Open AccessMagnetic, Electronic, and Mechanical Properties of Bulk ε-Fe2N Synthesized at High Pressures
Author(s) -
Teng Ma,
Yanfeng Yin,
Fang Hong,
Pinwen Zhu,
Xiaohui Yu
Publication year - 2021
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.1c00551
Subject(s) - coercivity , ferromagnetism , electrical resistivity and conductivity , curie temperature , rietveld refinement , materials science , trigonal crystal system , vickers hardness test , condensed matter physics , saturation (graph theory) , magnetization , analytical chemistry (journal) , crystallography , magnetic field , metallurgy , mathematics , chemistry , physics , crystal structure , microstructure , chromatography , quantum mechanics , combinatorics
We sintered bulk trigonal ε-Fe 2 N (space group: P 312) with the high-pressure and high-temperature method. Structural refinements by the Rietveld method result in a trigonal unit cell with parameters of a = 4.7767(1) Å and c = 4.4179(3) Å. ε-Fe 2 N is ferromagnetic with a Curie temperature of ∼250 K, a saturation magnetization ( M s ) value of up to 1.2 μ B /formula units (f.u.), and comparatively low coercive field. The Vickers hardness was measured, and the results showed that the asymptotic hardness of bulk ε-Fe 2 N is about 6.5 GPa with a load of 1000 g. Thermogravimetric (TG) analysis shows that ε-Fe 2 N is thermally stable below 670 K. ε-Fe 2 N exhibits good metal conductivity, and the electron transport measurements show that the resistivity of it is 172 μΩ cm at room temperature. The theoretical calculations suggest that the conducting states are mainly derive from Fe-3d states.