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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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 |
|---|---|
| Publication: | Journal of the American Ceramic Society |
| Publisher: | Blackwell |
| 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.ac.in/id/eprint/9335 |
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