NEUTRON-DIFFRACTION AND MOSSBAUER-EFFECT STUDY OF THE STRUCTURE OF DYSIXFE11-XCON ALLOYS

DySixFe11-xCo (x=0.5, 1.0, and 1.5) alloys and their nitrides are stud ied by x-ray diffraction, Mossbauer effect and neutron diffraction exp eriments. The results show that both Si and Co atoms can occupy the 8f and 8j sites, and more preferentially occupy the 8f sites. Nitrogen a toms as interstitial atoms enter into the 2b site. The nitrides have h igh Curie temperatures. The results of Mossbauer spectroscopy indicate that nitriding increases the hyperfine fields of all Fe sites.