Structure, magnetic and magnetothermal properties of the non-stoichiometric ErCo2Mn alloys

Tuning the magnetic and structural transitions in TbCo2Mnx compounds

“…Recently, it was reported that RCo 2 Mn with R = Ho and Er also crystallize in the cubic MgCu 2 -type structure [2]. It was found that the introduction of Mn into RT 2 (T is 3d or 4d transition metal) compounds led to a significant modification of magnetic properties such as the Curie temperature [2,4,[7][8][9][10][11], magnetic entropy change [4], saturation moment [2], the nature of the magnetic transition [4], and so on. It is accepted that the Curie temperature can be raised significantly with Mn doping due to the enhanced 3d transition-metal ion interactions [5,6].…”

“…It is accepted that the Curie temperature can be raised significantly with Mn doping due to the enhanced 3d transition-metal ion interactions [5,6]. It is of interest that the RT 2 Mn compounds were isostructural to RT 2 with the * jianli@uow.edu.au † cheng@uow.edu.au MgCu 2 -type structure, although the ratio of the R to T is 1:3 [2,4,[7][8][9][10][11], and the Mn was observed to occupy both the R and T sites. All the above modified magnetic properties and crystal structure inspired more work on related series materials such as ErCo 2 Mn [2], HoNi 2 Mn [9], DyNi 2 Mn [5,6], and TbNi 2 Mn [6,7].…”

“…When the Mn concentration increases to a certain level (x 0.35), a second phase with rhombohedral PuNi 3 -type (R3m) structure starts to form [10]. Recently, the investigation on ErCo 2 Mn x (x = 0 to 0.8) also found that, when x 0.8, the alloys are almost single phase (MgCu 2 -type Laves-phase structure), while a second phase with cubic Th 6 Mn 23 -type structure appears for larger x values [11].…”

Magnetic properties of the non-stoichiometric TbCo2Nix alloys

“…3, concentration dependence of the Curie temperature increases sharply at small Ni concentrations and has maximum at T = 233 K. With further increasing the Ni content, the concentration dependence of the T C decreases. The Curie temperature of ErCo 2 Mn x compounds monotonically increases and reaches maximum value 212 K at manganese concentration x = 0.6 [6].…”

“…The Curie temperatures T C are considerably higher for the RNi 2 Mn alloys in comparison with T C for corresponding binary RNi 2 and RMn 2 . Later, the structure and magnetic properties of the non-stoichiometric RM 2 Mn x (0 ≤ x ≤ 1.5) compounds with R = Tb, Dy, Gd were studied [4][5][6][7]. It was shown that the MgCu 2 -type structure exists up to the manganese content x = 0.8 for ErCo 2 Mn x and up to x = 1.5 for ErNi 2 Mn x .…”