The iron-based compounds GdFe_2−x(Cu,Cr)_x (x = 0, 0.1, 0.15 and 0.2) were synthesized successfully by means of arc-melting and annealing at 800 °C for one week. The structural, magnetic and magnetocaloric properties of these intermetallic compounds were investigated systematically in detail using X-ray powder diffraction (XRD) analysis, Scanning electron microscopy (SEM) equipped with Energy dispersive X-ray spectroscopy (EDS), and magnetic measurements. The Rietveld analysis of X-ray diffraction patterns proves that GdFe_2−x(Cu,Cr)_x (x = 0, 0.1, 0.15 and 0.2) compounds crystallize in the cubic laves phase MgCu₂-type structure with the $Fd\bar{3}m$ space group. Gadolinium and iron atoms statistically occupy the 8a and 16d sites respectively. Moreover, copper and chromium atoms substitute the iron atoms at site 8a in the MgCu₂-type structure. The temperature dependence of magnetization studied in a broad temperature range reveals that all compounds exhibit a ferromagnetic-paramagnetic transition at Curie temperature (T_C). We find that the substitution of iron by copper and chromium leads to a decrease in the magnetic ordering transition temperature. The Arrott plots of all our samples show the occurrence of a second-order phase transition. Besides, the performance of magnetocaloric effect (MCE) for GdFe_2−x(Cu,Cr)_x (x = 0, 0.1, 0.15 and 0.2) compounds was evaluated by the magnetic entropy change (ΔS_M) and the related Relative Cooling Power (RCP). In the vicinity of T_C, the ΔS_M reached a maximum value of 0.79 J/kg.K, 1.2 J/kg.K, 1.4 J/kg.K and 2.5 J/kg.K, while the RCP was found to be 13.2 J/kg, 21.6 J/kg, 31.7 J/kg and 44.3 J/kg, respectively for GdFe_2−xCu_x (x = 0, 0.1, 0.15 and 0.2) compounds. Furthermore, the GdFe_2−xCr_x (x = 0.1, 0.15 and 2) compounds show ΔS_M values of about 0.9 J/kg.K, 1.3 J/kg.K and 1.8 J/kg.K, and RCP values of 14.8 J/kg, 25.4 J/kg and 36.8 J/kg respectively, under a field change of 1.56 T. Through these results, the GdFe_2−x(Cu,Cr)_x (x = 0, 0.1, 0.15 and 0.2) compounds can be an attractive materials for use in magnetic refrigeration and heat pumping technology above room temperature.

采用 电弧熔炼和800℃退火1周的方法成功合成了铁基化合物GdFe _{2- x} (Cu,Cr) _x ( x = 0, 0.1, 0.15 and 0.2)。使用 X 射线粉末衍射 (XRD) 分析、配备能量色散 X 射线光谱 (EDS) 的扫描电子显微镜 (SEM) 和磁性测量，系统地详细研究了这些金属间化合物的结构、磁性和磁热性能。X 射线衍射图的 Rietveld 分析证明 GdFe _{2− x} (Cu,Cr) _x ( x  = 0, 0.1, 0.15 和 0.2) 化合物在立方体相 MgCu _{2 中}结晶- 类型结构与 $Fd\bar{3}米$空间群。钆和铁原子在统计上分别占据 8 a和 16 d位点。而且，铜和铬原子的取代在现场8铁原子一个在MGCU ₂型结构。在宽温度范围内研究了磁化强度的温度依赖性表明，所有的化合物显示出在居里温度（铁磁顺磁过渡Ť _Ç）。我们发现铜和铬取代铁导致磁序转变温度降低。我们所有样品的阿罗特图都显示了二阶相变的发生。此外，GdFe _{2− x}的磁热效应 (MCE) 性能(Cu,Cr) _x ( x  = 0, 0.1, 0.15 和 0.2) 化合物通过磁熵变 (Δ S _M ) 和相关的相对冷却功率 (RCP)进行评估。在T _C附近，Δ S _M达到最大值 0.79 J/kg.K、1.2 J/kg.K、1.4 J/kg.K 和 2.5 J/kg.K，而 RCP 被发现对于 GdFe _{2− x} Cu _x ( x  = 0、0.1、0.15 和 0.2) 化合物，分别为 13.2 J/kg、21.6 J/kg、31.7 J/kg 和 44.3 J/kg 。此外，GdFe _{2− x} Cr _x ( x  = 0.1, 0.15 和 2) 化合物显示出 Δ S _M在 1.56 的场变化下，其值分别约为 0.9 J/kg.K、1.3 J/kg.K 和 1.8 J/kg.K，RCP 值分别为 14.8 J/kg、25.4 J/kg 和 36.8 J/kg T. 通过这些结果，GdFe _{2− x} (Cu,Cr) _x ( x  = 0, 0.1, 0.15 和 0.2) 化合物可以成为用于室温以上磁制冷和热泵技术的有吸引力的材料。