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1990 (1)
1Author    Roswitha Schmidt, Brigitte Eisenmann, Rüdiger Kniep, Jürgen Ensling, Philip Gütlich, Reinhard SeidelRequires cookie*
 Title    Zn2(Z n,_;tFe,)Fel" (P 0 4)3 * 2 H 20 : Darstellung, Kristallstruktur und Mößbauer-Untersuchung Zn2(Z n]_ vF ex .)FeIII(P 0 4)3 -2H 20 : Preparation, Crystal Structure and M össbauer Investigation  
 Abstract    Single crystals o f the mixed valency phase Zn2(Z n ,_vF eY)F ein(P0 4)3-2 H20 were grown by hydrothermal treatment o f phosphophyllite (Zn2F e (P 0 4)2-4 H 20) at 160 C in 1 M H3P 0 4. The crystal structure (tricl., P i; a = 641.5(4) pm, b = 914.4(4) pm, c = 983.4(4) pm, a = 70.79(5)°, ß = 78.32(5)°, y = 73.69(5)°; Z = 2) contains P 0 4 tetrahedra, connected via vertices shared with coordination polyhedra o f the metal ions. Cation coordination polyhedra (Fem(Op)5Ow octahedra, (Z n|_vFeY)(O p)5Ow octahedra and Zn(Op)5 trigonal bipyramids) are connected to centrosymmetrical six-membered chains by sharing com m on O -edges. These short chains are interconnected by com m on vertices o f Zn(Op)4 tetrahedra to form infinitive ribbons o f cation coordination polyhedra. The x-values observed for the substitutional posi­ tion (Zn,_A .Fev) varied from .x: = 0.5 (single crystal determ ination) to "y = 1 (Mössbauer investi­ gation). The M össbauer parameters are consistent with high-spin iron in a slightly distorted octahedral environment and valence states (II) and (III). 
  Reference    Z. Naturforsch. 45b, 1255—1261 (1990); eingegangen am 19. April 1990 
  Published    1990 
  Keywords    Orthophosphate Zn/Fe, Mixed Valency C om pound, Hydrothermal Growth, Crystal Structure, Mössbauer Parameters 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1255.pdf 
 Identifier    ZNB-1990-45b-1255 
 Volume    45