A medium range order structural connection to the configurational heat capacity of borate-silicate mixed glasses
A medium range order structural connection to the configurational heat capacity of borate-silicate mixed glasses
复制标题
硼酸盐-硅酸盐混合玻璃构型热容的中阶结构联系
DOI：
10.1039/c6cp00749j
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发表时间：
2016
影响因子：
3.3
通讯作者：
Yue Yuanzheng
中科院分区：
文献类型：
--
作者：
Liu Hao;Smedskjaer Morten M.;Tao Haizheng;Jensen Lars R.;Zhao Xiujian;Yue Yuanzheng
据报道，随着硼酸盐-硅酸盐混合玻璃中 B2O3/SiO2 比率的增加，构型热容 (Cp,conf) 首先增加，然后变得饱和。通过拉曼光谱测量，我们在这项工作中发现了中程有序 (IRO) 结构与硼酸盐-硅酸盐混合玻璃的 Cp,conf 的成分依赖性之间的联系。在富含二氧化硅的组合物中，Cp,conf 随着 B2O3 含量的增加而迅速增加。这归因于 B–O–Si 网络单元 ([B2Si2O8]2−) 和具有 1 或 2 个 B4 的 6 元硼酸盐环含量的增加。在富硼组合物中，Cp,conf 几乎恒定，与 B2O3/SiO2 比率的增加无关。这可能归因于两种类型的偏硼酸盐基团的分数的减少和其他硼酸盐上层结构单元（特别是六元硼酸盐环）的分数的增加之间的抵消作用。总体结果表明，包含更多类型上层结构单元的玻璃具有更大的 Cp,conf。
It has been reported that the configurational heat capacity (Cp,conf) first increases and then becomes saturated with increasing B2O3/SiO2 ratio in borate–silicate mixed glasses. Through Raman spectroscopy measurements, we have, in this work, found an implication for the intermediate range order (IRO) structural connection to the composition dependence of the Cp,conf of borate–silicate mixed glasses. In the silica-rich compositions, the Cp,conf rapidly increases with increasing B2O3 content. This is attributed to the increase of the content of the B–O–Si network units ([B2Si2O8]2−) and 6-membered borate rings with 1 or 2 B4. In the boron-rich compositions, the Cp,conf is almost constant, independent of the increase in the B2O3/SiO2 ratio. This is likely attributed to the counteraction between the decrease of the fraction of two types of metaborate groups and the increase of the fraction of other borate superstructural units (particularly 6-membered borate rings). The overall results suggest that the glasses containing more types of superstructural units have a larger Cp,conf.