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£¨4£©From XRD spectra reported in Fig. 3, it is evident that with the increase of the heating time the Nb peaks intensity decreases,  disappearing in spectrum 3d,  but the rest of the spectra are very similar. Is it the intensity scale the same for all spectra?  If it is so, it is clear that the process could be more complex (no graphite at all in spectrum 3b, different intensity ratios between the peaks of the same species in different spectra and so on).


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