Reduction of hysteresis loss and large magnetocaloric effect in the C- and H-doped La(Fe, Si)13 compounds around room temperature

Reduction of hysteresis loss and large magnetocaloric effect in the C- and H-doped La(Fe, Si)13 compounds around room temperature
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室温附近 C 和 H 掺杂 La(Fe, Si)13 化合物中磁滞损耗的降低和大磁热效应

DOI:
10.1063/1.3670608
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发表时间:
2012-02
影响因子:
3.2
通讯作者:
--
中科院分区:
物理与天体物理3区
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--
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研究了间隙C和H原子对NaZn_(13)型La(Fe,Si)_(13)化合物的相形成、磁滞损耗和磁热效应的影响。结果发现,获得1:13结构的退火时间从LaFe 11.7Si 1.3的40天显著减少到LaFe 11.7Si 1.3C 0.2的一周。C和H原子的引入可使居里温度调整到室温附近,并使巡游电子变磁转变减弱,导致磁熵变(ΔSM)和磁滞损耗降低。LaFe_(11.7)Si_(1.3)C_(0.2)H_(1.7)在室温下,当磁场变化为5 T时,获得了19.0J/kg K的大-ΔSM,且无磁滞损耗。
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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影响因子: --
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