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1Author    Y. Waseda, K. Shinoda, K. SugiyamaRequires cookie*
 Abstract    a tio n D is tr ib u tio n o f Z n F e 20 4 a n d C o F e 20 4 S p in e ls F r o m A n o m a lo u s X -R a y S c a tte r in g The distribution of Zn2 + and Co2 + cations in ferrite spinels has been determined by applying anomalous X-ray scattering (AXS) near the K absorption edges of Fe, Co and Zn. The energy dependence of the reflection intensities of ZnFe20 4, detected at the Fe K and Zn K absorption edges, can only be explained when all Zn2+ being allocated to the tetrahedral site formed by oxygens. On the other hand, the results for CoFe20 4 suggest that 78% of Co2+ occupy the octahedral site, and that the present CoFe20 4 sample is classified as inverse spinel, although a partial disorder is included. The usefulness of this AXS method coupled with the common Rietveld analysis was well-recognized by determining the cation distribution even in a system with next neighboring elements of the periodic table. 
  Reference    Z. Naturforsch. 50a, 1199—1204 (1995); received November 6 1995 
  Published    1995 
  Keywords    Anomalous X-ray scattering, Rietveld, Synchrotron radiation, Ferrite, Spinel, ZnFe20 4, CoFe20 4 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-1199.pdf 
 Identifier    ZNA-1995-50a-1199 
 Volume    50 
2Author    M. Bionducci, F. Buffa, G. Licheri, G. Navarra, B. Bouchet-Fabre, J. M. TonnerreRequires cookie*
 Title    Determination of the Partial Structure Factors of Amorphous CuZr by Anomalous X-Ray Scattering and Reverse Monte Carlo  
 Abstract    Anomalous X-ray Scattering experiments have been performed to study the local order in an amorphous CuZr sample prepared by mechanical alloying. The three partial structure factors were extracted both using a regularization algorithm to solve an ill-conditioned system of linear equations and applying the reverse Monte Carlo technique to the experimental data. Then the short range atomic distributions of similar samples prepared by different methods and investigated by different techniques are compared. 
  Reference    Z. Naturforsch. 51a, 71—82 (1996); received November 15 1995 
  Published    1996 
  Keywords    Amorphous Alloys, Anomalous X-ray Scattering, Regularization Algorithm, Reverse Monte Carlo, Partial Structure Factors 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0071.pdf 
 Identifier    ZNA-1996-51a-0071 
 Volume    51 
3Author    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