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Single crystals of Cu 5 Zn 4 Te 3 O 18  (I), Cu 1.5 Zn 1.5 TeO 6  (II) and Cu 1.5 Co 1.5 TeO 6  (III) have been prepared and investigated by X-ray work. The structure of (I) was solved in the monoclinic space group C 3  2 -C2, a = 14.834(2), b = 8.801(1), c = 10.375(2) Å, β = 93.27(2)°, Z = 4. (II) and (III) crystallize with cubic symmetry, space group T h  7 -Ia3̄, a (II)  = 9.557(1), a (III)  = 9.570(1) Å, Z = 8. (I) shows a complicated structure formed by TeO 6  octahedra isolated from each other, Zn 2 O 6  double tetrahedra and Zn 2 O 8  double square pyramids. These polyhedra are incorporated into a network of edge and corner connected stretched CuO 6  octahedra. (II) and (III) are isotypic to Cu 3 TeO 6  and have a (Cu/M) 3 O 6  octahedra network, statistically occupied by Cu 2+  and Zn 2+  or Cu 2+  and Co 2+ .

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Zur Kristallchemie der Kupfer(II)-ZinkteIlurate Cu 5 Zn 4 Te 3 O 18  und Cu 1,5 Zn 1,5 TeO 6 , mit einer Notiz über Cu 1,5 Co 1,5 TeO 6  / On the Crystal Chemistry of the Copper(II) Zinc Tellurates Cu 5 Zn 4 Te 3 O 18  and Cu 1,5 Zn 1,5 TeO 6  with a Note on Cu 1,5 Co 1,5 TeO 6