Structural study of poly-molybdate ions in acid Mo-Ni aqueous solutions

Kozo Shinoda, Eiichiro Matsubara, Masatoshi Saito, Yoshio Waseda, Tetsuji Hirato, Yasuhiro Awakura

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13 Citations (Scopus)

Abstract

The atomic structure of poly-molybdate ions formed in acid Ni-Mo aqueous solutions has been determined by applying anomalous X-ray scattering (AXS) and EXAFS methods. In a solution containing only molybdenum ions, we found only a poly-molybdate ion consisting of seven edge-sharing MoO6 octahedra. In a solution containing both Mo and Ni ions, there exists another poly-molybdate ion consisting of 6 edge-sharing MoO6 surrounding an Ni ion. The total coordination number of Mo and Ni ions around a molybdenum ion is reduced by half when introducing citric ions into the Ni and Mo solution. This indicates that the large poly-molybdate ion is decomposed to smaller molybdate ions when forming citric complexes. Since molybdenum-nickel alloys can not be electrodeposited from solutions without citric ions, we propose a view that the structural change of the poly-molybdate ions in the solutions is closely related with the mechanism of induced codeposition of molybdenum and nickel alloy. The results of small-angle X-ray scattering (SAXS) measurements also support this conclusion.

Original languageEnglish
Pages (from-to)855-862
Number of pages8
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume52
Issue number12
DOIs
Publication statusPublished - 1997 Dec

Keywords

  • Anomalous X-ray scattering
  • Aqueous solution
  • EXAFS
  • Mo-Ni alloy electroplating
  • Poly-molybdate ion

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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