抄録
The present study shows an extended application of the TIE method to the determination of activities in molten alloys.
At the moment the electrolyte touched with both electrodes, the concentration cell employed may be represented as follows:
Ag(s) | AgCl(l in PbCl2+KCl) | Ag–Bi(l).
In the present study, two major problems are encountered: Pure solid silver must be employed in a standard electrode and the possible displacement reaction between the electrolyte and the molten alloy must be overcome in a way similar to the lead-tin system.
The measurements of the surface and the body activities revealed the following results.
(1) No evidence of displacement reaction was observed between the electrolyte and the alloy under the experimental conditions.
(2) A significant difference was observed between the surface and the body activities in which some of the surface activity curves behaved as suggesting the existence of the two phase liquid in the concentration range NAg=0.45 to 0.55.
(3) The surface activities measured at 500°C were in good agreement with the value estimated from the phase diagram.
