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

Jacob, K. T. ; Varghese, Viji (1995) Solid-state miscibility gap and thermodynamics of the system BaO–SrO Journal of Materials Chemistry, 5 (7). pp. 1059-1062. ISSN 0959-9428

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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: ΔGE=x(1–x){33 390–7.09Tx+(29 340–6.237T)(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:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:12924
Deposited On:11 Nov 2010 08:25
Last Modified:03 Jun 2011 09:35

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