Abstract
Effect of Mo addition on phase stability of β-Nb 5Si 3 in NbSi 2/Nb 5Si 3 in situ composites has been investigated using X-ray diffraction (XRD). The preferential occupancy of the Mo atoms in the β-Nb 5Si 3 structure was investigated with the Rietveld profile technique. It is suggested that Mo addition stabilizes the β-Nb 5Si 3 phase. The results were explained on the basis of selective substitution of Mo atoms in β-Nb 5Si 3.
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