Metastable RFe7 compounds (R=rare earths) and their nitrides with TbCu7 structure : The 40th annual conference on magnetism and magnetic materials

Mao, O. ; Yang, J. ; Altounian, Z. ; Ström-Olsen, J. O.

[S.l.] : American Institute of Physics (AIP)
Published 1996
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
RFe7 compounds with the TbCu7 structure have been synthesized by annealing of mechanically alloyed powders. The lattice constants a and c decrease with increasing atomic number of the rare earths except for Ce which has a different valence state. Introduction of nitrogen interstitial atoms into the structure results in a ∼6.0% volume expansion. In addition, nitriding gives rise to a dramatic enhancement of the magnetic properties of the compounds. Curie temperatures are increased by ∼300 °C upon nitriding. RFe7 nitrides with R=Sm, Tb, Dy, and Ho have high coercivities. A substantial enhancement in the magnetic remanence for the RFe7 nitrides with R=Tb, Dy, and Ho is attributed to the magnetic exchange coupling between grains of nanocrystalline structure in the powders. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL: