Tuning the Curie temperature and thermal hysteresis of giant magnetocaloric (MnFe)2PX (X = Ge and Si) compounds by the Ru substitution
Tuning the Curie temperature and thermal hysteresis of giant magnetocaloric (MnFe)2PX (X = Ge and Si) compounds by the Ru substitution
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DOI：
10.7567/jjap.53.063001
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发表时间：
2014-05
影响因子：
1.5
通讯作者：
H. Wada;Koshi Nakamura;K. Katagiri;Takayuki Ohnishi;K. Yamashita;A. Matsushita
中科院分区：
文献类型：
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作者：
H. Wada;Koshi Nakamura;K. Katagiri;Takayuki Ohnishi;K. Yamashita;A. Matsushita
研究了Ru取代对MnFeP_（0.8）Ge_（0.2）和Mn_（1.2）Fe_（0.8）P_（0.5）Si_（0.5）磁热性能的影响。母体化合物在室温附近发生一级磁转变，并伴有约10 K的大的热滞。10-15的替代。%的Ru还原至2-3 K。另一方面，通过高达15%的Ru取代，保留了急剧的磁转变，因此，实现了大的磁熵变和小的磁熵变。发现Ru取代化合物的制冷容量是Gd的1.6-1.8倍。这些结果证明了Ru替代是实现Mn基磁制冷材料的一种有效方法。
Effects of the Ru substitution on magnetocaloric properties have been studied for MnFeP0.8Ge0.2 and Mn1.2Fe0.8P0.5Si0.5. The parent compounds undergo a first-order magnetic transition near room temperature accompanied by a large thermal hysteresis, , of about 10 K. The substitution of 10–15 at. % of Ru reduces down to 2–3 K. On the other hand, a sharp magnetic transition is preserved by the Ru substitution up to 15% and, as a result, a large magnetic entropy change and a small are achieved. It is found that the refrigerant capacity of the Ru substituted compounds is 1.6–1.8 times as large as that of Gd. These results have proved that the Ru substitution is an effective method to realize Mn-based magnetic refrigerant materials.