Mathews, Tom ; Jena, H. N. ; Subramanian, T. ; Vasudeva Rao, P. R. ; Mathews, C. K. (1995) An electrochemical investigation of the thermodynamic properties of cerium stannide (CeSn3) and liquid tin-cerium alloys Journal of Alloys and Compounds, 228 (1). pp. 1-5. ISSN 0925-8388
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/092583...
Related URL: http://dx.doi.org/10.1016/0925-8388(95)01608-2
Abstract
The thermodynamic properties of the intermetallic compound CeSn3 and the tin-rich liquid tin-cerium alloys in equilibrium with CeSn3 were studied by a high-temperature galvanic cell technique using the reversible concentration cell Ta, Ce||CeCl3, LiCl-KCl (eutectic)Ce||-Sn (two-phase alloy), Ta in the temperature range 723-873 K. The standard Gibbs energy of formation of CeSn3 from pure solid cerium and pure liquid tin varies with temperature according to the equation ΔGf(CeSn3)0 = -260.08 + 0.0476T (±2) kJ mol-1 The activity coefficients, excess partial molar free energies, enthalpies and entropie= of cerium in the saturated liquid alloys have been computed from the e.m.f. data obtained in this study and the data for the solubility of cerium in liquid tin. The activity coefficients of cerium in liquid tin with reference to solid cerium can be expressed as GCexs = RT ln τCe = -249+0.059T (±2) kJ mol-1.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Formation Enthalpy; Galvanic Cell Technique |
| ID Code: | 25418 |
| Deposited On: | 06 Dec 2010 13:25 |
| Last Modified: | 06 Jun 2011 11:11 |
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