| | 1 | Author
| Na, Cufef, S. Kummer, W. Massa, D. Babel | Requires cookie* | | | Title
| Zur Struktur der Kupfer-Weberite Na 2 CuCrF 7 Concerning the Structures of the Copper Weberites Na 2 CuCrF 7 and Na 2 CuFeF 7  | | | | Abstract
| The crystal structure of the compound Na 2 CuCrF 7 (orthorhombic, a = 710.0, b = 1033.8, c = 751.8 pm, Z = 4) was refined in space group Pmnb to R (= 0.028 (1545 independent reflections). The Jahn-Teller distortion of the CuF 6 -octahedra (Cu-F = 191.1/193.8/212.4 pm. mean 199.1 pm) reduces the symmetry compared to the body-centered orthorhombic weberite type, to which it is otherwise closely related. The CrF 6 -octahedra. interconnecting parallel chains of CuF 6 -octahedra, are nearly undistorted (mean Cr-F = 190.6 pm). Na 2 CuFeF 7 exhibits a supercell with a different structure (monoclinic, a = 2468.7, b = 734.7, c = 1245.2 pm, ß = 99.29°, Z = 16). It may be interpreted as a new intermediate type between orthorhombic and trigonal weberites. Preliminary results obtained from refinement in space group A2/n (/? g = 0.076) are given and discussed (mean values Cu—F = 199 pm, Fe — F = 192 pm). | | | |
Reference
| Z. Naturforsch. 43b, 694—701 (1988); eingegangen am 9. Februar 1988 | | | |
Published
| 1988 | | | |
Keywords
| Crystal Structure, Weberite, Copper Fluoro Compounds | | | |
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| default:Reihe_B/43/ZNB-1988-43b-0694.pdf | | | | Identifier
| ZNB-1988-43b-0694 | | | | Volume
| 43 | |
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