Predicting homogeneous nucleation rates in silicate glass-formers
Predicting homogeneous nucleation rates in silicate glass-formers
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预测硅酸盐玻璃形成体的均匀成核率
DOI：
10.1016/j.jnoncrysol.2018.08.002
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发表时间：
2018
影响因子：
3.5
通讯作者：
Edgar Dutra Zanotto
中科院分区：
文献类型：
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作者：
A. Abyzov;V. Fokin;Edgar Dutra Zanotto
我们采用经典成核理论，使用指前常数的特征值和平均（温度依赖的）界面能，并推导出一个表达式来估计最大成核速率Imax，作为约化玻璃化转变温度Tgr <$Tg/Tm的函数（Tgis实验室玻璃化转变温度，Tmis熔点或液相温度）。理论预测是令人惊讶的54硅酸盐玻璃形成者中的51个测试和描述的实验趋势，即Imax强烈降低增加Tgr。这种趋势反过来解释了众所周知的事实，即只有具有相对低的Tgr（Tgr< 0.6）的硅酸盐玻璃在实验室时间/样品尺寸尺度上显示出内部均匀成核。
We employed the Classical Nucleation Theory using a characteristic value of the pre-exponential constant and an average (temperature dependent) interfacial energy and derived an expression to estimate the maximum nucleation rates,Imax, as a function of the reduced glass transition temperatures,Tgr≡Tg/Tm(Tgis the laboratory glass transition temperature andTmis the melting point orliquidustemperature). The theoretical predictions were surprisingly good for 51 out of 54 silicate glass-formers tested and describe well the experimental trend thatImaxstrongly decreases with increasingTgr. This trend, in turn, explains the well-known fact that only silicate glasses having a relatively lowTgr,Tgr< 0.6, show internal homogeneous nucleation in laboratory time/sample-size scales.