Structure and crystallization behavior of Al containing glasses in the CaO–B₂O₃–SiO₂ system
2017
Han, Jiao | Lai, Yuanming | Xiang, Yao | Wu, Shuang | Zeng, Yiming | Yang, Hongwei | Mao, Yongyun | Yang, Yuwen
The aim of the present work is to investigate the effects of Al₂O₃ content on both the structure and crystallization behavior of CaO–B₂O₃–SiO₂ (CBS) glass composition using NMR, FT-IR and DSC. The density experimental results showed that the density (ρ) of glasses decreased linearly with increasing Al₂O₃ content, while the molar volume (Vₘ) of the glasses increased linearly. The NMR revealed that the Al occurred in the forms of Alᴵⱽ, Alⱽ and Alⱽᴵ units. With the increasing Al₂O₃ content, the amount of Al species show little change, the relative amount of Bᴵᴵᴵᵃ and Bᴵᴵᴵˢ units increases while the Bᴵⱽ units decrease, and the Q⁴ structural units increases clearly but the Q³ decreases. Further, crystallization peaks of CBS glasses shift to higher temperatures, indicating that Al₂O₃ addition can suppress crystallization of CBS glasses.
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