Calculation of the atomic volumes of FeNi and FeCo alloys

Abstract

The concentration dependence of the average atomic volume of f.c.c. and b.c.c. FeNi and FeCo alloys has been calculated at 300 K over the entire concentration range. The large deviations from linearity in these alloy systems are attributed solely to changes in the atomic magnetic moment μ of the Fe atoms. The volume V of an Fe atom depends on its moment μ through the relation V = V0 (μ = 0) + k μ2, where k is an atomic constant independent of the alloy structure and the environment of the Fe atom.

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

“…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].…”

Magnetic properties and magnetocaloric effect in Gd(Ni1−xCox)3 intermetallic compounds

“…This variation is probably connected with the substitution of T elements in the preferred position in 3d sublattice. Similar behaviour was already observed for Fe-Co and Fe-Ni alloys [11][12][13][14][15][27][28][29]. Moreover the Ni/T replacement causes the increase in T C as well as a decrease in magnetic moment [7,[13][14][15].…”

“…Recently the research on the MCE has developed considered interest not only in Gd-rich but also in other rare earth based compounds such as RT 2 (R = Er, Ho, Dy, Tb, Gd; T = Co, Ni, Al) [19][20][21][22][23][24][25][26] and RNi 5 (R = Gd, Er, Ho, Dy, Tb) [27]. The RT 3 group of compounds seems to be also appropriate materials for investigating the MCE.…”

Magnetization–structure–composition phase diagram mapping in Co-Fe-Ni alloys using diffusion multiples and scanning Hall probe microscopy

“…However, there was no justification for this assumption and, in fact, our higher density measurements indicate that the curve is not symmetric near 28 at% of Co. Our data on FeCo (as well as other bulk alloys) are also in quantitative agreement with the measurements of ultrathin 3d transition-metal binary alloys 36 . Obtaining precise results with SHPM for the composition of the saturation magnetization maximum is important for a comparison with the Slater-Pauling curve 36 , average atomic volume calculations in Fe–Co and Fe–Ni alloys 37 , as well as first principle band structure calculations in transition metal ferromagnets 38 , 39 .…”