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Hydrothermal Synthesis and Characterization ofM2Te3O8(M=Mn, Co, Ni, Cu, Zn): A Series of Compounds with the Spiroffite Structure

✍ Scribed by Christopher R. Feger; George L. Schimek; Joseph W. Kolis

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
186 KB
Volume
143
Category
Article
ISSN
0022-4596

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✦ Synopsis

Several compounds isotypic to the mineral spiroffite were obtained as high quality single crystals via hydrothermal reactions. These materials, which have the general formula M 2 Te 3 O 8 , crystallize in the monoclinic space group C2/c and contain divalent transition metal ions and tellurite building blocks. Typical synthetic conditions for the preparation of these materials are 375°°C for 3-5 days in an aqueous NH 4 Cl solution. This structure type is based on slabs containing Te 2 O 6 groups joined by M cations. These Te 2 O 6 groups are made up of two edge-sharing TeO 3Ψ‰1 polyhedra. The metal tellurite slabs are connected to one another through tellurium(IV) atoms, which are coordinated by four oxygen atoms in a regular TeO 4 trigonal bipyramidal configuration. A detailed structural characterization via single crystal X-ray diffraction was performed on four compounds (Co 2 Te 3 O 8 :

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