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1997 (1)
1Author    Kozo Shinoda, Eiichiro Matsubara, Masatoshi Saito, Yoshio Waseda, Tetsuji Hirato, Yasuhiro AwakuraRequires cookie*
 Title    Structural Study of Poly-Molybdate Ions in Acid Mo-Ni Aqueous Solutions  
 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 Mo0 6 octahedra. In a solution containing both Mo and Ni ions, there exists another poly-molybdate ion consisting of 6 edge-sharing MoO & 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. 
  Reference    Z. Naturforsch. 52a, 855—862 (1997); received November 10 1997 
  Published    1997 
  Keywords    Anomalous X-ray Scattering, EXAFS, Mo-Ni Alloy Electroplating, Aqueous Solution, Poly-molybdate Ion 
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 TEI-XML for    default:Reihe_A/52/ZNA-1997-52a-0855.pdf 
 Identifier    ZNA-1997-52a-0855 
 Volume    52