Vapour composition and activities in Mg-Zn liquid alloy at 923 K

Jacob, KT and Srikanth, S and Waseda, Y (1988) Vapour composition and activities in Mg-Zn liquid alloy at 923 K. In: Thermochimica Acta, 130 . pp. 193-203.

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Abstract

Vapour species effusing from a magnesia Knudsen cell containing Mg-Zn alloy at 923 K were condensed on a water cooled copper plate. The equilibrium composition of the vapour phase over the alloy was determined from chemical analysis of the condensate. The activity coefficients of both components in the alloy have been derived from the data using a modified Gibbs-Duhem relation. The ratio of saturation vapour pressures of pure Zn and Mg obtained from the analysis of alloy data agree well with values from the literature, providing an internal check on the accuracy of data obtained in this study. Both components of the alloy exhibit negative deviations from Raoult's law. The concentration-concentration structure factor of Bhatia and Thomton at zero wave vector, evaluated from the measurements, indicate the presence of MgZn2 type complex in the liquid state. The associated regular solution model has been used for the thermodynamic description of liquid Mg-Zn alloys.

Item Type:	Journal Article
Publication:	Thermochimica Acta
Publisher:	Elsevier
Additional Information:	Copy rights of this article belongs to Elsevier Science Ltd.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	04 Feb 2010 06:36
Last Modified:	19 Sep 2010 05:39
URI:	http://eprints.iisc.ac.in/id/eprint/21934

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