Abstract
The Co2NiGa alloy with a fcc structure was synthesized by different methods, arc-melting and mechanical alloying. In contrast with the solid solution state in melted Co2NiGa, an intermetallic structure, highly ordered atomic arrangement has been verified in ball-milled sample by x-ray diffraction examination and Rietveld analysis. This ordered structure increases the saturation magnetization about 40% higher than that of solid solution sample. A highly ordered Co2NiGa intermetallic compound model was established for carrying out first-principles calculation. The obtained electronic structure and the molecular moment are quite consistent with the experimental results. The characterization of the samples prepared in different alloying processes is also reported.
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