Abstract
The E.M.F. of the following galvanic cells involving zirconia solid electrolytes have been measured in order to obtain the standard free energy of formation of ZnO in the temperature range 818 to 986 K and the thermodynamic data of the liquid Au-Zn and Ag-Zn systems, for NZn=0.25∼0.80 and NZn=0.27∼0.85, in the temperature ranges 918 to 1123 K and 865 to 1152 K, respectively.
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oindentThe error arising from vaporization of zinc was carefully avoided in this study.
The standard free energy of formation of ZnO was determined:
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The activity curves obtained show considerably negative deviations from Raoult’s law, especially in the Au-Zn system, suggesting the large affinity of zinc for gold and silver.
The properties of alloys between metals of I B (Au, Ag, Cu, noble metals) and zinc have been discussed in terms of recent progress of the alloy theories by Engel.
It is proved phenomenologically that the break points of αZn function at approximately NZn=0.40 in liquid Au-Zn, Ag-Zn and Cu-Zn systems may be also interesting from the standpoint of recent stability theories of alloy phases.
