Solid-State immiscibility and thermodynamics of the calcium oxide-strontium oxide system

Thomas Jacob, K. ; Waseda, Yoshio (1998) Solid-State immiscibility and thermodynamics of the calcium oxide-strontium oxide system Journal of the American Ceramic Society, 81 (4). pp. 1065-1068. ISSN 0002-7820

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Official URL: http://www3.interscience.wiley.com/journal/1191008...

Related URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02451.x

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 CaxSr1-xO 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 ΔGE = 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:Article
Source:Copyright of this article belongs to American Ceramic Society.
ID Code:13060
Deposited On:11 Nov 2010 06:58
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