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Influence of thermal history on the structure and properties of silicate glasses

机译:热历史对硅酸盐玻璃结构和性能的影响

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摘要

We studied a set of float glass samples prepared with different fictive temperatures by previous annealing around the glass transition temperature. We compared the results to previous measurements on a series of amorphous silica samples, also prepared with different fictive temperatures. We showed that the modifications on the structure at a local scale are very small, the changes of physical properties are moderate but the changes on density fluctuations at a nanometer scale are rather large: 12% and 20% in float glass and silica, for relative changes of fictive temperature equal to 13% and 25% respectively. Local order and mechanical properties of silica vary in the opposite way compared to float glass (anomalous behavior) but the density fluctuations in both glasses increase with temperature and fictive temperature. (c) 2006 Elsevier B.V. All rights reserved.
机译:我们研究了一组浮法玻璃样品,这些样品是通过先前在玻璃化转变温度附近进行退火而制备的,具有不同的虚拟温度。我们将结果与之前在一系列虚拟温度下制备的一系列无定形二氧化硅样品的测量结果进行了比较。我们发现,在局部尺度上对结构的修饰很小,物理性质的变化是中等的,但在纳米尺度上密度波动的变化是相当大的:浮法玻璃和二氧化硅中相对密度为12%和20%假想温度的变化分别等于13%和25%。与浮法玻璃(异常行为)相比,二氧化硅的局部有序性和机械性能以相反的方式变化(但行为异常),但两种玻璃的密度波动都随温度和虚拟温度而增加。 (c)2006 Elsevier B.V.保留所有权利。

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