Phenomenological theory of the reconstructive phase transition between the NaCl and CsCl structure types

Toledano, P., Knorr, K., Ehm, L. and Depmeier, W. (2003) Phenomenological theory of the reconstructive phase transition between the NaCl and CsCl structure types Physical Review B, 67 (14). DOI 14410610.1103/PhysRevB.67.144106.

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Abstract

A phenomenological model of the reconstructive transformation between the NaCl and CsCl structure types is described. It consists of two consecutive displacive mechanisms, coupled to tensile and shear strains. These mechanisms give rise to intermediate orthorhombic structures, including the B16 and B33 structure types. The model is shown to explain consistently the experimental observations in different groups of binary compounds as monochalcogenides, monopnictides, and monohalides. The isostructural transitions found in rare-earth chalcogenides are interpreted by the coupling of the displacive order parameters to the change in compressibility related to the valence transitions. The previous models proposed for the NaCl-CsCl transformation are critically analyzed.

Document Type: Article
Keywords: x-ray-diffraction order-parameter symmetries high-pressure preferred orientation 25 gpa transformation state snse csi monochalcogenides
Research affiliation: Kiel University
DOI etc.: 14410610.1103/PhysRevB.67.144106
ISSN: 1098-0121
Date Deposited: 24 Jan 2012 06:33
Last Modified: 08 Oct 2012 10:35
URI: http://eprints.uni-kiel.de/id/eprint/16220

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