Structural mechanisms of the high-pressure phase transitions in the elements of group IVa

Katzke, H. and Toledano, P. (2007) Structural mechanisms of the high-pressure phase transitions in the elements of group IVa Journal of Physics-Condensed Matter, 19 (27). DOI 27520410.1088/0953-8984/19/27/275204.

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Abstract

Displacive mechanisms are proposed for the high-pressure structural transitions which take place in the elements of group IVa. The mechanisms are analysed in the framework of the Landau theory of phase transitions. In carbon the polymorphs are shown to correspond to limit states resulting from critical fractional displacements and critical strains, the corresponding order parameters being defined as periodic functions of the displacements. In Si, Ge, Sn and Pb a number of unifying features are discussed in connection with the electronic structures of these elements.

Document Type: Article
Keywords: crystal-structure metastable phases hexagonal diamond total-energy iii-v silicon graphite germanium lead tin
Research affiliation: Kiel University
DOI etc.: 27520410.1088/0953-8984/19/27/275204
ISSN: 0953-8984
Date Deposited: 12 Jan 2012 05:41
Last Modified: 08 Oct 2012 10:20
URI: http://eprints.uni-kiel.de/id/eprint/15916

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