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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Investigation of the role of Mg and Ca in the structure and durability of aluminoborosilicate glass
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Investigation of the role of Mg and Ca in the structure and durability of aluminoborosilicate glass

机译：MG和CA在铝硼硅酸盐玻璃结构和耐久性的研究

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摘要

The structure and dissolution behaviour of Na2O center dot CaO center dot(15-x)Al2O3 center dot xB(2)O(3)center dot SiO2 and Na2O center dot MgO center dot(15-x)Al2O3 center dot xB(2)O(3)center dot SiO2 glasses, relevant to compositions of UK nuclear waste glass, have been investigated using nuclear magnetic resonance (NMR) spectroscopy and static dissolution experiments using the PCT protocol. Structural data from B-11, Al-27 and Si-29 NMR analyses show that increasing the [B2O3]/([Al2O3] + [B2O3]) ratio of the alkali-alkaline-earth aluminoborosilicate glasses led to an overall decrease in the proportion of non-silicate tetrahedral species (Al-IV + B-IV) and a decrease in Si-O-X bonds(X=B, Al). The Mg-containing glasses exhibited lower B-IV fractions than their Ca-containing counterparts, which is thought to be due to the presence of Mg-IV tetrahedra in the network. The measured corrosion rates were similar for both Ca and Mg-containing glasses although unexpectedly some Ca-containing glasses exhibited higher corrosion losses than the Mg-containing ones for time periods up to 112 d. However, there was evidence of a greater tendency to rate resumption in the Mg containing than the Ca containing ones. Alteration products were found to contain Ca, Si and Al with the Ca containing glasses and Ca, Mg, Si and Al with the Mg containing glasses; Na was not detected in the alteration products although its presence cannot be ruled out based on the data obtained.
机译：Na2o中心点Cao中心点（15-x）Al2O3中心点Xb（2）O（3）中心点SiO2和Na2O中心点MgO中心点（15-x）Al2O3中心点Xb（2）的结构和溶出行为O（3）与英国核废料玻璃组成相关的中心点SiO2眼镜，使用PCT协议使用核磁共振（NMR）光谱和静态溶解实验研究。来自B-11，Al-27和Si-29 NMR分析的结构数据表明，碱 - 碱土铝硼硅酸盐玻璃的比例增加了碱 - 碱 - 土铝丙烯酸硅硅酸盐玻璃的总体减少非硅酸盐四面体（Al-IV + B-IV）的比例和Si-ox键的减少（X = B，Al）。含Mg的玻璃比其含Ca的对应物显示出低于B-IV级分，这被认为是由于网络中的MG-IV Tetrahedra的存在。对于含Ca和含镁的玻璃，测量的腐蚀速率类似于含Ca和Mg的眼镜，尽管含有一些含Ca的玻璃含量比含Mg的腐蚀损失高达112天。然而，有证据表明含有比含有Ca含量的Mg恢复倾向。发现改变产物含有含Ca，Si和Al的含Ca，含Ca，Mg，Si和Al，用Mg含有含量的眼镜;在改变产品中未检测到NA，尽管其存在不能根据所获得的数据排除。

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