Sequential re-arrangement of V2O5-layers during the paraelastic-to-ferroelastic phase transition in epsilon '-LixV2O5

Katzke, H. (2001) Sequential re-arrangement of V2O5-layers during the paraelastic-to-ferroelastic phase transition in epsilon '-LixV2O5 Zeitschrift Fur Kristallographie, 216 (5). pp. 278-283. DOI 10.1524/zkri.216.5.278.20372.

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Abstract

The paraelastic-to-ferroelastic phase transition in the lithium vanadium oxide bronze epsilon (1)-Li0.527V2O5 was studied by low-temperature, high-resolution Guinier diffractometry. At the transition the symmetry changes from orthorhombic Pmmn to monoclinic P2(1)/m11 at T-c = 285(5) K. At all temperatures anisotropic broadening of the reflections occurs, indicating the presence of stacking faults in this laver structure. X-ray intensity calculations in terms of a one-dimensional model of stacking disorder were carried out in order to elucidate the structural changes induced by the phase transition, and to determine the critical behaviour of the order parameter Q. The symmetry relations between the Pmmn and P2(1)/m11 phases allow the development of the spontaneous strain which is, in this system, proportional to the change in cos alpha. A bilinear coupling between e(s) and Q was found.

Document Type: Article
Keywords: dimensionally disordered lixv2o5 intensity distribution epsilon'li0.620(3)v2o5 temperature chemistry
Research affiliation: Kiel University
DOI etc.: 10.1524/zkri.216.5.278.20372
ISSN: 0044-2968
Date Deposited: 02 Feb 2012 07:27
Last Modified: 08 Oct 2012 10:39
URI: http://eprints.uni-kiel.de/id/eprint/16288

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