Synthesis and thermal reactions of rhabdophane-(Y)

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Abstract

Syntheses of rhabdophane-(Y) (hexagonal YPO<SUB>4</SUB>·nH<SUB>2</SUB>O (n=0.5 to 1) were carried out by precipitation from aqueous solutions of Y(NO<SUB>3</SUB>)<SUB>3</SUB>·6H<SUB>2</SUB>O, (NH<SUB>4</SUB>)2HPO<SUB>4</SUB> and citric acid with the mixing mole ratios of (NH<SUB>4</SUB>)2HPO<SUB>4</SUB>/Y(NO<SUB>3</SUB>)<SUB>3</SUB>·6H<SUB>2</SUB>O=4 and citric acid/Y(NO<SUB>3</SUB>)<SUB>3</SUB>·6H<SUB>2</SUB>O (C/Y)=5 to 30. Rhabdophane was obtained when those solutions were maintained at 90°C in the pH range 3 to 7 for 1 day to 30 days. Chemical formula and lattice constants of the well crystallized single phase rhabdophane obtained by the reaction at pH 7 and C/Y ratio 30 for 30 days were YPO<SUB>4</SUB>·0.6H<SUB>2</SUB>O, a=0.683 nm and c=0.630 nm, respectively. The hydrated rhabdophane was dehydrated at 180° to 250°C in air. Thereafter, no significant changes in crystal structure were seen up to 800°C. The water corresponding to 0.6H<SUB>2</SUB>O was zeolitic water. Anhydrous rhabdophane gradually changed to the xenotime structure above 900°C in air.

Journal

  • Mineralogical Journal

    Mineralogical Journal 18(3), 87-96, 1996-07-01

    Japan Association of Mineralogical Sciences

References:  9

Cited by:  1

Codes

  • NII Article ID (NAID)
    10008772655
  • NII NACSIS-CAT ID (NCID)
    AA00739590
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    05442540
  • Data Source
    CJP  CJPref  J-STAGE 
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