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The Dodecagonal Quasicrystalline Telluride (Ta, V)1.6Te And Its Crystalline Approximant (TaV)97Te60

Published online by Cambridge University Press:  10 February 2011

C. Reich ,
M. Conrad ,
F. Krumeich  and
B. Harbrecht
C. Reich
Affiliation:
Department of Chemistry and Centre for Materials Sciences, Philipps University, D-35032 Marburg, fkc@chemie.uni-marburg.de
M. Conrad
Affiliation:
Department of Chemistry and Centre for Materials Sciences, Philipps University, D-35032 Marburg, fkc@chemie.uni-marburg.de
F. Krumeich
Affiliation:
Laboratory of Inorganic Chemistry, ETH Zürich, CH-8092 Zürich
B. Harbrecht
Affiliation:
Department of Chemistry and Centre for Materials Sciences, Philipps University, D-35032 Marburg, fkc@chemie.uni-marburg.de
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Abstract

The dodecagonal (dd) quasicrystalline tantalum telluride dd Ta1.6Te and the crystalline approximant Ta97Te60 have been modified by partly replacing tantalum by vanadium. The impact of the substitution on the structures has been studied by X-ray and electron diffraction and by high-resolution transmission electron microscopy. The layered-type approximant structure of Ta83V14Te60 was determined by single crystal X-ray means. The partitioning of vanadium on 21 out of 29 crystallographically inequivalent metal sites is referred to, but not controlled by the Dirichlet domain volume available at the sites. A HRTEM projection of dd (Ta, V)1.6Te onto the dodecagonal plane is analysed with respect to the arrangement of (Ta, V)151Te74 clusters on the vertices of an irregular aperiodic square-triangle tiling, the edge length of which corresponds to the distance between the centres of two such clusters. The clusters comprise about 1 nm thick corrugated lamellae which are periodically stacked by weak Te-Te interactions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 83
Copyright
Copyright © Materials Research Society 1999

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References

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