The phase relations in the Gd–Fe–Ga ternary system at 500°C

The isothermal section of the Nd–Fe–Ga ternary system at 773K

“…An investigation of the Nd-Fe-Ga is a part of a systematical study of the interaction of rare earth metals with gallium and iron. Recently, we reported the isothermal sections of the ternary systems Tb-Fe-Ga [2] and Gd-Fe-Ga [3] at 773 K. The room temperature saturation magnetization for Nd 2 Fe 17−x Ga x increases with increasing Ga concentration, reaching maximum at x = 1.0, and then decreases [4]. Magnetic ordering of the Nd 6 Fe 13−x Ga 1+x (x = 0, 1) compounds studied by neutron diffraction has been reported [5].…”

Isothermal section of the Ho–Fe–Ga ternary system at 773K

“…The lattice of 12 expands in a and b directions and shrinks in c direction comparing to that of HoGa 2 to ensure structural stability. The a/c ratio of 12 and HoGa 2 is about 1.20, and 1.06, respectively. In comparison to the isothermal section at 870 K [9], some salient difference is observed in the isothermal section at 773 K. The solid solution phase HoFe 12 − x Ga x at 773 K crystallizes in the ScFe 6 Ga 6 -type structure (Immm) for x = 5.98-6.76 and in the ThMn 12 -type structure (S.G. I4/mmm) for x = 7.02-7.41 (Fig.…”

“…Therefore, the structure and the composition of Ho(Fe,Ga) 3 ( 4 ) warrants a further confirmation. In addition, it was reported that the structure of R(Fe,Ga) 12 (R = Gd, Tb) [11,12] compound transformed from ThMn 12 -type structure (S.G. I4/mmm) to ScFe 6 Ga 6 -type structure (Immm) with the decrease of the gallium content at 773 K, whereas the ScFe 6 Ga 6 type structure of HoFe 5.9 Ga 6.1 compound was stable up to 1073 K [13]. However, the isothermal section of Ho-Fe-Ga at 870 K showed that the HoFe 12 − x Ga x crystallized in the ThMn 12 -type structure within the whole homogeneity range without any change in structure.…”

“…However, the isothermal section of Ho-Fe-Ga at 870 K showed that the HoFe 12 − x Ga x crystallized in the ThMn 12 -type structure within the whole homogeneity range without any change in structure. A series of isothermal sections at 773 K of R-Fe-Ga tenary system, such as Tb-Fe-Ga [11], Nd-Fe-Ga [14] and Gd-Fe-Ga [12], have been determined by our group. In the Ho-Fe-Ga system, the compounds Ho 2 FeGa 8 and Ho 4 FeGa 12 are heavy fermion materials.…”