文献类型：期刊文献

英文题名：Unique Sodium Phosphosilicate Glasses Designed Through Extended Topological Constraint Theory

作者：Zeng, Huidan[1];Jiang, Qi[1];Liu, Zhao[1];Li, Xiang[1];Ren, Jing[1];Chen, Guorong[1];Liu, Fude[2];Peng, Shou[3]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China;[2]Univ Hong Kong, Dept Mech Engn, Hong Kong, Hong Kong, Peoples R China;[3]China Triumph Int Engn Co Ltd, Shanghai 200063, Peoples R China

年份：2014

卷号：118

期号：19

起止页码：5177

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY B

收录：;EI(收录号：20142117748606);WOS:【SCI-EXPANDED(收录号:WOS:000336199100021)】；

基金：This work was supported by the Natural Science Foundation of Shanghai (12ZR1407600), the Fundamental Research Funds for the Central Universities, the Shanghai Leading Academic Discipline Project (B502). We would like to thank Dr. Jiacheng Li (The Shanghai Institute of Ceramics, Chinese Academy of Sciences) and Guangjun Zhang (Schott Glass Technology (Suzhou) Co., Ltd) for stimulating discussion about glass structure.

语种：英文

外文关键词：Hardness - Fuel cells - Optical fibers - Temperature - Silica - Sodium compounds - Glass transition - Topology

摘要：Sodium phosphosilicate glasses exhibit unique properties with mixed network formers, and have various potential applications. However, proper understanding on the network structures and property-oriented methodology based on compositional changes are lacking. In this study, we have developed an extended topological constraint theory and applied it successfully to analyze the composition dependence of glass transition temperature (T-g) and hardness of sodium phosphosilicate glasses. It was found that the hardness and T-g of glasses do not always increase with the content of SiO2, and there exist maximum hardness and T-g at a certain content of SiO2. In particular, a unique glass (20Na(2)O-17SiO(2)-63P(2)O(5)) exhibits a low glass transition temperature (589 K) but still has relatively high hardness (4.42 GPa) mainly due to the high fraction of highly coordinated network former Si-(6). Because of its convenient forming and manufacturing, such kind of phosphosilicate glasses has a lot of valuable applications in optical fibers, optical amplifiers, biomaterials, and fuel cells. Also, such methodology can be applied to other types of phosphosilicate glasses with similar structures.