Mossbauer Studies On Effects Of Be For Magnetic Properties Of Rare-Earth Intermetallic Compounds R2fe17be

The lattice parameters, magnetization and Curie temperature of R2Fe17 decrease with addition of small metal Be, while they increase with the addition of H and N. Mossbauer studies have been performed and the hyperfine fields at four Fe sites 12j(18f), 12k(18h), 6g(9d), 4f(6c) in R2T17 structure were estimated. The hyperfine fields of R2Fe17Be are smaller than those of R2Fe17. The effect of Be on the hyperfine field at the 12k(18h) site is the largest, then at the 12j(18f) site, then the 6g(9d) site. This fact suggests that the Be atoms place at the 2a(3a) site, because these correspond to distances from 2a site to four Fe sites. (C) 1998 Elsevier Science B.V. All rights reserved.