**5.3 Influence of a third component on the exchange reaction**

Exchange reactions occur not only between a pure A metal and alloy AxB(1-x) but also between alloys of different compositions, if the activities *aA* of them are very different. This phenomenon is very pronounced in the liquid ternary system In-Sn-Sb (Vassiliev, 1998). Table 4 shows that the attraction between atoms In and Sb is greater than between In and Sn or between Sn and Sb. Accordingly, the tin atoms of the ternary alloy are very free, and exchange reactions between electrodes of different compositions of alloys, with indium, occur easily.
