Neutron diffraction study of the structural and magnetic properties of ε-Fe<inf>3</inf>N<inf>1.098</inf>and ε-Fe<inf>2.322</inf>Co<inf>0.678</inf>N<inf>0.888</inf>
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Authors
Lei, L
Zhang, L
Gao, S
Hu, Q
Fang, L
Chen, X
Xia, Y
Wang, X
Ohfuji, H
Kojima, Y
Zeng, Z
Chen, B
He, D
Irifune, T
Publication Date
2018-07-05Journal Title
Journal of Alloys and Compounds
ISSN
0925-8388
Publisher
Elsevier
Volume
752
Pages
99-105
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Lei, L., Zhang, L., Gao, S., Hu, Q., Fang, L., Chen, X., Xia, Y., et al. (2018). Neutron diffraction study of the structural and magnetic properties of ε-Fe<inf>3</inf>N<inf>1.098</inf>and ε-Fe<inf>2.322</inf>Co<inf>0.678</inf>N<inf>0.888</inf>. Journal of Alloys and Compounds, 752 99-105. https://doi.org/10.1016/j.jallcom.2018.04.143
Abstract
Binary ε-Fe 3 N 1.098 and ternary ε-Fe 2.322 Co 0.678 N 0.888 were synthesized as spherical bulk materials using novel high-pressure solid-state metathesis reactions (HPSSM). The structural and magnetic properties of the two nitrides were investigated using neutron powder diffraction (NPD), a vibrating sample magnetometer (VSM), and first-principle calculations. We found that at high pressure and high temperature (HPHT), nitrogen atoms enter the interstitial 2d sites of the nitrogen-rich ε-Fe 3 N 1.098 structure, space group P6 3 22, which were previously reported to be vacant. The stoichiometry of the nitride (N/Me ratio) and the level of disorder have a significant influence on the site occupancies and local magnetic moments in these iron-based nitrides. The substitution of Fe by Co in ε-Fe 2.322 Co 0.678 N 0.888 did not reduce the mean magnetic moment (μ m ) per metal atom at the Wyckoff 6 g site. NPD refinements showed that the magnetic moment per Fe atom in ε-Fe 3 N 1.098 (at 1.8 (4) μ B ) was slightly higher than that of ε-Fe 2.322 Co 0.678 N 0.888 , where the moment per Fe/Co atom is 1.7(2) μ B .
Sponsorship
Natural Environment Research Councilunder grant NE/P012167/1
Funder references
Natural Environment Research Council (NE/P012167/1)
Identifiers
External DOI: https://doi.org/10.1016/j.jallcom.2018.04.143
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286015
Rights
Licence:
http://creativecommons.org/licenses/by-nc-nd/4.0/
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