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We have studied the magnetic coupling property, magnetic entropy change, and magnetic phase transition behavior of ternary alloy Ce 1. 3 Pr 0. 7 Co 7 . It exhibits a typical paramagnetic–ferromagnetic phase transition at T C = 2 1 8  K and this phase transition is verified to be second order by the scaling theory. Based on the data of isothermal magnetization measured around T C , we obtained the variation of its magnetic entropy change under the different magnetic fields but it only shows a smaller entropy change value. Density functional calculations confirm that the extra magnetic interaction originates from the Pr-Pr exchange interactions, which yields anomalous magnetic coupling with Co-Co (Ce-Ce) exchange interactions. One phenomenological model is suggested to understand anomalous magnetic behavior observed in the present intermetallic compounds. [ABSTRACT FROM AUTHOR]