Solid-state miscibility gap and thermodynamics of the system BaO–SrO

Jacob, KT and Varghese, Viji (1995) Solid-state miscibility gap and thermodynamics of the system BaO–SrO. In: Journal of Materials Chemistry, 5 (7). pp. 1059-1062.

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Abstract

A solid-state miscibility gap in the pseudo-binary system BaO-SrO is delineated by X-ray diffraction studies on samples equilibrated either in vacuum or under flowing inert gas at temperatures between 1073 and 1423 K. For the SrxBa1-xO solid solution an asymmetric phase boundary, characterized by a critical temperature of 1356 (+/-4) K and composition x=0.55 (+/-0.008), is obtained. Thermodynamic mixing properties of the solid solution, derived from the experimental phase boundary compositions and temperatures, can be represented by the expression: Delta G(E)=x(1-x){33 390-7.09T)x+(29 340-6.23T)(1-x)} J mol(-1)It is necessary to include excess entropy terms to obtain a good fit to the experimental data. The chemical spinodal curve is computed from the thermodynamic parameters

Item Type:	Journal Article
Publication:	Journal of Materials Chemistry
Publisher:	Royal Society of Chemistry
Additional Information:	Copyright of this article belongs to Royal Society of Chemistry.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	26 May 2011 07:02
Last Modified:	26 May 2011 07:02
URI:	http://eprints.iisc.ac.in/id/eprint/37904

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