**4. Conclusion**

In this work, we used the derivative of the Gibbs free energy to estimate the magnetic entropy change and the mean-field theory to sort out the spontaneous magnetization from the dependence of magnetic entropy change on magnetization, ð Þ �ΔSM vs. *<sup>M</sup>*<sup>2</sup> in Gd3Ni2 and Gd3CoNi systems. The obtained spontaneous magnetization values are in good agreement with those found from the extrapolation from the Arrott plots (*H*/*M* vs. *M*<sup>2</sup> ). An excellent agreement has been found between the ð Þ �ΔSM values estimated by Landau theory and those obtained using the classical Maxwell relation. The intermetallic Gd3Ni2 and Gd3CoNi exhibit a large MCE manifested with hight entropic peak at the vicinity of *TC* and boost refrigerant capacity which make these alloys as a good candidate for magnetic refrigerator.
