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Original scientific paper

https://doi.org/10.5562/cca2782

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

Alex Scrimshire ; Materials and Engineering Research Institute, Sheffield Hallam University, City Campus, Howard Street, Sheffield, S1 1WB, UK
Alex L. Lobera ; Ecole des Mines de Nantes, 4 Rue Alfred Kastler, BP 20722, 44307 Nantes Cedex 3, France
Roman Kultyshev ; Johnson Matthey Technology Centre, Sonning Common, Reading, West Berkshire, RG4 9NH, UK
Peter Ellis ; Johnson Matthey Technology Centre, Sonning Common, Reading, West Berkshire, RG4 9NH, UK
Susan D. Forder ; Materials and Engineering Research Institute, Sheffield Hallam University, City Campus, Howard Street, Sheffield, S1 1WB, UK
Paul A. Bingham ; Materials and Engineering Research Institute, Sheffield Hallam University, City Campus, Howard Street, Sheffield, S1 1WB, UK


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Abstract

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.

Keywords

Mössbauer, iron carbides, Debye, Hägg, cementite, catalyst

Hrčak ID:

153187

URI

https://hrcak.srce.hr/153187

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