Neutron Diffraction and Magnetic Studies of Nd₂Fe_17-xT_x (T=Si, Mn) Alloys

William B. Yelon, Missouri University of Science and Technology
Z. Hu
Mingxing Chen
H. Luo
F. Pourarian
Peter C. Ezekwenna
G. K. Marasinghe
K. H. J. Buschow
D. P. Middleton
William Joseph James, Missouri University of Science and Technology

This document has been relocated to http://scholarsmine.mst.edu/phys_facwork/371

There were 10 downloads as of 28 Jun 2016.

Abstract

We have carried out neutron and magnetic studies on Nd₂Fe_17-xT_x (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 Nd₂Fe_17-xT_x 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.