We have studied the effect of phase separation on the magnetic and magneto-caloric properties of the CoFeNi_0.5Cr_0.5-Al_x (x = 0.0, 1.0 and, 1.5) system. Results show that a collaborative behaviour among FeCr-rich segregated nanoparticles (NPs) increases the saturation magnetisation (M_s) while the Curie temperature (T_c) is controlled by the amount of added Al. With a strong ferromagnetic coupling between segregated FeCr-NPs, the CoFeNi_0.5Cr_0.5-Al_1.0 sample shows the highest M_s (100 Am² kg⁻¹) with an increase of 61% over the Al-free CoFeNi_0.5Cr_0.5 sample. It is argued that as the ferromagnetic interaction increases in a degenerated superspin-glass-like state of the NPs the field induced phase transition is broadened while the magnetic entropy decreases. In turn, the CoFeNi_0.5Cr_0.5-Al_1.0 sample shows the highest refrigerant capacity (17.1 J kg⁻¹ at μ₀ΔH = 1.0 T), and the smallest measured magnetic entropy change (ΔS_m^peak = 0.22 J kg⁻¹ K⁻¹). We found that the enhanced magnetic and refrigerant capacity by mean of phase separation and NPs clustering are among the highest reported for the multicomponent alloys being investigated for energy applications in the high temperature range.

我们已经研究了相分离对CoFeNi _0.5 Cr _0.5 -Al _x（x = 0.0、1.0和1.5）系统的磁和磁热性能的影响。结果表明，富FeCr的分离纳米颗粒（NPs）之间的协同行为增加了饱和磁化强度（M _s），而居里温度（T _c）受Al的添加量控制。由于在分离的FeCr-NP之间存在强铁磁耦合，CoFeNi _0.5 Cr _0.5 -Al _1.0样品显示出最高的M _s（100 Am ²  kg ^-1）比不含Al的CoFeNi _0.5 Cr _0.5样品增加了61％。有人认为，随着纳米粒子的退化的超自旋玻璃状态中铁磁相互作用的增加，场致相变变宽，而磁熵变减小。反过来，CoFeNi _0.5铬_0.5 -Al _1.0样本显示最高的制冷剂容量（17.1Ĵ千克^-1在μ ₀ ΔH  = 1.0 T），并且最小的测量磁熵变（ΔS_米^峰 = 0.22Ĵ千克^-1  ķ ^-1）。我们发现，通过相分离和NPs团簇增强的磁和制冷剂容量是所研究的多组分合金在高温范围内进行能源应用研究的最高报告之一。