<SUB>4</SUB>Zr<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB>. They are polymorphs with respect to Nasicon-type compounds and have rigid skeleton structures with interstitial spaces partially occupied by monovalent ions and water molecules. Maximum water contents of the cubic compounds decrease with increasing sizes of the monovalent ions. Proton-bearing cubic compound exhibited ion exchange reactions with NaCl and LiCl solutions at 20 °C. This suggests the existence of bottlenecks large enough for permitting diffusion of Na<SUP>+</SUP> and Li<SUP>+</SUP> ions. Low thermal expansion of cubic NaZr<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB> was studied by high-temperature X-ray diffraction.
- 公益社団法人 日本化学会の論文
著者
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Ono Akira
National Institute For Research In Inorganic Materials
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YAJIMA Yoshiyuki
National Institute for Materials Science, Advanced Materials Laboratory
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Yajima Yoshiyuki
National Institute for Research in Inorganic Materials
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