Volume relaxation of soda-lime silicate glasses below glass transition temperature
Volume relaxation of soda-lime silicate glasses below glass transition temperature
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DOI：
10.1063/5.0131705
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发表时间：
2023-02
期刊：
影响因子：
1.6
通讯作者：
Y. Hamada;Teppei Murota;M. Shimizu;Y. Shimotsuma;K. Miura
中科院分区：
文献类型：
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作者：
Y. Hamada;Teppei Murota;M. Shimizu;Y. Shimotsuma;K. Miura
结构松弛是玻璃体系中的一种广为人知的现象，至今仍吸引着强烈的工业和研究兴趣。尽管Kohlrausch-Williams-Watts函数很好地描述了与结构松弛有关的体积变化，但它的起源，特别是从玻璃结构的观点来看，并没有明确的定义。为了了解玻璃的结构松弛行为，在本研究中，我们对玻璃化转变温度Tg低于50K的钠钙硅酸盐玻璃进行了体积松弛、拉曼光谱和表面电阻率的测量，这些玻璃的玻璃化转变温度相同，但脆度不同。综合结果表明，在结构松弛过程中，玻璃结构发生了以下变化：(1)SiO_2网络的重组；(2)Na离子从离子通道区域转移到SiO_2网络区域；(3)在改进的随机网络模型中，离子通道区域被分割。
Structural relaxation is a widely known phenomenon that occurs in glassy systems, which still attracts strong industrial and research interest. Although the volume change associated with structural relaxation is well described by the Kohlrausch–Williams–Watts function, its origin, particularly from a glass structural viewpoint, is not clearly defined. To understand the behavior of structural relaxation, in this study, we performed volume relaxation evaluations, Raman spectroscopy assessments, and surface resistivity measurements before and after annealing at 50 K below the glass transition temperature Tg of soda-lime silicate glasses with the same Tg but different fragilities. The combined results indicated that the following changes in the glass structure occurred during the structural relaxation: (1) reorganization of the SiO2 network; (2) transfer of Na ions from the ion channel region into the SiO2 network region; and (3) segmentation of the ion channel region in the modified random network model.