Physics – Condensed Matter – Materials Science
Scientific paper
1998-10-28
Physics
Condensed Matter
Materials Science
16 pages, 15 figures
Scientific paper
10.1016/S0304-8853(99)00296-6
Using spin density functional theory we have carried out a comparative study of chemical bonding and magnetism in Fe_4N, Fe_3N and Fe_2N. All of these compounds form close packed Fe lattices, while N occupies octahedral interstitial positions. High spin fcc Fe and hypothetical FeN with rock salt structure have been included in our study as reference systems. We find strong, covalent Fe-N bonds as a result of a substantial \sigma-type p-d hybridisation, with some charge transfer to N. Those Fe d orbitals which contribute to the p-d bonds, do no longer participate in the exchange splitting of the Fe d bands. Because of the large exchange fields, the majority spin d bands are always fully occupied, while the minority spin d bands are close to half-filling, thus optimizing the Fe d-d covalent bonding. As a consequence, in good approximation the individual Fe moments decrease in steps of 0.5 \mu_B from fcc iron (2.7 \mu_B) via Fe_4N (2.7 and 1.97 mu_B}), \chem{Fe_3N} (1.99 \mu_B) to \zeta - Fe_2N (1.43 \mu_B).
Hellwig S.
Sifkovits M.
Smolinski H.
Weber Werner
No associations
LandOfFree
Interplay of Chemical Bonding and Magnetism in Fe_4N, Fe_3N, Fe_2N does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Interplay of Chemical Bonding and Magnetism in Fe_4N, Fe_3N, Fe_2N, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interplay of Chemical Bonding and Magnetism in Fe_4N, Fe_3N, Fe_2N will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-542915