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'Rare Earth Metal Rhenium Carbides' in keywords
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1997 (1)
1Author    R. Pöttgen, K. H. Wachtmann, W. Jeitschko, A. Lang, T. EbelRequires cookie*
 Title    Er5Re2C7, Tm5Re2C7, and Lu5Re2C7 with Sc5Re2C7 Type, and Yb2ReC2 with Pr2ReC2 Type Structures  
 Abstract    ErsReiCy, TmsRe2C7, and LusReaC? were prepared by arc-melting of the elemental compo­ nents and subsequent annealing at 800 °C. ErsRe^Cy forms only after the annealing process, whereas the other two carbides were already present in the as cast samples. They crystallize with a ScsReiC? type structure, which was refined from single-crystal X-ray data of LusRe2C7: Cmmm, a = 791.44(5), b = 1418.08(8), c = 332.79(2) pm, Z = 2, R = 0.037 for 544 structure factors and 21 variable parameters. The structure contains linear centrosymmetric C3 units with a C-C bond length of 133(2) pm and isolated carbon atoms in octahedral coordination of four lutetium and two rhenium atoms. The rhenium atoms within the two-dimensionally infinite polymeric sheets [ReiC-tln are electronically saturated as is indicated by the diamagnetism and the semiconductivity of this carbide. Yf>2ReC2 was prepared by reacting the elements in a sealed tantalum tube with a high-frequency furnace. It crystallizes with a Pr2ReC2 type structure: Pnma, a = 645.91(6), b = 498.64(6), and c = 966.05(6) pm. Magnetic susceptibility measurements indicate the ytterbium atoms to be trivalent in this compound. 
  Reference    Z. Naturforsch. 52b, 231—236 (1997); received November 15 1996 
  Published    1997 
  Keywords    Crystal Structure, Magnetic Properties, Rare Earth Metal Rhenium Carbides, Polymeric Rhenium-Carbon Polyanions 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0231.pdf 
 Identifier    ZNB-1997-52b-0231 
 Volume    52