Iron impurities on interstitial (Fei) and substitutional sites (FeS) in SiC were detected by 57Fe emission Mössbauer spectroscopy following implantation of radioactive 57Mn+ parent ions. At below 900K, two Fei species were found, attributed to quasi-tetrahedral interstitial sites surrounded by four C (Fei,C) or Si atoms (Fei,Si), respectively. Above 900K, the Fei,Si site was suggested to transform into the Fei,C site by a single Fei jump during the lifetime of the Mössbauer state (T½ = 100ns). Fei,C and substitutional FeS sites were stable up to >1070K.

Identification of Substitutional and Interstitial Fe in 6H-SiC. H.P.Gunnlaugsson, K.Bharuth-Ram, M.Dietrich, M.Fanciulli, H.O.U.Fynbo, G.Weyer: Hyperfine Interactions, 2006, 169[1-3], 1319-23