居里温度在FeSiBPC玻璃亚t_g弛豫中的钉钉效应

Xi Zhao, S. Lan, Lina Hu, Zhen-Duo Wu, Yaqiang Dong, Yang Ren, Xun-li Wang
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摘要

采用差示扫描量热法和原位高能同步x射线衍射相结合的方法,系统地研究了多组分FeSiBPC金属玻璃(mg)的亚T g弛豫。在一系列铁基mg中观察到两阶段弛豫行为,表明居里温度的钉钉效应。这种行为的根源在于局部结构在退火过程中由短程有序向中程有序的偏离。衍射和热物理数据分析表明,β弛豫的结构有序受到限制,同时磁有序也促进了β弛豫的发生。主要是原子的中程重排对磁有序产生影响。这项工作为弛豫过程中结构排列与本磁有序之间的相互作用提供了新的见解,并有助于理解mg中内磁影响的β弛豫。
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Pinning Effect of Curie Temperature in the Sub-T g Relaxation of FeSiBPC Glasses
By combining Differential Scanning Calorimetry and in-situ high-energy synchrotron X-ray diffraction, the sub- T g relaxation of multicomponent FeSiBPC metallic glasses (MGs) has been systematically investigated. A two-stage relaxation behaviour in a series of Fe-based MGs has been observed, indicating the pinning effect of Curie temperature. The origin of this behavior resides in the local structure departure from short-range order to medium-range order upon annealing. Analysis of diffraction and thermophysical data shows that the structural ordering involved in the β relaxation is confined and, meanwhile, facilitated by the magnetic ordering. It is mainly the medium-range rearrangements of atoms that yield the influence on magnetic ordering. This work provides new insights into the interaction between structural arrangement during relaxation and intrinsic magnetic ordering and helps to understand the inner magnet-influenced β relaxation in MGs.
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