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Thermodynamics of a ferroelastic phase transition

Saunders, G., Comins, J., MacDonald, John Emyr 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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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: 04 Jun 2017 04:54

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