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Croatica Chemica Acta, Vol.88 No.4 December 2015. -

Near-phase-pure nanoparticle iron carbides Fe3C and Fe5C2 were synthesised. Debye model calculations were used with hyperfine parameters gathered by 57Fe Mössbauer 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 f300 0.785 and 0.726 for site 1 and 2 respectively.

Mössbauer; iron carbides; Debye; Hägg; cementite; catalyst



Autor: Alex Scrimshire - ; Materials and Engineering Research Institute, Sheffield Hallam University, City Campus, Howard Street, Sheffi

Fuente: http://hrcak.srce.hr/



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