磁制冷
材料科学
居里温度
退火(玻璃)
磁滞
凝聚态物理
磁滞
兴奋剂
磁场
热滞后
电子
相变
磁化
铁磁性
冶金
光电子学
物理
量子力学
作者
H. Zhang,Baogen Shen,Zhiyi Xu,Xinqi Zheng,Jun Shen,Fengxia Hu,Jirong Sun,Youwen Long
摘要
The effects of the interstitial C and H atoms on the phase formation, the hysteresis loss, and magnetocaloric effects of the NaZn13-type La(Fe, Si)13 compounds are investigated. It is found that the annealing time to obtain a 1:13 structure is significantly reduced from 40 days for LaFe11.7Si1.3 to a week for LaFe11.7Si1.3C0.2. The introduction of C and H atoms can adjust Curie temperature to around room temperature and leads to the decrease in magnetic entropy change (ΔSM) and magnetic hysteresis loss due to the weakening of itinerant-electron metamagnetic transition. Large −ΔSM of 19.0 J/kg K at room temperature without hysteresis loss for LaFe11.7Si1.3C0.2H1.7 is obtained for a field change of 5 T.
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