Title :
Neutron diffraction and magnetic studies of Nd2Fe17-xTx (T=Si, Mn) alloys
Author :
Yelon, W.B. ; Hu, Z.M. ; Chen, M. ; Luo, H. ; Ezekwenna, C. ; Marasinghe, G.K. ; James, W.J. ; Buschow, K.H.J. ; Middleton, D.P. ; Pourarian, F.
Author_Institution :
Res. Reactor, Missouri Univ., Columbia, MO, USA
fDate :
9/1/1996 12:00:00 AM
Abstract :
We have carried out neutron and magnetic studies on Nd2Fe17-xTx (T=Si, Mn) alloys. The unit cell of the compounds contracts with both Si and Mn substitution. Si atoms avoid the 6c site, prefer the 18h site strongly, fill the 9d site steadily and fill the 18f site only at relatively high Si concentration. Mn atoms avoid the 9d sites but prefer the 6c site strongly, while the 18f site and 18h site fill slowly. The Si site occupancies appear to be dominated by the crystal environment while the Mn site occupancies are dominated by steric considerations. The Curie temperature of the compound Nd2Fe17 increases significantly with Si substitution but is only affected slightly by the Mn substitution. Although the unit cell contracts with increasing Si concentration, the average length of bonds to the Fe(6c) and the Fe(18f) sites increase slightly at x<4
Keywords :
Curie temperature; bond lengths; ferromagnetic materials; iron alloys; manganese alloys; neodymium alloys; neutron diffraction; permanent magnets; silicon alloys; Curie temperature; Nd2Fe17-xMnx; Nd2Fe17-xSix; Nd2Fe17Mn; Nd2Fe17Si; bond length; neutron diffraction; site occupancies; substitution; Annealing; Contracts; Inductors; Iron alloys; Manganese alloys; Neodymium; Neutrons; Silicon; Temperature; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
