arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.11117cond-mat.mtrl-sci
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离子自扩散与铝硅酸盐玻璃化转变反常

Ionic Self-Diffusion and the Glass Transition Anomaly in Aluminosilicates

Achraf Atila, Said Ouaskit, Abdellatif Hasnaoui

摘要:

玻璃化转变温度(Tg)是过冷液体经历动力学停止的温度。通常,玻璃网络改性剂(例如,Na2O)对玻璃化转变温度的影响。然而,在铝硅酸盐玻璃中,不同的改性剂对玻璃的Tg的影响仍然不清楚,并显示出异常的行为。在这里,分子动力学模拟的基础上,我们表明,玻璃化转变温度降低,增加电荷平衡阳离子场强度(FS)的铝硅酸盐玻璃,这是一个异常的行为相比,其他氧化物玻璃。结果表明,这种反常现象的根源来自于高于Tg的过冷液体的动力学,而过冷液体的动力学又与对过剩熵有关。我们的研究结果加深了我们对不同改性剂对铝硅酸盐玻璃性能影响的理解。

英文摘要:

The glass transition temperature (Tg) is the temperature, after which the supercooled liquid undergoes a dynamical arrest. Usually, the glass network modifiers (e.g., Na2O) affect the behavior of Tg. However, in aluminosilicate glasses, the effect of different modifiers on Tg is still unclear and show an anomalous behavior. Here, based on molecular dynamics simulations, we show that the glass transition temperature decreases with increasing charge balancing cations field strength (FS) in the aluminosilicate glasses, which is an anomalous behavior as compared to other oxide glasses. The results show that the origins of this anomaly come from the dynamics of the supercooled liquid above Tg, which in turn is correlated to pair excess entropy. Our results deepen our understanding of the effect of different modifiers on the properties of the aluminosilicate glasses.

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