Abstract
The polycrystalline YNiAl4-type GdNiGa4 (space group Cmcm, N 63, oC24), CeCu2-type GdNi0.5Ga1.5 (space group Imma, N 74, oI12) and TiNiSi-type GdNiGa (space group Pnma, N 62, oP12) are prepared by arc melting with following annealing. The magnetic ordering and magnetocaloric effects of these compounds have been investigated using magnetic measurements in fields up to 90 kOe GdNiGa4 shows field insensitive antiferromagnetic ordering below TN = 12 K, GdNi0.5Ga1.5 demonstrate ferromagnetic ordering below TC = 36 K and low-temperature field-sensitive ferro-antiferromagnetic ordering (Tm) in the range of 12–32 K, while GdNiGa exhibits ferromagnetic ordering below TC = 28 K. The saturation magnetizations at 2 K indicate a collinear ferromagnetic ordering of Gd-sublattice in GdNi0.5Ga1.5 and GdNiGa. The transformation of crystal lattice from GdNi0.5Ga1.5 to GdNiGa with ordering of Ni-sublattice leads to a remarkable increasing of magnetic entropy change and magnetocaloric effect. The structural and magnetic features of ternary Gd-Ni-Ga compounds are discussed.
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