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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Boldyreva, Elena V. / Friese, Karen / Huppertz, Hubert / Jahn, Sandro / Tiekink, E. R. T.

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Volume 198, Issue 1-2

Issues

Verfeinerung der Kristallstrukturen von Ta5As4 und monoklinem Nb4.7Te4

Richard Dronskowski / Arndt Simon / Peer Plambeck-Fischer
Published Online: 2010-08-25 | DOI: https://doi.org/10.1524/zkri.1992.198.1-2.101

Abstract

The crystal structure of Ta5As4 has been refined on the basis of single crystal data. Ta5As4 is isotypic with Ti5Te4, space group I4/mC4h5 (No. 87). The lattice constants are a = 979.75(4) pm and c = 342.96(4) pm.

Besides the known tetragonal modification a new monoclinic form of “Nb5Te4” has been synthesized by means of a chemical transport reaction. Chemical analysis and crystallographic refinement lead to a composition Nb4.7Te4. A single crystal structure analysis showed space group C2/mC2h3 (No. 12) with a = 1444.3(7) pm, b = 369.6(1) pm, c = 1013.2(5) pm and β = 134.47(3)°. One Nb position is only 85% occupied, Guinier photographs indicate a small homogeneity range.

It is proposed that the earlier described monoclinic β-V5Te4 is isotypic with Nb4.7Te4, although space group choices Cc or C2/c were made in the latter case.

About the article

Published Online: 2010-08-25

Published in Print: 1992


Citation Information: Zeitschrift für Kristallographie, Volume 198, Issue 1-2, Pages 101–110, ISSN (Online) 0044-2968, ISSN (Print) 1433-7266, DOI: https://doi.org/10.1524/zkri.1992.198.1-2.101.

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