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http://dx.doi.org/10.3740/MRSK.2002.12.4.283

Activity Measurement of Zn in Liquid Zn-Cd Alloy Using EMF Method  

Jeong, Seong-Yeop (Dept. of Advanced Materials Engineering, Kookmin University)
Jeong, U-Gwang (Dept. of Advanced Materials Engineering, Kookmin University)
Park, Jong-Jin (Division of Materials and Chemical Engineering, Hanyang University)
Publication Information
Korean Journal of Materials Research / v.12, no.4, 2002 , pp. 283-289 More about this Journal
Abstract
The E.M.F of the galvanic cell with fused salt was measured to determine the activities of zinc at 700-820K over the entire composition range of liquid Zn-Cd alloys. The cell used was as follows: (-) W ｜ Zn(pure) $Zn^{2+}(KCI-LiCl)$ ｜ Zn(in Zn-Cd alloy) ｜ W (+) The activities of zinc in the alloys showed positive deviation from Raoult's law over the entire composition range. The activity of cadmium and some thermodynamic functions such as Gibbs free energy, enthalpy, entropy were derived from the results by the thermodynamic relationship. The comparison of the results and the literature data was made. The liquid Zn-Cd alloy is found to be close to the regular solution. The concentration fluctuations in long wavelength limit, $S_{cc}(o)$, in the liquid alloy was calculated from the results.
Keywords
activity; zinc-cadmium alloy; electromotive force method; fused salt method; liquid alloy; thermodynamics;
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