Abstract
The present study was carried out in an attempt to measure the activities of manganese in the Mn-base molten alloys at a high temperature of 1300°C by using the TIE method.
At the moment the electrolyte comes in contact with both electrodes, the concentration cell for the Mn–Sb molten alloy may be represented as follows:
Mn(l)|MnF2+CaF2+MgF2(l)|Mn−Sb(l).
The measurements for the Mn–Sb, Mn–Ni, Mn–Cu and Mn–Sn alloy systems revealed the following results:
(1) The activities for the Mn-base alloys tend to form horizontal portions in the two concentration ranges.
(2) The measured activities of the Mn–Cu and Mn–Sn systems have revealed remarkable discrepancies by the e.m.f. and vapor pressure methods.
(3) It is concluded that the activity measurements at 1300°C using the TIE method can be performed with a reasonable degree of accuracy.
