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

Author:
Han, Jiao, Lai, Yuanming, Xiang, Yao, Wu, Shuang, Zeng, Yiming, Yang, Hongwei, Mao, Yongyun, Yang, Yuwen
Source:
RSC advances 2017 v.7 no.24 pp. 14709-14715
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy, aluminum, aluminum oxide, boron compounds, calcium oxide, crystallization, differential scanning calorimetry, glass, nuclear magnetic resonance spectroscopy, silica, temperature
Abstract:
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.
Agid:
6361494