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    • A synthetic iron phosphate mineral, spheniscidite, [NH4]+[Fe2(OH)(H2O)(PO4)2]−H2O, exhibiting reversible dehydration

      Amitava Choudhury Srinivasan Natarajan

      Inorganic And Analytical Volume 111 Issue 5 October 1999 pp 627-637

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      https://www.ias.ac.in/article/fulltext/jcsc/111/05/0627-0637

    • Keywords

       

      Open-framework materials; adsorption; reversible dehydration; antiferromagnetism; structure-directing agents

    • Abstract

       

      Spheniscidite, a synthetic iron phosphate mineral has been synthesized by hydrothermal methods. The material is isotypic with another iron phosphate mineral, leucophosphite. Spheniscidite crystallizes in the monoclinic spacegroupP21/n. (a=9·845(1),b=9·771(3),c=9·897(1),β=102·9°,V=928·5(1),Z=4,M=372·2,dcalc=2·02 g cm−3 andR=0·02). The structure consists of a network of FeO6 octahedra vertex-linked with PO4 tetrahedra forming 8-membered one-dimensional channels in which the NH4+ ions and H2O molecules are located. The material exhibits reversible dehydration and good adsorption behaviour. Magnetic susceptibility measurements indicate that the solid orders antiferromagnetically.

    • Author Affiliations

       

      Amitava Choudhury1 2 Srinivasan Natarajan1

      1. Jawaharlal Nehru Centre for Advanced Scientific Research, Chemistry and Physics of Materials Unit, Jakkur PO, Bangalore - 560 064, India
      2. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore - 560 012, India

    • Dates

       
      Published
      October 1999
      Manuscript received
      16 April 1999

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