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'Yttrium Iodide Carbide Nitride' in keywords Facet   section ZfN Section B  [X]
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1995 (1)
1Author    R. Oland Eger, R. Einhard, K. K. Rem Er, A. Rn, T. SimonRequires cookie*
 Title    Y7 I1 2 C2 N: Eine Verbindung aus Einheiten zweier Y6 (C2)-Oktaeder und eines Y6 N 2-Tetraederdoppels  
 Abstract    Y 7 Ii2C2N: A C om pound with U nits of Two Y 6(C 2) O ctahedra and a Y 6N 2 D ouble T etrahedron H ansjürgen M attausch, H orst B o rrm an n , The new compounds Y7I12C2N and H o7I 12C2N have been prepared by reaction of stoi­ chiometric amounts of the metals (R E), R E I3, REN and C in closed Ta capsules at 1150 and 1120K, respectively. Pure samples of the compounds were obtained after 5 days annealing time. The crystals with xenomorphic shape are olive-green (Y7I12C2N) or red-brown (H o7I I2C2N) in colour and sensitive to air and moisture. Y7I 12C2N crystallizes in the space group P I (No. 2) with lattice constants a = 971.24(7), b = 1030.38(7), c = 1673.58(11) pm and a = 101.366(5), ß = 92.758(5), y = 112.799(5)°. According to Guinier photographs H o7I12C2N is isotypic with the lattice consiants u -968.8(3), b = 1028.7(3), r. = 1667.8(5) pm and a = 101.31(2), ß = 92.78(2), y = 112.80(1)°. In the structure the C atoms are present as C2 units with a C -C distance of 144 pm. These C2 units are octahedrally coordinated by Y atoms (o x). The N atoms are in the center of Y4 tetrahedra, which are linked via a com mon edge to form double tetrahedra (t2). By condensa­ tion of N-centered double tetrahedra (t2) with a C2-centered Y octahedron (01) the character­ istic units Ojt2Oi are formed. The I atom s coordinate all free edges and corners of these units and connect them via I '-I ° contacts parallel [100] and [001]. The compounds are semiconducting. H o7I12C2N exhibits Curie-Weiss behaviour with 6 = 15(1) K and ue({ = 10.5(1) f.iB. 
  Reference    Z. Naturforsch. 50b, 931—936 (1995) 
  Published    1995 
  Keywords    Yttrium Iodide Carbide Nitride, Holmium Iodide Carbide Nitride, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0931.pdf 
 Identifier    ZNB-1995-50b-0931 
 Volume    50