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Carbon and nitrogen austenites, modeled by Fe8N and Fe8C superstructures arestudied by full-potential LAPW method. Structure parameters, electronic andmagnetic properties as well as hyperfine interaction parameters are obtained.Calculations prove that Fe-C austenite can be successfully modeled by orderedFe8C superstructure. The results show that chemical Fe-C bond in Fe8C hashigher covalent part than in Fe8N. Detailed analysis of electric field gradientformation for both systems is performed. The calculation of electric fieldgradient allow us to carry out a good interpretation of Moessbauer spectra forFe-C and Fe-N systems.Comment: 8 pages, 3 figures, IOP-style LaTeX, submitted to J. Phys. Condens.  Matte

The influence of carbon and nitrogen on the electronic structure and hyperfine interactions in face-centred-cubic iron-based alloys