Electrode potentials of indium and gallium couples have been measured in dilute solutions of the ionic species in fused LiCI-KC1 eutectic at 450 "C.Standard molar electrode potentials of the observed couples are -1.210, -0.944, and -1.136 V against a standard molar platinum reference for the In(1)-In(O), In(II1)-In(I), and Ga(II1)-Ga(0) couples, respectively. These oxidation states and potentials are compared with previous work in this and other fused salt systems.

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The electrode potentials of the Ge(II)/Ge(0) and Ge(IV)/Ge(II) redox couples in fused LiC1-KC1 eutectic were found to be --0.792 and --0.665V vs. the standard molar platinum reference electrode (SMPE). A voltammetric study of Ge (II) showed that potentials more negative than --0.80V are sufficient for electrodeposition of germanium. Chronopotentiometric reduction of Ge(II) on gold followed the Sand equation and gave evidence of alloy formation. The cell Au-Ge (12 weight per cent Ge, 1)/Ge(II) in LiC1-KC1/Ge(s) was studied, and the following parameters were determined for the alloy: ~S~ ---14.2 eu, AG~ = --1.24 kcal/mole, AH~ _--+9.00 kcal/mole. Optical and scanning electron metallographic studies were made of germanium deposited on a gold substrate.

Electrode potentials of thallium and tin couples were measured in dilute solutions of the ionic species in fused LiCI-KC1 eutectic, at 450 "C. Standard molar electrode potentials of the TI(III)/TI(I) and Sn(IV)/Sn(II) couples are +O. 155 and -0.310 V against a standard molar platinum reference electrode (s.m.p.e.). The standard potentials of the TI(III)/TI(O) and Sn(IV)/Sn(O) couples were calculated to be -0.385 and -0.964 V, respectively, vs. the s.m.p.e.

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