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Solid-State Immiscibility and Thermodynamics of the Calcium Oxide-Strontium Oxide System

Jacob, Thomas K and Waseda, Yoshio (1998) Solid-State Immiscibility and Thermodynamics of the Calcium Oxide-Strontium Oxide System. In: Journal of the American Ceramic Society, 81 (4). pp. 1065-1068.

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Abstract

Solid-state miscibility gap in the pseudo-binary calcium oxide-strontium oxide (CaO-SrO) system is delineated by X-ray diffractometry studies on samples equilibrated either under vacuum or in a flowing inert-gas atmosphere at temperatures of 973-1273 K. For the $Ca_xSr_{1-x}O$ solid solution, an asymmetric phase boundary that is characterized by a critical temperature of 1173 (±3) K and a composition of x = 0.53 (±0.01) is obtained. The excess Gibbs energy of mixing of the solid solution, which is derived from the experimental phase-boundary compositions and temperatures, can be represented by the expression ${\Delta}G^E = x$ (1−x)[(27040 − 5.82 T) x + (24915 − 5.34 T)(1 −x)] (in units of J/mol). 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. The results obtained in this study are compared with phase-diagram and calorimetric information that is available in the literature.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Blackwell.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 12 Feb 2007
Last Modified: 27 Aug 2008 12:31
URI: http://eprints.iisc.ernet.in/id/eprint/9335

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