Structural groups and their mixing in borosilicate glasses of various compositions – an NMR study

11B-MQMAS and 29Si–{11B} Double-Resonance NMR Studies on the Structure of Binary B2O3–SiO2 Glasses

“…u uller-Warmuth [3]. This is unambiguous evidence for the existence of a mixed borosilicate phase consisting of BO 3=2 and SiO 4=2 polyhedra.…”

“…Specifically for the glasses studied in the present work, binary borosilicate glasses, earlier models predict virtually complete phase separation. More recent studies by Stebbins et al [6], using 17 O MQMAS spectroscopy, and Martens et al [3] using 11 B MAS data, however, found considerable mixing of B 2 O 3 and SiO 2 .…”

“…The numerous studies using NMR techniques [3][4][5][6][7], IR [7,8] and Raman [9,10] approaches and most recently, theoretical modeling of glass structure [11][12][13], have led to a wealth of information about these glasses. Starting with the 11 B wideline NMR data, models were developed [2], which were then challenged by new experimental results with the onset of more sophisticated techniques, such as 29 Si MAS NMR, 17 O MAS and multiple quantum magic angle spinning NMR spectroscopy (MQMAS) NMR [3,6] and subsequently refined. The most prominent question with respect to glasses in this system is the degree of mixing between borate and silicate regions in the glasses, which was first assumed to be only very limited in agreement with the fact that the mixing of BO 3=2 and SiO 4=2 polyhedra is thermodynamically disfavored.…”

Experimentally determined dissolution kinetics of Na-rich borosilicate glass at far from equilibrium conditions: Implications for Transition State Theory

“…In contrast, the fraction of N 4 measured in the RD100 glass is slightly higher at a value of 0.93 (McGrail et al, 2001b). A plot of d 29 Si against N 4 for glass compositions in which molar Na > B (Martens and Mü ller-Warmuth, 2000) yields a strong correlation (Fig. 12).…”

Network structure and thermal stability study of high temperature seal glass

“…This result means that increasing 11 B chemical shift for the BO 4 sites causes less sharing of oxygen between BO 4 and SiO 4 tetrahedra from SABS-5 to SABS-35. 24 The bonding between BO 4 and SiO 4 is better than that between BO 3 and SiO 4 but keeps decreasing from SABS-5 to SABS-35.…”