We report the observation of an alloy phase with fluorite-type structure containing Ni, Fe, Cu, and Si, found as precipitates in multicrystalline silicon. The analysis of extended x-ray absorption fine-structure microspectroscopy (μ-EXAFS) measurements on the K edges of the transition metals of the precipitates and a synthetic reference material with composition of Ni0.82Fe0.21Cu0.02Si1.94 support a structure model similar to NiSi₂ but with mixed occupancies of Fe on the Ni site and Cu on the Si site. This observation provides evidence that transition metals interact during precipitation within silicon and form complex silicides.
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Heuer et al. (2006) studied this question.
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