Thermodynamics of a ferroelastic phase transition

Saunders, G., Comins, J., MacDonald, John Emyr ORCID: https://orcid.org/0000-0001-5504-1692 and Saunders, E. 1986. Thermodynamics of a ferroelastic phase transition. Physical Review B 34 (3) , pp. 2064-2066. 10.1103/PhysRevB.34.2064

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Abstract

The elastic-strain-energy contribution to the thermodynamic potential of a crystal in the close vicinity of a ferroelastic transition has been determined for a fcc indium-23-at-thallium alloy from elastic stiffness tensor data. The potential plotted as a function of the strain order parameter has a second minimum at ηmin=+0.012, predicting a c/a ratio (≃ηmin+1) for the fct form below Tc close to that (1.017 ± 0.004) measured, validating treatment of this transition as purely ferroelastic. dTc/dP has been measured as + 11.8 ± 1.3 K/108 Pa, and the effect of hydrostatic pressure in stabilizing the fct phase has been established. The volume (ΔV/V=-2.7×10-5) and entropy (+ 230 N m-2K-1) differences between the two phases are very small.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Physical Society
ISSN:	0163-1829
Last Modified:	24 Oct 2022 10:53
URI:	https://orca.cardiff.ac.uk/id/eprint/46292

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