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磁性蓄冷材料Fr_3Ni在液氦温区的回热式低温制冷机中已经被广泛应用,在以He-H_2混合气体为工质的脉管制冷实验中发现Er_3Ni与H_2会发生反应,其产物在一定程度上提高了制冷机的性能。本文基于金属储氢过程的理论框架,分析了Er_3Ni吸氢的机理,并推算了Er_3Ni的理论吸氢量。对Er_3Ni在室温条件下的吸氢量进行了实验测量,结果显示Er_3Ni经活化后能与H_2充分反应,并生成氢化物Er_3NiH_8,与理论推算结果非常吻合。
The magnetic regenerative material Fr_3Ni has been widely used in the regenerative cryogenic refrigerator with the liquid helium temperature. It was found that the reaction of Er_3Ni with H_2 was found in the experiment of pulse tube cooling with He-H_2 mixed gas as the working fluid. To a certain extent, improve the performance of the refrigerator. Based on the theoretical framework of hydrogen storage process, the mechanism of hydrogen absorption by Er_3Ni was analyzed and the theoretical hydrogen absorption of Er_3Ni was deduced. Hydrogen absorption of Er_3Ni at room temperature has been measured. The results show that Er_3Ni can fully react with H_2 and generate Er_3NiH_8 hydride, which is in good agreement with the theoretical calculation.