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-xTx 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.
W. B. Yelon and Z. Hu and M. Chen and H. Luo and F. Pourarian and P. C. Ezekwenna and G. K. Marasinghe and K. H. Buschow and D. P. Middleton and W. J. James, "Neutron Diffraction and Magnetic Studies of Nd2Fe17-xTx (T=Si, Mn) Alloys," IEEE Transactions on Magnetics, vol. 32, no. 5, pp. 4431-4433, Institute of Electrical and Electronics Engineers (IEEE), Jan 1996.
The definitive version is available at http://dx.doi.org/10.1109/20.538891
2001 IEEE Industry Applications Conference, 2001. Thirty-Sixth IAS Annual Meeting
Keywords and Phrases
Curie Temperature; Nd2Fe17-XMnx; Nd2Fe17-XSix; Nd2Fe17Mn; Nd2Fe17Si; Bond Length; Bond Lengths; Ferromagnetic Materials; Iron Alloys; Manganese Alloys; Neodymium Alloys; Neutron Diffraction; Permanent Magnets; Silicon Alloys; Site Occupancies; Substitution
International Standard Serial Number (ISSN)
Article - Journal
© 1996 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.