LAUSR

Abstract The devitrification behavior of glass depends on its network structure. High silica glass particles were prepared using a sol-gel method. The network structure modification was achieved by heat treatment at 1050 °C for 1 h after coating with 3 wt%∼ 5 wt% B2O3. The relationship between structure change and devitrification behavior of high silica glass particles with B2O3 modification was investigated by Raman, IR, 11B MAS NMR,29Si MAS NMR, and X-ray powder diffraction. The results demonstrated that the network structure units of high silica glass were comprised of BO (bridging oxygen), NBO (non-bridging oxygen, Q2 and Q3), [BO4], and [BO3]. It was found that Q2, Q3 and [BO3] could be converted into Q4 and [BO4] under the effect of B2O3modification. As the network structure of high silica glass was repaired by B2O3 modification, the devitrification behavior of high silica glass was prevented.