In this work, we further analyze the promising magnetocaloric (NiMnSi)_0.66(Fe₂Ge)_0.34 alloy, which presents isothermal entropy change values as large as 29 J kg⁻¹ K⁻¹ for 2 T at room temperature. It undergoes a magnetostructural transition accompanied by large thermal/magnetic hysteresis, which remains up to high magnetic fields (corroborated by the elaboration of an experimental magnetic phase diagram). We illustrate that this huge hysteretic behavior (i.e. different responses when magnetizing or demagnetizing) can lead to erroneous interpretation of the order of the phase transition by applying the conventional Banerjee's criterion or the recently developed field dependence analysis of the magnetocaloric effect. Additionally, the cyclability of the response is characterized, showing that after several measurements the magnetocaloric response is significantly reduced (by ≈ 40%) due to sample breaking. These dependences together with the large latent heat of the transition (15.0 kJ kg⁻¹) lead to relatively small values of the adiabatic temperature change for powdered samples at moderate field changes, reaching around 0.6 K for 1.75 T by direct measurement methods.

在这项工作中，我们进一步分析了有希望的磁热（NiMnSi）_0.66（Fe ₂ Ge）_0.34合金，其等温熵变值高达29 J kg ^-1  K ^-1在室温下放置2T。它会经历磁结构转变，并伴有较大的热/磁滞，该磁滞仍保持在高磁场下（通过精心制作的实验磁相图得到证实）。我们说明，这种巨大的磁滞行为（即磁化或退磁时的不同响应）会导致通过应用常规Banerjee准则或最近开发的磁热效应场相关分析错误地解释相变的顺序。此外，该响应的可循环性具有特征，表明经过几次测量后，由于样品破裂，磁热响应显着降低（约40％）。这些依赖性以及较大的跃迁潜热（15.0 kJ kg^-1）导致粉状样品在中等场变化下的绝热温度变化值相对较小，通过直接测量方法在1.75 T下达到约0.6K。