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Atomic ordering in the Laves phases L1 V(Co1–xSix)2 (x = 0.43 and 0.56)

✍ Scribed by Conrad, Matthias; Pohling, Christoph; Webert, Holger; Harbrecht, Bernd


Book ID
120644701
Publisher
Oldenbourg Wissenschaftsverlag
Year
2006
Tongue
English
Weight
294 KB
Volume
221
Category
Article
ISSN
2194-4946

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✦ Synopsis


Abstract

The synthesis, phase relations, and crystal structures of two truly ternary, partially ordered Laves phases occurring in the V—Co—Si system are reported. The phases termed L1 V(Co~1–x~Si~x~)~2~ are found in two distinct phase fields next to TiMnSi-type VCoSi. This so-called E-phase emerges in the centre of the miscibility gap which separates the Co- and Si-rich Laves phase fields. Both fields accommodate several structurally distinct L-phases. The L1-phases V(Co~1–x~Si~x~)~2~ (x = 0.43 and 0.56) crystallise in √3__a__ × √3__a__ superstructures of the hexagonal MgZn~2~ structure type. A rigorous symmetry-based analysis reveals that, at the given compositions, this type of superstructure affords sufficient structural degrees of freedom for ordering of Co and Si atoms on 4 different sites in a manner that enables tuning of hetero-atomic Co—Si interactions to an optimum.


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