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1997 (1)
1995 (1)
1Author    Fernando RullRequires cookie*
 Title    R a m a n  
 Abstract    S p e c tro s c o p ic S tu d y o f th e Io n A s s o c ia tio n o f L ith iu m S u lf a te A q u e o u s S o lu tio n s Dedicated to Prof. Hitoshi Ohtaki on the occasion of his 60th birthday A Raman spectroscopic study of Li2S04 aqueous solutions as function of concentration and temperature was performed. The dynamic properties of the sulfate ions were studied by a band profile analysis of their internal modes using Fourier transform methods. This analysis reveals the perturbation of the S04" vibrations due to ionic interactions. From the vt (SO;2) band profile the spectroscopic ionic association constant was calculated in the range from 5 to 80 °C. The large difference found between the values thus obtained for the association constant and the values obtained from macroscopic measurements is interpreted, assuming that Raman spectra reflect only the short-range forces acting on the ions. Using the Bjerrum equation to calculate the contribution for the long-range forces, good agreement is found between the spectroscopic and macroscopic results. 
  Reference    Z. Naturforsch. 50a, 292—300 (1995); received November 29 1994 
  Published    1995 
  Keywords    Raman spectra, Lithium sulfate, Aqueous solutions, Ionic association, Band profile 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0292.pdf 
 Identifier    ZNA-1995-50a-0292 
 Volume    50 
2Author    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