Neutron diffraction study of the structural and magnetic properties of ε -Fe 3 N 1.098 and ε -Fe 2.322 Co 0.678 N 0.888

Lei, Li and Zhang, Leilei and Gao, Shangpan and Hu, Qiwei and Fang, Leiming and Chen, Xiping and Xia, Yuanhua and Wang, Xianlong and Ohfuji, Hiroaki and Kojima, Yohei and Redfern, Simon A. T. and Zeng, Zhi and Chen, Bo and He, Duanwei and Irifune, Tetsuo (2018) Neutron diffraction study of the structural and magnetic properties of ε -Fe 3 N 1.098 and ε -Fe 2.322 Co 0.678 N 0.888. Journal of Alloys and Compounds, 752. pp. 99-105. ISSN 09258388 DOI https://doi.org/10.1016/j.jallcom.2018.04.143

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Official URL: http://doi.org/10.1016/j.jallcom.2018.04.143

Abstract

Binary ε-Fe3N1.098 and ternary ε-Fe2.322Co0.678N0.888 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-Fe3N1.098 structure, space group P6322, 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-Fe2.322Co0.678N0.888 did not reduce the mean magnetic moment (μm) per metal atom at the Wyckoff 6 g site. NPD refinements showed that the magnetic moment per Fe atom in ε-Fe3N1.098 (at 1.8 (4) μB) was slightly higher than that of ε-Fe2.322Co0.678N0.888, where the moment per Fe/Co atom is 1.7(2) μB.

Item Type: Article
Uncontrolled Keywords: 2018AREP; IA74
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Alloys and Compounds
Volume: 752
Page Range: pp. 99-105
Identification Number: https://doi.org/10.1016/j.jallcom.2018.04.143
Depositing User: Sarah Humbert
Date Deposited: 04 May 2018 10:11
Last Modified: 04 May 2018 10:11
URI: http://eprints.esc.cam.ac.uk/id/eprint/4260

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