Electrodeposition of alloys III. Electrodeposition and x-ray structure of cobalt-indium alloys (initial studies)

Cobalt-indium alloys, ranging in composition from 2.0 to 90.6% cobalt, have been electrodeposited from aqueous solutions. The effect of current density on current efficiency and composition of the deposit has been studied. An increase in current density increases the cobalt content of the deposits. Addition of ammonium citrate improves current efficiency. X-ray studies of the annealed deposits indicate the presence of two intermediate phases, CoIn₃ and Co₃In₂, both of which are tetragonal. The lattice constants are: CoIn₃, a = 8.2195 Å, c = 8.669 Å, c/a = 1.020; Co₃In₂, a = 8.23 Å and c = 10.478 Å, c/a = 1.272.