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Zeitschrift für Kristallographie - Crystalline Materials

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Synthese und Kristallstruktur von Te8O10(PO4)4

Helmut Mayer / G. Pupp

Citation Information: Zeitschrift für Kristallographie - Crystalline Materials. Volume 145, Issue 5-6, Pages 321–333, ISSN (Online) 2196-7105, ISSN (Print) 2194-4946, DOI: 10.1524/zkri.1977.145.5-6.321, July 2010

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Octatellurium(IV)decaoxide tetraorthophosphate, Te8O10(PO4)4, has been synthesized for the first time. Single crystals of the compound have been obtained from the oxides TeO2 and P2O5 by chemical transport reaction at 550°C. The crystals are monoclinic, space group P21/n, with a = 20.076, b = 4.650, c = 11.220 Å, β = 92.99° and Z = 2. The crystal structure has been determined by direct methods using three-dimensional x-ray diffraction data and refined by a least-squares method to R = 4.9%. The crystal structure comprises “Zweier-Dreifachketten” (triple chain) 31[Te6O10]4+ (average Te–O distances 1.954 Å) which are connected with an other tellurium atom over the terminal oxygen atoms (Te–O = 1.896 Å). The tellurium atom, itself, is strongly bonded to three orthophosphate groups by covalent Te–O(→P) bonds (1.945, 2.092, 2.104 Å). This leads to band-like structural units [Te6O10] [Te(PO4)2]2, which are connected with each other over the non-bonded oxygen atoms of the orthophosphat groups thus forming puckered layers [Te–O(→P) = 2.201, 2.288 Å]. The layers themselves are held together by weak interaction between the oxygen atoms of the orthophosphate groups and the tellurium atoms of the adjacent layer [Te…O(→P) = 2.653, 2.870 Å].

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