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'Ternary Carbides with C2 Pairs' in keywords Facet   Publication Year 1996  [X]
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1Author    A. Nne, M. Witte, Wolfgang JeitschkoRequires cookie*
 Title    Preparation and Crystal Structure of the Isotypic Carbides Ln3.67TC6 (Ln = rare earth elements; T = Mn, Fe, Ru) and Eu3 ,i6NiC6  
 Abstract    The 14 carbides Ln367MnC6 (Ln = La-Nd) and Ln367TC6 (Ln = La-Nd, Sm; T = Fe, Ru) were prepared from the elem ental components by arc-melting and subsequent annealing. Eu3 16N iC 6 was obtained from a lithium flux. The crystal structures of these nearly isotypic, hexagonal compounds (P63/m, Z = 2) were determined from single-crystal X-ray data; La3 67. FeC6: a = 878.7(2), c = 535.1(1) pm, R = 0.052 for 548 structure factors and 25 variable parameters; Eu316NiC6: a -860.0(1), c = 548.2(2) pm, R = 0.015 for 606 structure factors and 25 variables. The structures differ from the previously reported Gd3Mn2C6 structure by the occupancy of one manganese position by rare earth atoms. Since the lanthanum atoms are larger than the manganese atoms, only two thirds o f these manganese positions can be occupied by the lanthanum atoms in La3 67FeC6. Eu316NiC6 has similar atomic positions. The C-C bond distances in the C2 pairs are 130(2) and 126.5(5) pm in the La and Eu compounds, respectively. Magnetic susceptibility measurements with a SQ U ID m agnetom eter indicate La3 67FeC6 to be Pauli paramagnetic. A test for superconductivity was negative down to 3 K. 
  Reference    Z. Naturforsch. 51b, 249 (1996); received June 12 1995 
  Published    1996 
  Keywords    Lithium Flux, Crystal Structure, Ternary Carbides with C2 Pairs 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0249.pdf 
 Identifier    ZNB-1996-51b-0249 
 Volume    51