Title :
Magnetic and structural properties of Fe3GeNx
Author :
Xu, Y. ; Elbicki, J.M. ; Wallace, W.E. ; Simizu, S. ; Sankar, S.G.
Author_Institution :
Carnegie Mellon Univ., Pittsburgh, PA, USA
fDate :
9/1/1992 12:00:00 AM
Abstract :
Magnetic and structural properties of Fe3GeNx have been investigated. The FCC (face centered cubic) phase of FeGe absorbs nitrogen to x=0.24. As a result of absorption, the Curie temperature and room temperature magnetization decrease from 736 K and 137 emu/g to 614 K and 74 emu/g, respectively. The HCP (hexagonal close packed) phase of Fe3Ge, however, transforms to either FCC tetragonal phase, or a combination of these upon nitrogenation. The tetragonal nitride phase forms at a reaction temperature of 600°C to 650°C in a flowing atmosphere of ammonia. The phase is paramagnetic at room temperature and appears to order antiferromagnetically below 100 K
Keywords :
Curie temperature; X-ray diffraction examination of materials; antiferromagnetic properties of substances; crystal atomic structure of alloys; ferromagnetic properties of substances; germanium alloys; iron alloys; magnetisation; nitridation; paramagnetic properties of substances; paramagnetic-antiferromagnetic transitions; Curie temperature; FCC phase, HCP phase; Fe3GeNx; X-ray diffraction; absorption; antiferromagnetic; crystal structure; face centred cubic phase; hexagonal close packed phase; magnetic properties; nitrogenation; paramagnetic; reaction temperature; room temperature magnetization; structural properties; tetragonal nitride phase; Absorption; Antiferromagnetic materials; Atmosphere; FCC; Iron; Magnetic properties; Magnetization; Nitrogen; Paramagnetic materials; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
