Rare Earth Doped Boroaluminosilicate Glass Studied by Magic Angle Spinning Solid State NMR Spectroscopy
稀土掺杂硼铝硅酸盐玻璃结构的NMR研究

Forming performances of Sm-2O-3 doped BaO-B-2O-3-Al-2O-3-SiO-2-Sm-2O-3 (BBASS) glass systems have been assessed in previous studies. In this study, magic angle spinning (MAS) NMR spectroscopy and differential thermal analysis (DTA) test were employed to characterize glass structure and to study the factors affecting glass structure, such as glass composition and conditions for heat-treatment, in such glass systems. In BBAS glass without rare earth doping, the boron coordination were mainly BO-3] and BO-4] and the aluminum coordination were mainlyAlO_4], AlO_5] and AlO_6]. It was found that, with the increase of BaO content in the BBAS glass, BO-3] gradually became BO-4], and AlO-5]/AlO-6] gradually changed to AlO-4]. Sm+{3+} could accumulate in the glass with large amount, facilitating BO-4] to form a large network. It was also found that heat-treatment had little or no effect on the boron and aluminum coordination in the glass structure.