Abstract
Elemental powder mixtures of the composition Co 4− x Fe x Sb 12 with x=0.2, 0.5, 1.0, 1.5, 2.0 were mechanically alloyed by means of high energy ball milling and subsequent isothermal annealing. The single phase skutterudite structure was obtained when x≤0.5, while Sb and FeSb 2-type impurities were detected when x>0.5. The lattice parameters of the skutterudite structure increased linearly with Fe concentration, and the maximum solubility of Fe in the unfilled skutterudite structure Co 4− x Fe x Sb 12 was found to be nearly x=0.68.
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