Abstract
The activity coefficient of oxygen [Formula: see text] in liquid Ag and binary Ag-Te dilute alloys were determined between 1,285 and 1,485 K by coulometric titration using the electrochemical cell (Ir, [O] in liquid metal or alloy | yttria stabilized zirconia | air, Pt). The experimental and evaluation procedures described in the literature were adopted. The oxygen activity coefficient was determined in pure liquid silver to be [Formula: see text]. Next, the oxygen activity coefficient in dilute Ag-(Te)-O alloys for variable XTe content (from 0.01 to 0.06) was measured. From the obtained results, Wagner's interaction parameter [Formula: see text] as a function of temperature was derived in the form [Formula: see text]. The electrochemical coulometric titration method seems to be very useful to study the thermodynamics of oxygen interaction in liquid silver and its alloys.