| The activity in the thermodynamic properties of the molten alloy systems make an offer very important information for metal refining. Activities of components in Ga-Sb molten alloy system were determined by the use of atomic absorption specetrometer (AAS) which was modified for our purpose. The heat of vaporization of an element was determined as the slope of the log(A˚T) vs 1/T plot, where A˚ is the absorbance of the vapor, and T is the temperature of the sample. Thus values obtained for Ga and Sb were close to, but some lower than those in the literature. The activities of Ga and Sb in molten Ga-Sb alloys at 1100K showed negative deviations from Raoult`s law over the whole composition range. The activity coeffients of composition elements at infinte dilution solution is γ˚ = 0.22, γ˚ = 0.18 at 1100K In addition other, thermodynamic functions was calculated on the basis of the result obtained. As a rusult of this study, atomic absorption spectrometry(AAS) was effective as activity mesurement method about alloy systems that involves not only monomeric species but also polymetric species in equilibrium vapor phase. |
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