A Moessbauer study of Sm{sub 2}Fe{sub 14}Ga{sub 3}C{sub x} (x = 0--2.5)
- Univ. of New South Wales, Sydney, New South Wales (Australia). School of Physics
- Chinese Academy of Sciences, Beijing (China)
{sup 57}Fe Moessbauer spectra of Sm{sub 2}Fe{sub 14}Ga{sub 3}C{sub x} (x = 0, 0.5, 1.0, 1.5, 2.0, 2.5) collected at 293 K have been analyzed using a simplified fitting model of four (for x = 0) or six (for x {ne} 0) broadened sextets which ignores the local Ga environment of each Fe site. The analyses show that the strong Ga preferential occupation of 18h site model results in the best fit to the experimental spectrum. The values of the hyperfine field of four sextets with zero neighboring carbon are virtually constant for all x, namely, 28.7(5), 22.9(5), 20.8(5) and 20.3(5) T. The reduction in hyperfine field with one neighboring carbon for 18f site is 6.3 {+-} 0.8 T; whereas for 18h site it is only 2.7 {+-} 0.1 T. The average hyperfine field decreases slightly with the carbon content, which suggests that the average Fe magnetic moment is largely unaffected by the introduction of carbon. Using a conversion factor of 15 T{mu}{sub B}, the average Fe atomic magnetic moment in Sm{sub 2}Fe{sub 14}Ga{sub 3} is about 1.47 {mu}{sub B} at 293 K. The volume expansion resulting from the introduction of carbon leads to a slight increase in the weighted average of the {sup 57}Fe isomer shift.
- OSTI ID:
- 186956
- Report Number(s):
- CONF-950404-; ISSN 0018-9464; TRN: 96:007197
- Journal Information:
- IEEE Transactions on Magnetics, Vol. 31, Issue 6Pt2; Conference: Conference on magnetism and magnetic materials, San Antonio, TX (United States), 18-21 Apr 1995; Other Information: PBD: Nov 1995
- Country of Publication:
- United States
- Language:
- English
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