Abstrakt

Melt spun Ni70Ga30, Ni70Sn30 and Ni70In30 show different oxidation behaviour following heat treatment at 900°C in air. The Ni70Ga30 ribbon develops a continuous layer of Ga2O3 oxide, which passivates the surface and prevents further oxidation of the Ni3Ga bulk phase. On the contrary, the Ni70Sn30 and Ni70In30 ribbons undergo considerable segregation and decomposition and aside from the Ni and NiO and the primary Ni3Sn and Ni3In also comprise SnO2 and In2O3 phases. Results are conformed from XRD, TEM and XPS analysis. The oxidation behaviour especially in the case of the Ni70Sn30 ribbon is promising with view for development of fine Ni particles on the Ni3Sn support.