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'Mixed Valence' in keywords Facet   Publication Year 1999  [X]
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1999[X]
1Author    Wolfgang Jeitschko, HorstA. Mons, Ute Ch, RodewaldRequires cookie*
 Title    Preparation and Crystal Structure of the Calcium Rhenate(VI, VII) Ca5Re30 15.x  
 Abstract    The title compound was prepared by reaction of elemental calcium with the calcium metaper-rhenate Ca(ReC>4)2. Its crystal structure was determined from single-crystal X-ray data: Amm2, a = 560.31 (5)pm, b = 1572.4(1)pm, c = 719.91 (6)pm ,Z = 2 ,R = 0.033 for 930 structure factors and 46 variable parameters. The calcium atoms occupy three atomic sites, all with seven oxygen neighbors. Of the two different rhenium atoms one has square-pyramidal oxygen coordination with an average oxidation number +6.25. The other rhenium site (oxidation number +7) was refined as a split position with trigonal-bipyramidal (75%) and tetrahedral oxygen coordination (25%). One oxygen site remains unoccupied, whenever the tetrahedral rhenium site is occupied, resulting in the composition Ca5Re3 0 i4.75. A test for superconductivity of this black compound down to 1.5 K was negative. 
  Reference    Z. Naturforsch. 54b, 1483—1488 (1999); received August 16 1999 
  Published    1999 
  Keywords    Crystal Structure, Mixed Valence, Rhenates, Perrhenates 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1483.pdf 
 Identifier    ZNB-1999-54b-1483 
 Volume    54