Abstract
The crystal structure, magnetic and magnetothermal properties of non-stoichiometric TbCo2Mnx and TbCo2Nix alloys were studied. It was shown that single-phase compounds with the MgCu2-type structure exist up to a certain content of x (x < 0.4 for compounds with Mn and x ≤ 0.1 for compounds with Ni). The concentration changes of the lattice parameter, Curie temperature, magnetic moment of the 3d sublattice in TbCo2Mnx and TbCo2Nix alloys were compared. The magnetocaloric effect in alloys were estimated using data of magnetic and heat capacity measurements.
Highlights
New non-stoichiometric RM2Mnx compounds (R - rare-earth metal, M - 3d transition metal Ni, Co) are revealed and their physical properties are actively investigated [1,2,3,4,5,6,7]
We can assume that the increase in the Curie temperature, which is observed with increasing manganese content, is due to the increase in the magnetic moment of cobalt, which may result from changes in the electron structure of the compounds
Our study showed that single-phase non-stoichiometric TbCo2Nix compounds with MgCu2-type structure exist at a low nickel concentration x ≤ 0.1
Summary
New non-stoichiometric RM2Mnx compounds (R - rare-earth metal, M - 3d transition metal Ni, Co) are revealed and their physical properties are actively investigated [1,2,3,4,5,6,7]. The concentration changes of the lattice parameter, Curie temperature, magnetic moment of the 3d sublattice in TbCo2Mnx and TbCo2Nix alloys were compared.
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