1971 Volume 44 Issue 10 Pages 2706-2709
Using the following solid oxide-electrolyte galvanic cells, Pt/air//ZrO2 (+CaO) O//(in Cu–Ni alloy)/Mo and Pt/air//ZrO2 (+CaO) O//(in Cu–Ag alloy)/Mo, the electromotive forces of the cells have been measured as a function of the oxygen concentration in copper-nickel or -silver alloys at oxygen concentrations ranging from several ppm to 1000 ppm, at 1210°C for copper-nickel alloys and at 1100°C or 1200°C for copper-silver alloys respectively. The activity coefficient of oxygen has been determined from the electromotive force for the alloy systems investigated. In the case of copper-nickel, the activity coefficient of oxygen decreases with an increase in the nickel concentration and also with a decrease in the oxygen concentration. The solubility of oxygen in the copper-nickel alloy has also been measured at 1210°C by the use of the following galvanic cell, Pt/air//ZrO2(+CaO)//O(in Cu–Ni alloy), NiO/Mo.
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