Mössbauer and crystallographic study of DyFe3−x Nix compounds

Abstract

Mössbauer and crystallographic investigations were carried out on DyFe3−x Nix compounds crystallizing in the PuNi3 type of structure. The hyperfine field observed at the iron sites shows a maximum at x =0.75. The 12-line spectrum observed at room temperature corresponding to the two different kinds of iron in the structure collapsed into a single six-line pattern at 4.2 K. Lattice parameter c shows a rapid decrease when x is increased beyond 2.0, but no such behavior was found in the a lattice parameter. The results of the x-ray and Mössbauer data are explained in terms of site preference and nonlocalized transition-metal moments, respectively.

Influence of Fe substitution on the structure and magnetic properties in Gd(Ni1−xFex)3 intermetallic compounds

“…Similar behaviour was already observed for Fe-Co and Fe-Ni binary alloys [22], R(Fe 1−x Co x ) 2 Laves phases [23] and other intermetallic compounds such as Th(Fe 1−x Co x ) 5 [24], Dy(Fe 1−x Ni x ) 3 [8]. Some explanation of this behaviour was done by Van Diephen and co-workers [8,24]. They tried to connect the change of the c lattice parameter with substitution of cobalt or iron atoms in preferred position in transition metal sublattice.…”

“…Above this concentration the increase in the c value is not so strong and shows a deviation from the Vegard's law. Similar behaviour was already observed for Fe-Co and Fe-Ni binary alloys [22], R(Fe 1−x Co x ) 2 Laves phases [23] and other intermetallic compounds such as Th(Fe 1−x Co x ) 5 [24], Dy(Fe 1−x Ni x ) 3 [8]. Some explanation of this behaviour was done by Van Diephen and co-workers [8,24].…”

“…One of the most known series is RNi 3 [1][2][3][4][5][6][7][8][9]. The analysis of its magnetic properties shows that the Curie temperatures are very low in comparison to other RT 3 compounds.…”

“…and 6.9 B /f.u., respectively. Partially replacing of Ni atoms by other 3d elements leads to some changes in magnetic properties correlated with their electronic structure [1][2][3][4][5][6][7][8][9].…”

Hyperfine interactions in R x Gd1− x Fe3 intermetallics R = Tb, Y

“…As it was previously reported the values of the total magnetic moment varies with R, e.g in the case of GdFe 3 [1,[5][6][7][8][9][10][11][12]. The substitution within rare earth sublattice may lead to the changes of ff interactions which are mostly realized by 5d−3d hybridization.…”