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.

Publication Title

Solid State Communications