Magnetocaloric effect in La1−xPrxFe10.7Co0.8Si1.5 compounds near room temperature
Magnetocaloric effect in La1−xPrxFe10.7Co0.8Si1.5 compounds near room temperature
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DOI：
10.1088/0022-3727/41/24/245005
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发表时间：
2008-12
期刊：
影响因子：
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通讯作者：
Jun Shen;B. Gao;Q. Dong;Yangxiang Li;F. Hu;Jirong Sun;B. Shen
中科院分区：
文献类型：
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作者：
Jun Shen;B. Gao;Q. Dong;Yangxiang Li;F. Hu;Jirong Sun;B. Shen
研究了NaZn 13型La 1 − xPrxFe 10.7Co 0.8Si 1.5化合物的磁性和磁热效应。用Pr部分取代La，由于晶格收缩，居里温度TC略有降低，但La 1 −xPrxFe10.7Co0.8Si1.5的TC值接近室温。对于磁场变化为0-5 T，La 1-xPrxFe 10.7Co 0.8Si 1.5（x ≤ 0.5）的磁熵变ΔSm的最大值在13.5-14.6 J kg−1 K−1范围内，相应的制冷剂容量（RC）值为373-353 J kg−1。特别是，对于从0到2 T的低场变化，ΔSm和RC的值也分别高达7.0-8.1 J kg−1 K−1和128-139 J kg−1。在La 1-xPrxFe10.7Co0.8Si1.5化合物中没有观察到作为温度和磁场的函数的磁化强度的磁滞现象。大的可逆ΔSm和低场变化下的高可逆RC表明La 1 −xPrxFe10.7Co0.8Si1.5可能是室温附近磁制冷的有希望的候选者。
The magnetic properties and magnetocaloric effects in NaZn13-type La1−xPrxFe10.7Co0.8Si1.5 compounds have been investigated. Partially replacing La with Pr leads to a small reduction in the Curie temperature TC due to the lattice contraction, but the values of TC for La1−xPrxFe10.7Co0.8Si1.5 are close to room temperature. The maximum values of magnetic entropy change ΔSm in La1−xPrxFe10.7Co0.8Si1.5 with x ⩽ 0.5 are in the range 13.5–14.6 J kg−1 K−1 for a field change of 0–5 T, and correspondingly the values of the refrigerant capacity (RC) are 373–353 J kg−1. In particular, the values of ΔSm and RC for a low field change from 0 to 2 T are also obtained to be as high as 7.0–8.1 J kg−1 K−1 and 128–139 J kg−1, respectively. No magnetic hysteresis is observed in the magnetization as a function of both the temperature and the magnetic field in the La1−xPrxFe10.7Co0.8Si1.5 compounds. The large reversible ΔSm and the high reversible RC for a low field change indicate that La1−xPrxFe10.7Co0.8Si1.5 may be a promising candidate for magnetic refrigeration near room temperature.