ErCo2雾化颗粒中通过热退火的可调谐磁性和磁热性质
Tunable magnetic and magnetocaloric properties by thermal annealing in ErCo2 atomized particles
摘要：
将磁热材料加工成具有合适形状的磁制冷剂对于磁制冷系统的发展至关重要。在这种情况下，加工对磁热材料的物理性质的影响是重要的问题之一。在这里，我们调查的晶体学，磁性和磁热性能的气体雾化颗粒的金属间化合物ErCo $_{2}$，一个巨大的磁热材料的低温应用。结果表明，ErCo $_{2}$的物理性能显着改变原子化和随后的热退火。在雾化态颗粒中，磁转变温度从34 K升高到56 K，相变从一级转变到二级。热退火使相变温度回到原始温度，并恢复一级相变特性。磁性的变化与晶体学性质的变化密切相关，表明了磁结构耦合的重要性。颗粒的磁熵变$-ΔS_{M}$可以根据退火条件在尺寸、形状和峰值温度方面进行调节。对于0--5 T的磁场变化，$-ΔS_{M}$的峰值在9--33 J kg $^{-1}$ K $^{-1}$的范围内变化。所有的ErCo $_{2}$雾化颗粒的磁热性能可比或优于其他有前途的候选低温磁制冷剂。
英文摘要：
Processing magnetocaloric materials into magnetic refrigerants with appropriate shapes is essential for the development of magnetic refrigeration systems. In this context, the impact of processing on the physical properties of magnetocaloric materials is one of the important issues. Here, we investigate the crystallographic, magnetic, and magnetocaloric properties of gas-atomized particles of the intermetallic compound ErCo$_{2}$, a giant magnetocaloric material for low-temperature applications. The results demonstrate that the physical properties of ErCo$_{2}$ are significantly changed by atomization and subsequent thermal annealing. In the as-atomized particles, the magnetic transition temperature increases from 34 to 56 K and the phase transition changes from first order to second order. The thermal annealing shifts the transition temperature back to the original one and restores the first-order phase transition characteristic. The changes in magnetic properties are closely related to those in crystallographic properties, suggesting the importance of the magneto-structural coupling. The magnetic entropy change $-ΔS_{M}$ of the particles can be tuned in size, shape, and peak temperature depending on the annealing conditions. The peak value of $-ΔS_{M}$ varies in the range of 9--33 J kg$^{-1}$ K$^{-1}$ for a magnetic field change of 0--5 T. All the ErCo$_{2}$ atomized particles have magnetocaloric properties comparable or superior to other promising candidates for low-temperature magnetic refrigerants.
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