Volume 65, Number 3, February 2004
|Page(s)||358 - 364|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 January 2004|
Lifshitz-point instabilities and re-entrant incommensurability in
Institute of Geosciences, Crystallography, University of Kiel Olshausenstraße 40, 24098 Kiel, Germany
2 Group “Structure of Materials under Extreme Conditions” SNBL/ESRF 38043 Grenoble Cedex, France
Accepted: 21 November 2003
The concentration-induced sequence of three incommensurate phases (ϵ, , ) previously disclosed in x are interpreted as resulting from distinct Lifshitz-invariant and Lifshitz-points instabilities. When varying the temperature, the ϵ phase displays a re-entrant behavior, which is described as a folding of the high-temperature region triggered by the ordering of the lithium ions.
PACS: 64.60.-i – General studies of phase transitions
© EDP Sciences, 2004
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