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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 >Structural influence of PbO by means of FTIR and acoustics on calcium alumino-borosilicate glass system
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Structural influence of PbO by means of FTIR and acoustics on calcium alumino-borosilicate glass system

机译：FTIR和声学对PbO的结构影响对钙铝硼硅酸盐玻璃体系的影响

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摘要

Glasses of the system xPbO-RNa2B4O7-(100 - R - x)CAS with 0 <= x <= 50, and 50 <= R <= 75 mol% have been synthesized in two compositional series and characterized by FTIR, and acoustics to explore the role of PbO on the structure of the glasses. The elastic properties of glasses have been investigated using sound velocity measurements at 4 MHz. According to the IR analysis, there is a depolymerization of the silicate network and a conversion of BO3 into BO4 structural units with the formation of non-bridging oxygens. PbO is incorporated into borosilicate network via B-O-Pb, and Si-O-Pb bonds. It is assumed that MO plays the role of a modifier by replacing the high strength B-O bond with a lower strength Pb-O bond which decreases the glass-transition temperature T-g. The increase of the density was attributed to the replacement of less dense borosilicate structural units by the more dense lead structural units. The observed compositional dependence of the ultrasonic velocity and the elastic moduli was interpreted in terms of the effect of PbO on the coordination of the borate structural units with oxygens and the depolymerization of the silicate network.
机译：xPbO-RNa2B4O7-（100-R-x）CAS系统的玻璃具有0 <= x <= 50和50 <= R <= 75 mol％的玻璃已按两个组成系列合成并通过FTIR和探索PbO在眼镜结构中的作用。使用4 MHz的声速测量研究了玻璃的弹性特性。根据IR分析，存在硅酸酯网络的解聚和BO 3转化为BO 4结构单元，并形成非桥连氧。 PbO通过B-O-Pb和Si-O-Pb键结合到硼硅酸盐网络中。假定MO通过用降低玻璃化转变温度T-g的较低强度的Pb-O键代替高强度的B-O键而起改性剂的作用。密度的增加归因于较高密度的铅结构单元取代了较低密度的硼硅酸盐结构单元。观察到的超声波速度和弹性模量的成分依赖性是根据PbO对硼酸盐结构单元与氧的配位作用和硅酸盐网络解聚的影响来解释的。

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