Structures of cesium containing fluorides, VI: The pyrochlore-related layer structures of Cs4CoCr4F18 and Cs4Cr5F18+x
作者： G. Courbion , R. De Pape , G. Knoke , D. Babel
DOI: 10.1016/S0022-4596(83)80013-9
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摘要: The crystal structures of the hexagonal compounds Cs 4 CoCr F 18 ( a = 720.3, c 1076.1 pm) and Cr 5 18,24 720.0, 1067.9 pm), both crystallizing in space group P 3 m 1, Z have been determined R g 0.041 0.045, respectively). They exhibit new triple layer arrangement octahedra, which has composition M derives from RbNiCrF 6 -type pyrochlore structure. overall average distances are -F 192.9 192.0 pm for Co(II) Cr(II) compound, respectively, smaller value latter being mainly due to higher Cr(III) portion it. compensating anion excess is located its influence discussed, as well evidence on distribution (II) (III) ions lattice sites, including some hints presence Jahn-Teller distortion compound.
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