The volume fractions of 00 phase Fe 16 N 2 in bulk samples were estimated using X-ray diffraction data. The SPring-8 synchrotron radiation facility was utilized for data collection. Samples were prepared in an NH 3 +H 2 atmosphere, and a magnetic field was applied to reduce the amount of remanent phase. Samples were then annealed for varying times (0.25-512 h). Rietveld analysis was applied to obtain the volume fractions of each phase generated in the samples. The results showed relatively small fractions of the 00 phase were present. The discrepancy between the present analyses and the results of Mössbauer measurements are also discussed.
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