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Electrochemical behavior of Mn5Si3, Mn5Ge3, Mn, Si, and Ge in sulfuric acid solutions is studied by steady-state and cyclic voltammetry. The cathodic process on Mn5Ge3 is defined by the metallic component. During anodic polarization of Mn5Si3, manganese selectively dissolves out of the silicide lattice and silicon that remains on its surface oxidizes to SiO2, with the Si anodic dissolution rate plummeting...
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