Abstract
The e.m.f. method using the zirconia solid electrolyte has been applied to the study of determination of the various thermodynamic values at the temperatures above 900 K.
This work was done for the purpose of applying this method to obtain the fundamental data on practical lead refining at temperatures of 623∼773 K.
In this work, it was recognized that the stabilized zirconia was useful as an electrolyte even at the lower temperature of about 673 K and the Y2O3 stabilized zirconia was found to be better than the CaO stabilized zirconia as the solid oxide electrolyte to be used at the temperature of 673∼773 K.
For the measurement of the e.m.f. at the lower temperatures as this work, however, it must be considered to minimize the internal resistance of the cell.
E.m.f.’s of galvanic cells with the solid oxide electrolyte (ZrO2+CaO) and (ZrO2+Y2O3) were measured to determine the standard free energies of formation of PbO, FexO, Fe3O4, Cu2O and Sb2O3 in the following temperature ranges.
The cell used were as follows:
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oindentThe results were represented by the following equations:
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