In this work the results of measurements of heat capacity (C P ) and magnetocaloric effect (MCE) in Er(Co 1-x Fe x ) 2 system in the concentration range 0.07 ≤ x ≤ 0.80 are presented. Phase composition was controlled by X-ray difraction analysis. Heat capacity was measured in the temperature range 77-320 K. MCE has been studied within the temperature range 5-670 K in magnetic fields up to 70 kOe. It was found that Fe concentration increase caused the table-like (plateau) MCE temperature dependence for both magnetic entropy change date and direct ΔT-effect measurements independently on Fe concentration. The possible reasons of such behavior are discussed.

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A study of crystalline structure, magnetic and magnetocaloric properties of Ho(Co1−xFex)2 (x = 0.09, 0.12) intermetallic compounds has been undertaken. Phase composition was controlled by X-ray diraction analysis.Magnetic properties were measured within the temperature range 4.2350 K in magnetic elds up to 7 T. Magnetic ordering temperatures corresponding to paramagneticferrimagnetic phase transitions were found to be 199 K and 258 K respectively. Temperature dependences of heat capacity for these compounds have been inferred for the temperature interval 77340 K. Comparison of magnetocaloric eect (MCE) values determined by direct measurement and by calculation was carried out as well. It was found that signicant MCE peak broadening occurs for higher iron concentration in the compound.