迎接网络玻璃物理学的实验挑战：评估样品均匀性的作用
Meeting experimental challenges to physics of network glasses: assessing role of sample homogeneity
摘要：
我们介绍了一种拉曼光谱分析方法来实时跟踪Ge $_x$ Se $_{100-x}$熔体的均匀化，并表明在950°C和高真空下反应的2g熔体在168小时内均匀化到10μm的尺度。熔体的均匀化对玻璃的自组织有着重要的影响。在本玻璃中，GeSe $_4$单元的拉曼活性角共享模式频率、摩尔体积和Tg下的弛豫焓的组成变化揭示了刚性（xc（1）= 19.5（3）%）和应力（xc（2）= 26.0（3）%）转变相当尖锐（Δx < 0.6%）。这些突然的弹性相变是这些材料所固有的，并且与玻璃的物理性质有直接关系。
英文摘要：
We introduce a Raman profiling method to track homogenization of Ge$_x$Se$_{100-x}$ melts in real time, and show that 2 gram melts reacted at 950°C in high vacuum homogenize in 168 hours on a scale of 10μm. Homogenization of melts is precursive to self-organization of glasses. In the present glasses, compositional variation of Raman active corner-sharing mode frequency of GeSe$_4$ units, molar volumes, and the enthalpy of relaxation at Tg, reveal the rigidity (xc(1)= 19.5(3)%) and the stress (xc(2) = 26.0(3)%) transitions to be rather sharp (Δx < 0.6%). These abrupt elastic phase transitions are intrinsic to these materials and have a direct bearing on physics of glasses.
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