Abstract
Above 6 to 8N, , the initial dissolution rate of germanium decreased with increasing concentration and increasing stirring rate. The time required to bring about passivation of the germanium in these solutions decreased from several hours to a few seconds in going to higher concentrations. A surface oxide film (very likely ) is associated with the passivity of germanium. Accordingly, the presence of HF which dissolves but not germanium prevented germanium passivity. Dissolution potential measurements were consistent with the kinetic data.
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