Variable Temperature 57 Fe-Mössbauer Spectroscopy Study of Nanoparticle Iron Carbides

Near-phase-pure nanoparticle iron carbides (Fe3C and Fe5C2) were synthesised. Debye model calculations were used with hyperfine parameters gathered by Fe-57 Mossbauer spectroscopy within a temperature range of 10 K to 293 K, with analysis providing Debye temperatures of 422 K and 364 K for two Fe sites in Fe5C2 and 355 K for ferromagnetic Fe3C. The intrinsic isomer shifts were calculated as 0.45 mm s(-1) and 0.43 mm s(-1) for iron sites 1 and 2 respectively in Fe5C2 and 0.42 mm s(-1) for Fe3C. Recoil-free fractions for the two iron sites were also calculated at f(300) 0.785 and 0.726 for site 1 and 2 respectively.