期刊
RARE METALS
卷 36, 期 7, 页码 601-606出版社
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-016-0819-z
关键词
Magnetocaloric effect; Second-order magnetic transition; Arrott plot; Isothermal entropy change
资金
- National Natural Science Foundation of China [11404186, 11364035, 51371111, 11304274]
- Applied Basic Research Foundation of Yunnan Province [2012FD051]
- Project for Innovative Research Team of Qujing Normal University [TD201301]
- Key Basic Research Program of Science and Technology Commission of Shanghai Municipality [13JC1402400]
Hexagonal MnNiGe-based alloys are a series of novel functional materials with potential magnetostructural transitions (MSTs). Accordingly, it was investigated the magnetic features of bulk hexagonal MnNiGa alloy and attempted to partially substitute Mn by Co atoms to tailor its structural and magnetic properties. Nonetheless, the introduction of magnetic Co atom fails to bring about the first-order phase transition and gives rise to the emergence of second phase with cubic structure instead. For ternary MnNiGa parent alloy, the second-order nature of transition is confirmed by both the absence of thermal hysteresis and the standard Arrott plot. To the end, the values of isothermal entropy change are determined by Maxwell relation, and the maximal values follow the trend predicted by the mean-field theory. Its broad transition region (similar to 53 K) leads to only a very small value of entropy change (similar to 2.4 J center dot kg(-1)center dot K-1 at a field change of 3 T). In turn, the wide transition ensures a relative large refrigerant capacity (similar to 89.4 J center dot kg(-1)), which is comparable to that of MnNiGe-based systems. Although the substitution of Co for Mn site is unsuccessful, the chemically modified MnNiGa is still a promising candidate for the application of magnetocaloric effect (MCE) with merits of higher magnetization and better mechanical performance than MnNiGe-based systems.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据