Magnetic properties, magnetocaloric effect, and critical behavior of Fe_84-xCr_2+xB₂Co₂Zr₁₀ (x = 1, 2, 3, 4, 5, and 6) rapidly quenched alloy ribbons prepared by melt-spinning method have been investigated. X-ray diffraction analysis shows that the ribbons are almost amorphous. All the ribbons exhibit soft magnetic behavior with a low coercivity, H_c < 20 Oe. The magnetic phase transition temperature of the alloy can be adjusted in the room temperature region by appropriate Cr concentrations. With increasing Cr concentration, Curie temperature (T_C) of the alloys is reduced from 330 K (for x = 1) to 290 K (for x = 6). The quite high maximum magnetic entropy change, |ΔS_m|_max > 0.8 J.kg⁻¹.K⁻¹ (under a magnetic field change of 12 kOe), and the wide working temperature range, δT > 90 K, around room temperature, have been achieved on these alloy ribbons. The obtained results reveal that Fe_84-xCr_2+xB₂Co₂Zr₁₀ alloys are potential candidates for the magnetic refrigerants at room temperature region. Using the Arrott-Noakes method, critical analyses around the ferromagnetic-paramagnetic phase transition elucidated the magnetic orders in the alloys. The critical parameters determined for Fe_84-xCr_2+xB₂Co₂Zr₁₀ ribbons are close to those of the mean-field theory applied for the long-range ferromagnetic orders.

Fe _{84- x} Cr _{2+ x} B ₂ Co ₂ Zr ₁₀（x  = 1，2，3，4，5，6）通过熔体纺丝法制备的快速淬火合金_薄带的磁性能，磁热效应和临界行为已被调查。X射线衍射分析表明，带几乎是无定形的。所有带均表现出软磁特性，矫顽力低，H _c  <20 Oe。合金的磁性相变温度可以通过适当的Cr浓度在室温范围内调节。随着铬浓度的增加，居里温度（T _C）的合金从330 K（对于x  = 1）减少到290 K（对于x  = 6）。相当高的最大磁熵变，| Δ小号_米|  在这些合金薄带上已实现_最大 > 0.8 J.kg ^-1 .K ^-1（在12 kOe的磁场变化下），并且在室温附近实现了宽的工作温度范围δT > 90K 。所得结果表明，Fe _{84- x} Cr _{2+ x} B ₂ Co ₂ Zr ₁₀合金是室温区域磁性制冷剂的潜在候选者。使用Arrott-Noakes方法，围绕铁磁-顺磁相变的关键分析阐明了合金中的磁序。Fe _{84- x} Cr _{2+ x} B ₂ Co ₂ Zr _10薄带确定的临界参数与应用于长距离铁磁阶的平均场理论的临界参数接近。