Thermodynamic properties of calcium-magnesium alloys determined by emf measurements

被引：43

作者：

Newhouse, Jocelyn M. ^{[1
]}

Poizeau, Sophie ^{[1
]}

Kim, Hojong ^{[1
]}

Spatocco, Brian L. ^{[1
]}

Sadoway, Donald R. ^{[1
]}

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

ELECTROCHIMICA ACTA | 2013年 / 91卷

关键词：

Calcium-magnesium alloys; Emf method; Thermodynamic properties; High temperature electrochemistry; Liquid metal battery; LIQUID ALLOYS; ASSOCIATION MODEL; SYSTEM; CA; TEMPERATURES; EQUILIBRIUM; HALIDES; METALS; ENERGY;

D O I：

10.1016/j.electacta.2012.11.063

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The thermodynamic properties of calcium-magnesium alloys were determined by electromotive force (emf) measurements using a Ca(in Bi)vertical bar CaF2 vertical bar Ca(in Mg) cell over the temperature range 713-1048 K. The activity and partial molar Gibbs free energy of calcium in magnesium were calculated for nine Ca-Mg alloys, calcium mole fractions varying from x(ca) = 0.01 to 0.80. Thermodynamic properties of magnesium in calcium and the molar Gibbs free energy of mixing were estimated using the Gibbs-Duhem relationship. In the all-liquid region at 1010 K, the activity of calcium in magnesium was found to range between 8.8 x 10(-4) and 0.94 versus pure calcium. The molecular interaction volume model (MIVM) was used to model the activity coefficient of Ca and Mg in Ca-Mg liquid alloys. Based on this work, Ca-Mg alloys show promise as the negative electrode of a liquid metal battery in which calcium is the itinerant species: alloying with Mg results in both a decrease in operating temperature and suppression of Ca metal solubility in the molten salt electrolyte. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：293 / 301

页数：9

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