Large reversible entropy change at the inverse magnetocaloric effect in Ni-Co-Mn-Ga-In magnetic shape memory alloys
Large reversible entropy change at the inverse magnetocaloric effect in Ni-Co-Mn-Ga-In magnetic shape memory alloys
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DOI：
10.1063/1.4808340
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发表时间：
2013-06
影响因子：
3.2
通讯作者：
B. Emre;Süheyla Yüce;E. Stern-Taulats;A. Planes;S. Fabbrici;F. Albertini;L. Mañosa
中科院分区：
文献类型：
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作者：
B. Emre;Süheyla Yüce;E. Stern-Taulats;A. Planes;S. Fabbrici;F. Albertini;L. Mañosa
磁场下的量热法已用于研究 Ni-Co-Mn-Ga-In 磁性形状记忆合金的逆磁热效应。结果表明，在完整转变循环期间耗散的能量仅代表马氏体转变潜热的一小部分（5% 至 7%）。结果发现，等温场温度扫描得到的熵值与等温磁场扫描得到的熵值非常吻合。通过等温测量研究了磁热效应的再现性。在由零场正向跃迁起始温度和施加场下反向跃迁起始温度界定的温度区间内，已经发现了场循环下可再现的熵值。对于高达 6 T 的场，已发现约 11 J/kg K 的大可逆熵变化。
Calorimetry under magnetic field has been used to study the inverse magnetocaloric effect in Ni-Co-Mn-Ga-In magnetic shape memory alloys. It is shown that the energy dissipated during a complete transformation loop only represents a small fraction (5% to 7%) of the latent heat of the martensitic transition. It is found that the entropy values obtained from isofield temperature scans agree well with those obtained from isothermal magnetic field scans. The reproducibility of the magnetocaloric effect has been studied from isothermal measurements. Reproducible entropy values under field cycling have been found within a temperature interval bounded by the start temperature of the forward transition at zero field and the start temperature of the reverse transition under applied field. Large reversible entropy changes around 11 J/kg K have been found for fields up to 6 T.