ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Intermetallics compounds Dy2Fe17Cx (x=1.5,2.0,2.5,2.8) and Tb2Fe17Cx (x=1.5,2.0,2.5) have been successfully prepared by the melt-spinning method. The x-ray-diffraction patterns and the thermomagnetic curves show that they are single phase with the rhombohedral Th2Zn17-type structure, except for Dy2Fe17C2.8 and Tb2Fe17C2.5 which have a small percentage of α-Fe. 57Fe Mössbauer spectra were measured at 12 K and room temperature to study both the magnetic properties of R2Fe17Cx on a local scale and the effect of the interstitial C atom on the Fe atoms. It is found that the effective hyperfine fields of the various Fe sites decrease in the order 6c(approximately-greater-than)18 f(approximately-greater-than)18h(approximately-greater-than)9d. The average effective hyperfine fields Heff at 12 and 293 K do not change much with C concentration x in agreement with the moment of the Fe atoms obtained by magnetic measurements at 1.5 K. It can be concluded that the effect of C is to enhance the exchange interaction between Fe-Fe atoms, which is sensitive to the distance of Fe-Fe atoms. The C has little influence on the moments of Fe atoms.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.358175
