Specific Fe site moment enhancement in Y{sub 2}Fe{sub 17} upon N insertion
- Department of Physics and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269 (United States)
In order to gain information concerning the separate effects of lattice expansion and Fe{endash}N chemical bonding on the Fe moment for each individual Fe site in R{sub 2}Fe{sub 17}N{sub x} systems (R=rare earth), x-ray diffraction, magnetization, and {sup 57}Fe nuclear magnetic resonance experiments were carried out on rhombohedral Y{sub 2}Fe{sub 17}N{sub x} with N content 0{le}x{le}2.8. The increase of the average {sup 57}Fe hyperfine field (HF) from the unnitrided to the nitrided phase follows the increase in the saturation magnetization, providing evidence that the {sup 57}Fe HF does scale with the Fe moment in this system. The changes of the {sup 57}Fe HF are not the same for the various Fe sites; e.g., the HF at the 18f site, which has one N atom as a nearest neighbor, has much less enhancement than that at the 9d site, which has no N atoms as a nearest neighbor. More significantly, for the Fe 6c site, the HF does not change at all with nitrogen content. These results are analyzed in conjunction with existing neutron diffraction data regarding the Fe{endash}Fe distance variations upon nitrogenation and yield a very consistent picture. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 496501
- Report Number(s):
- CONF-961141--
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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