Abstract
A series of Ho 1− x Gd x Co 2 ( x = 0, 0.1, 0.2, 0.3, 0.5, 0.6, 0.8, 1) samples were prepared by arc-melting method. The crystal structure, magnetic and magnetocaloric effect were investigated by X-ray powder diffraction and magnetization measurements. Then the magnetic phase transition was analyzed in term of Landau theory. The experimental results indicate that the ordering temperature T C increases from 81 to 402 K with increasing Gd substitution so that T C of the alloy is near room temperature (300 K) when x = 0.6. This Curie temperature increase is accompanied by a reduction of entropy change −Δ S. For an external magnetic field change from 0 to 5 T, −Δ S at T C is 11, 4.65 and 3 J/(kg K) for x = 0.1, 0.3 and 0.6, respectively. The origin and the evolution of magnetocaloric effect in Ho 1− x Gd x Co 2 compounds are discussed.
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