Abstract In this work, we study the relaxation behavior of a densified sodium aluminoborate glass by means of coupled Raman spectroscopy, Brillouin spectroscopy, and differential scanning calorimetry analyses. First, we show that the changes in elastic properties upon densification are largely associated with structural modifications in the glass network at short- and medium-range orders. Then, the evolution of the structural and elastic properties of the densified glass has been monitored in situ in the coupled DSC-Brillouin-Raman setup during isothermal annealing at different temperatures below the glass transition temperature. The stretched exponential function is found to well describe the observed relaxation kinetics, however, the stretching factor β varies non-monotonically with temperature. In contrast, the Arrhenius behavior of the characteristic decay times is deduced by lifetime distribution analysis, revealing three different relaxation processes with typical activation energies of 170±25, 200±5, and 280±15 kJ/mol. The relative contributions of these processes to the overall relaxation kinetics are found to vary with the temperature as well as the type of parameter considered (structural, elastic, or thermal), and hence, the relaxation kinetics cannot be properly understood using the stretched exponent function. The possible origins of the different relaxation processes are discussed.

中文翻译：

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致密化铝硼酸钠玻璃的弛豫行为

摘要 在这项工作中，我们通过耦合拉曼光谱、布里渊光谱和差示扫描量热分析研究了致密化铝硼酸钠玻璃的弛豫行为。首先，我们表明致密化时弹性性能的变化在很大程度上与短程和中程级玻璃网络的结构变化有关。然后，在低于玻璃化转变温度的不同温度下等温退火期间，在耦合 DSC-布里渊-拉曼装置中原位监测了致密玻璃的结构和弹性性能的演变。发现拉伸指数函数很好地描述了观察到的松弛动力学，然而，拉伸因子 β 随温度非单调变化。相比之下，通过寿命分布分析推导出特征衰减时间的 Arrhenius 行为，揭示了三种不同的弛豫过程，典型活化能为 170±25、200±5 和 280±15 kJ/mol。发现这些过程对整体松弛动力学的相对贡献随温度以及考虑的参数类型（结构、弹性或热）而变化，因此，使用拉伸指数函数无法正确理解松弛动力学. 讨论了不同松弛过程的可能起源。发现这些过程对整体松弛动力学的相对贡献随温度以及考虑的参数类型（结构、弹性或热）而变化，因此，使用拉伸指数函数无法正确理解松弛动力学. 讨论了不同松弛过程的可能起源。发现这些过程对整体松弛动力学的相对贡献随温度以及所考虑参数的类型（结构、弹性或热）而变化，因此，使用拉伸指数函数无法正确理解松弛动力学. 讨论了不同松弛过程的可能起源。