Phase dynamics, structural, and magnetic properties of a Mn2.6Ga1−Sn alloy series
Phase dynamics, structural, and magnetic properties of a Mn2.6Ga1−Sn alloy series
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Mn2 6Ga1âSn 合金系列的相动力学、结构和磁性
DOI：
10.1016/j.jallcom.2018.03.095
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发表时间：
2018
影响因子：
6.2
通讯作者：
S. Wurmehl
中科院分区：
文献类型：
--
作者：
D. Hettmann;W. Löser;C.G.F. Blum;S. Wurmehl
虽然Mn-Ga合金被讨论为新型永磁材料，但存在若干缺点，包括Ga的高价格和太小的饱和磁化强度等等。我们使用了几个指导方针来激励Sn取代Ga来解决这些问题，并探索了Mn2.6Ga1− xSnx合金系列的相形成，结构和磁性。富Sn样品的结构主要由相应的六方和正交相组成，而富Ga样品的结构则由四方DO 22结构组成.然而，只有在适当的退火过程中才能形成四方相。与文献中的讨论相反，我们的实验并没有暗示四氢DO 22结构是亚稳态的，而是表明DO 22结构是平衡相。通常，实验发现的相分数对磁性能和硬磁性能的影响非常迅速地降级，即使只有少量的Ga被Sn取代。这表明仅在富Ga样品中发现的DO 22相确实是与实现高磁各向异性最相关的相。
Although Mn-Ga alloys are discussed as novel permanent magnetic materials, there are several drawbacks, including the high price of Ga and the yet too small saturation magnetization to name a few. We used several guidelines to motivate the replacement of Ga by Sn to tackle these issues and explored the phase formation, structural and magnetic properties of a Mn2.6Ga1−xSnxalloy series. The structure of Sn-rich samples is dominated by the corresponding hexagonal and orthorhombic phases, while the structure of Ga-rich samples shows additional contributions from the tetragonal DO22structure. However, formation of the tetragonal phase happens only upon an appropriate annealing procedure. In contrast to the discussion in the literature, our experiments do not hint on the tetragonal DO22structure being metastable, but rather indicate the DO22structure being an equilibrium phase. In general, the experimentally found phase fractions impact on the magnetic properties and hard magnetic properties are downgraded very rapidly even if only a small amount of Ga is substituted by Sn. This indicates that the DO22phase found only in the Ga-rich samples is indeed the one which is most relevant for realization of high magnetic anisotropy.
影响因子：
6.2
作者：
K. Minakuchi;R. Umetsu;K. Ishida;R. Kainuma
通讯作者：
K. Minakuchi;R. Umetsu;K. Ishida;R. Kainuma
影响因子：
4
作者：
Balke, Benjamin;Fecher, Gerhard H.;Felser, Claudia
通讯作者：
Felser, Claudia