and magnetic properties of a 24-membered ring porous nickel(II) phosphate, VSB-1

N Guillou, Q Gao, M Nogues, Russell Edward Morris, M Hervieu, G Férey, AK Cheetham

Research output: Other contribution

144 Citations (Scopus)

Abstract

A large-pore, zeolitic nickel(II) phosphate, VSB-1, has been prepared under hydrothermal conditions. The unidimensional pore system is delineated by 24 NiO6 and PO4 polyhedra and has a free diameter of approximately 9 Angstrom. It becomes microporous on calcination in air at 623 K, yielding a BET surface area of 82 m(2).g(-1), and is stable in air to approximately 823 K. VSB-1 can be prepared in both ammonium and potassium forms, and exhibits ion-exchange properties that lead, for example, to the formation of the lithium and sodium derivatives. Other cations (e.g. Mn, Fe, Co, and Zn) can be substituted for Ni in VSB-1, up to a level as high as 30 atomic %. The parent compound exhibits canted antiferromagnetic order at T-N = 10.5 K with theta = -71 K; on doping with Fe, T-N increases to 20 K and theta decreases to -108 K. (C) 1999 Academie des sciences/Editions scientifiques et medicales Elsevier SAS.

Original languageEnglish
VolumeSirie II
Publication statusPublished - Jul 1999

Keywords

  • zeolites
  • nickel phosphate
  • microporous compounds
  • ion-exchange
  • antiferromagnetism
  • HYDROTHERMAL SYNTHESIS
  • CRYSTAL-STRUCTURE
  • ULM-12
  • PORE

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