We report on the critical magnetic behaviour, universality class and magnetocaloric properties of Mn_0.7Fe_0.3Co_0.7Fe_0.3Ge. At room temperature, the alloy is found to crystallize in the hexagonal structure of Ni₂In-type. Paramagnetic to ferromagnetic phase transition is found to occur at a Curie temperature of about 298 K. The saturation magnetization value at low temperatures is about 2.79 μ_B/f.u. Kouvel-Fisher and modified Arrott's Plot methods along with magnetocaloric method are implemented to determine the critical exponents which are found to be self-consistent. The critical exponents suggest short range magnetic interactions with 3D-Heisenberg universality class of the alloy as inferred from the relation$J\left(r\right)~1/r^{5.02}$. Around the Curie temperature, the maximum change in the magnetic entropy, under the influence of 90 kOe, is about −3.91 J kg⁻¹ K⁻¹.

我们报告了Mn _0.7 Fe _0.3 Co _0.7 Fe _0.3 Ge的临界磁行为，通用性和磁热性能。在室温下，发现该合金以Ni ₂ In型的六边形结构结晶。顺磁到铁磁相转变被发现在约298 K的饱和磁化值的在低温下的居里温度发生约2.79 μ_乙/ fu Kouvel-Fisher和改进的Arrott图解法以及磁热法一起用于确定被发现是自洽的临界指数。临界指数表明与合金的3D-Heisenberg通用性类别具有短程磁性相互作用$Ĵ（\mathrm{[R}）〜\mathrm{1个}/{\mathrm{[R}}^{5.02}$。在居里温度附近，在90 kOe的影响下，磁熵的最大变化约为-3.91 J kg ^-1  K ^-1。