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'High Pressure Synthesis' in keywords Facet   Publication Year 1993  [X]
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1Author    Klaus-Jürgen Range, Alexandra AtzesdorferRequires cookie*
 Title    Ein Orthoperrhenat mit flächenverknüpften R e 0 6-0ktaedern: Hochdrucksynthese und Kristallstruktur von K3NaRe20 9 An Orthoperrhenate with Face-Sharing R e 0 6 Octahedra: High-Pressure Synthesis and Crystal Structure of K 3N aR e20 9  
 Abstract    The title com pound was prepared by high-pres­ sure reaction of rhenium metal with technical grade (i.e., N a containing) K O , in a modified Belt-type apparatus (20 kbar, 1Ö00 °C, 60 min, Au capsule). The amber-coloured crystals are very hygroscopic and decompose rapidly when exposed to air. K 3N aR e20 9 crystallizes hexago-nally, space group P 63/mmc, with a = 6.012(1), c = 14.342(14)Ä, c/a = 2.386 and Z = 2. The structure was refined to R = 0.031, R w = 0.023 for 422 independent, absorption-corrected reflections with l> a (I). K 3N aR e20 9 is isostructural with 6 H -B a T i0 3, a perowskite variant, and contains Na and Re in octaedral coordination. Two R e 0 6 octahedra are face-sharing, thus creating a Re20 9 double octahedron with a R e -R e distance of 2.92Ä. 
  Reference    Z. Naturforsch. 48b, 237—239 (1993); eingegangen am 30. September 1992 
  Published    1993 
  Keywords    Tripotassium Sodium D iorthoperrhenate, High-Pressure Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0237_n.pdf 
 Identifier    ZNB-1993-48b-0237_n 
 Volume    48