Abstract
Microstructure as well as AC and DC thermomagnetic properties were studied for the as‐quenched Gd80Ge15Si5, Gd75Ge15Si5Ni5 and Gd75Ge15Si5Ce5 (wt.%) alloys in a wide range of magnetic fields. The structural investigations performed by X‐ray diffractometry show the presence of Gd‐based phases in the investigated alloys. These results were also confirmed by structure investigations as temperature dependence of specific heat capacity. Besides the crystalline phases discovered in the samples the regions with different atom concentration were observed in Ni and Ce‐containing alloys. The Curie temperature for the Gd80Ge15Si5, Gd75Ge15Si5Ni5 and Gd75Ge15Si5Ce5 alloys is 272, 235, and 284 K, respectively. The magnetocaloric effect (MCE) calculated as magnetic entropy change (−ΔSM) depends on magnetizing field and for the Gd80Ge15Si5 and Gd75Ge15Si5Ni5 alloys reaches almost the same maximum value of 12 J kg−1 K−1. Ce‐containing sample shows about 2.4 times lower MCE than the master alloy.Magnetic entropy change (−ΔSM) versus temperature for the Gd80Ge15Si5, Gd75Ge15Si5Ni5, and Gd75Ge15Si5Ce5 alloys calculated for the maximum magnetizing field of 3 T.
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