We report results of measurements of the magnetic susceptibility, the electrical resistivity, the crystal and electronic structures of the polycrystalline intermetallic Gd (Ni_1-xCo_x)₃ compounds. The influence of substitution of Co for Ni atoms is reflected in an increase of the lattice parameters and unit cell volume. The Curie temperature T_C changes between 114 K for GdNi₃ and 615 K for GdCo₃. The electronic structure have been studied by using X-ray Photoelectron Spectroscopy (XPS). The XPS spectra in the valence band region show a hybridization of the states near the Fermi level (E_F). We also observe a remarkable decrease of the density of states near E_F and the shift of 4f Gd peaks in the energy scale for the Co – rich compounds.

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1. Magnetic properties and caloric effect in the Gd(Ni_1-x Fe_x)₃ /Cu nanocomposites