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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Bismayer, Ulrich / Boldyreva, Elena V. / Huppertz, Hubert / Petrícek, Václav / Tiekink, E. R. T.


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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

Publication History

Published Online:
2010-07-28

Abstract

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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