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1996 (1)
1Author    Lithiumteilstruktur Von Lithiumnitridtribromid, Und Li6nbr3, Lithiumnitridtriiodid, Li6ni3, Rupert Marx3, Hans Michael, M. AyerbRequires cookie*
 Title    Darstellung und  
 Abstract    Single phase Li6N Br3 was prepared by the reaction of Li3N and dry, OH-free LiBr at 450°C. It is the most bromide rich com pound in the quasi binary system Li3_2.vN 1_*Brv. The crystal structures o f Li6N Br3 and o f isotypic Li6NI3, have been redetermined from neutron powder diffraction data. Both compounds crystallize in the cubic space group Fm3m (No. 225), a(Li6N Br3) = 894.18(7), a(Li6N I3) = 951.7(1) pm with 4 formula units per unit cell. The anion sublattice comprises a rock salt like arrangement of N with one o f the three halogen atoms (H a ll), with the remaining halogen atoms in the resulting N4Hal4 cubes. The structure may be regarded as an ordered A X 3 variation of a body-centered packing. The lithium atoms are disordered over the 96 (distorted) tetrahedral N X 3 holes in such a way that of the four neighbouring, face-sharing NBr3 tetrahedra along an N -H all-connection line only one is occupied. The resulting Li coordination polyhedron around N (and H a ll) is a distorted octa­ hedron with 6 equidistant Li atoms. Hal2 is surrounded by 12 Li atoms. The Li6NHal3 struc­ ture may be regarded as an anti-form of the cryolite structure. 
  Reference    Z. Naturforsch. 51b, 525 (1996); eingegangen am 17. Juli 1995 
  Published    1996 
  Keywords    Lithium Nitride Trihalogenide, Preparation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0525.pdf 
 Identifier    ZNB-1996-51b-0525 
 Volume    51