Thermochemistry of binary liquid gold alloys: The systems Au-Ni,Au-Co,Au-Fe,and Au-Mn |
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Authors: | Letitia Topor O J Kleppa |
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Affiliation: | (1) James Franck Institute, University of Chicago, 5640 South Ellis Avenue, 60637 Chicago, IL |
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Abstract: | In this paper we report enthalpy of mixing data for the liquid alloys of gold with manganese, iron, cobalt, and nickel obtained
by a Calvet-type calorimeter at 1378 K. The enthalpies of mixing are compared with Gibbs energies calculated from earlier
emf and vapor pressure studies to yield information on the excess entropies of mixing. The limiting enthalpies of solution
of the liquid transition metals in liquid gold are compared with values predicted from the semi-empirical model of Miedemaet al. and with earlier data for the same transition metals in liquid copper. The calculated values of the excess entropy of solution
in liquid gold are compared with the corresponding values in liquid copper near 1400 K. For Ni, Co, and Fe as solutes we observepositive shifts of 5 to 9 J K−1 mol−1 which are attributed to vibrational entropy terms. For Mn there is a strongnegative shift of about 35 J K−1 mol−1. This shift probably is due to “complex” or “associate” formation between gold and manganese atoms. |
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