Viscoelastic anomaly accompanying anti-crossing behaviour in liquid As2Se3
Viscoelastic anomaly accompanying anti-crossing behaviour in liquid As2Se3
复制标题
液态 As2Se3 中伴随反交叉行为的粘弹性异常
DOI：
10.1088/1361-648x/aacab5
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
and K. Tamura
中科院分区：
文献类型：
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作者：
M. Inui;A. Q. R. Baron;Y. Kajihara;K. Matsuda;S. Hosokawa;K. Kimura;Y. Tsuchiya;F. Shimojo; M. Yao;S. Tsutsui;D. Ishikawa;and K. Tamura
我们调查的动态结构因子的熔体的著名的玻璃前体，砷2硒3，使用非弹性X射线散射的温度，T，K和动量转移Q从nm− 1。在Q= 2.7 nm− 1（K）处观察到一个异常，在一个简单的模型中，频率的突然变化和线宽的增加让人想起固体中的反交叉。与结构信息的比较，从反向蒙特卡罗模拟的X-射线衍射数据，使我们能够关联的异常在较高的温度下的消失，在每个原子的机械约束的数量下降，MC，让人想起适用于玻璃形成的刚性理论的阈值。据推断，在液体中的分散体中的令人惊讶的跳跃可能与网络玻璃中的刚度转变相关。
We investigate the dynamic structure factor of the melt of the well known glass former, As 2 Se 3, using inelastic x-ray scattering for temperatures, T, K and momentum transfers Q from nm− 1. An anomaly was observed at Q= 2.7 nm− 1 (K) with, in the context of a simple model, both an abrupt change in frequency and an increased linewidth reminiscent of an anti-crossing in a solid. Comparison with structural information from reverse Monte Carlo modeling of x-ray diffraction data allows us to associate the disappearance of the anomaly at higher temperatures with a drop in the number of mechanical constraints per atom, n mc, to reminiscent of the threshold applicable for glass formation in rigidity theory. It is inferred that the surprising jump in the dispersion in the liquid may be correlated with a stiffness transition in a network glass.