Magnetic properties and phase stability of Co2Cr(Ga, Si) Heusler alloys
Magnetic properties and phase stability of Co2Cr(Ga, Si) Heusler alloys
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Co2Cr(Ga, Si) Heusler合金的磁性能和相稳定性
DOI：
10.1016/j.jallcom.2013.10.209
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发表时间：
2014
影响因子：
6.2
通讯作者：
R. Kainuma
中科院分区：
文献类型：
--
作者：
R. Y. Umetsu;A. Okubo;X. Xu;R. Kainuma
建立了Heusler合金Co2 Cr（Ga 1− xSix）的相图、磁性和单相区。在x ≤ 0.5的组成范围内，得到了单一的相，从L21相到B2相的有序-无序相变温度TtL 21/B 2随x的增加几乎呈线性增加。用浓度线性外推法估算出L2 1型Co2 CrSi Heusler合金的TtL 2 1/B 2值约为1450 K，高于Co2 CrAl和Co2 CrGa合金。居里温度T C也随着x的增加而增加，在x= 0.5时为600 K，从而反映了价电子数变化引起的磁矩增加。的浓度依赖性的自发磁矩，M s，在5 K下测得的增加，随着x的增加，几乎遵循广义斯莱特-鲍林（SP）规则预测的Galanakis等人。
The phase diagram, magnetic properties and the region over which the Heusler alloys Co 2 Cr (Ga 1− x Si x) occur as a single phase have been established. A single phase was obtained in the composition range of x⩽ 0.5, in which the order–disorder phase transition temperature from the L2 1 to the B2 phase, T t L 21/B 2, increased almost linearly with increasing x. The value of T t L 21/B 2 for the L2 1-type Co 2 CrSi Heusler alloy, estimated by linear extrapolation from its concentration dependence, was about 1450 K, and therefore higher than that of Co 2 CrAl and Co 2 CrGa. The Curie temperature, T C, also increased with increasing x becoming 600 K at x= 0.5, thus reflecting an increase in the magnetic moment caused by the change in the number of the valence electrons. The concentration dependence of the spontaneous magnetic moment, M s, measured at 5 K increased with increasing x, almost following the generalized Slater–Pauling (SP) rule predicted by Galanakis et al.