A Neutron Diffraction and Mössbauer Effect Study of the Nd₂Fe₁₇₋ₓSiₓ Solid Solutions
The substitution of silicon for iron in Nd2Fe17 strongly raises the Curie temperature but leads to a reduction in the unit cell volume. Refinement of the neutron-diffraction pattern for Nd2Fe12.91Si4.09 indicates that silicon preferentially occupies the 18h site in the Nd2Fe17 structure, the site with the most neodymium near neighbors. This occupation is surprising because conventional arguments would suggest that replacement of iron on the 6c site, which has a very short iron to near-neighbor iron bond length, would yield an increase in the Curie temperature. © 1993.
G. J. Long and G. K. Marasinghe and S. Mishra and O. A. Pringle and F. Grandjean and K. H. Buschow and D. P. Middleton and W. B. Yelon and F. Pourarian and O. Isnard, "A Neutron Diffraction and Mössbauer Effect Study of the Nd₂Fe₁₇₋ₓSiₓ Solid Solutions," Solid State Communications, Elsevier, Jan 1993.
The definitive version is available at http://dx.doi.org/10.1063/1.367708
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© 1993 Elsevier, All rights reserved.