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'Ternary Nitride' in keywords Facet   Publication Year 1998  [X]
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1Author    Rainer Niewa3, GrigoriV. Vajenine3, FrancisJ. Disalvo, Haihua Luob, WilliamB. YelonbRequires cookie*
 Title    Unusual Bonding in Ternary Nitrides: Preparation, Structure and Properties of Ce2MnN3  
 Abstract    CeiMnNj was prepared by reaction of cerium nitride and manganese with nitrogen gas at 900 °C. It crystallizes isotypic to AC2MN3 (Ac = U, Th; M = Cr, Mn) and Ce^CrN^, space group Immm (No. 71), a = 3.74994(6) A, b = 3.44450(6) A and c = 12.4601(2) A. The manganese atoms are coordinated in a nearly square planar fashion by four nitrogen atoms. These corner-connected MnN* units form infinite J. [MnN2N2/ 2 ] chains, which run parallel to each other along the crystallographic a-axis, forming the motif of hexagonal rod packing. Cerium atoms connect the chains into a three-dimensional network. The results of measurements of the magnetic susceptibility, as well as of the electrical resistivity suggest metallic behavior. Electronic effects leading to shorter bonds between manganese and bridging nitrogen atoms than between manganese and terminal nitrogen atoms in the J. [MnN2N2/ 2 ] chains were investigated through extended Hiickel and LMTO band structure calculations. Issues pertaining to stability of this and some other nitridometallate structures are discussed. 
  Reference    (Z. Naturforsch. 53b, 63—74 [1998]; received September 17 1997) 
  Published    1998 
  Keywords    Ternary Nitride, Crystal Structure, Magnetic Susceptibility, Electrical Resistivity, Extended Hiickel Method 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0063.pdf 
 Identifier    ZNB-1998-53b-0063 
 Volume    53