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Structure and crystallization behavior of Al containing glasses in the CaO–B₂O₃–SiO₂ system

Han, Jiao, Lai, Yuanming, Xiang, Yao, Wu, Shuang, Zeng, Yiming, Yang, Hongwei, Mao, Yongyun, Yang, Yuwen
RSC advances 2017 v.7 no.24 pp. 14709-14715
Fourier transform infrared spectroscopy, aluminum, aluminum oxide, boron compounds, calcium oxide, crystallization, differential scanning calorimetry, glass, nuclear magnetic resonance spectroscopy, silica, temperature
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.