Rare Earth Doped Boroaluminosilicate Glass Studied by Magic Angle Spinning Solid State NMR Spectroscopy

Abstract

Abstract:

Forming performances of Sm\-2O\-3 doped BaO-B₂O₃-Al₂O₃-SiO₂-Sm₂O₃ (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 [BO₃] and [BO₄] and the aluminum coordination were mainly[AlO₄], [AlO₅] and [AlO₆]. It was found that, with the increase of BaO content in the BBAS glass, [BO₃] gradually became [BO₄], and [AlO₅]/[AlO₆] gradually changed to [AlO₄]. Sm³⁺ could accumulate in the glass with large amount, facilitating [BO₄] 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.

Key words: NMR, rare earth, glass forming, glass structure, magic angle spinning

CLC Number:

TQ171

LU Chun-Hua, NI YA-Ru, HU Zhong-Zi. Rare Earth Doped Boroaluminosilicate Glass Studied by Magic Angle Spinning Solid State NMR Spectroscopy[J]. Chinese Journal of Magnetic Resonance, 2005, 22(3): 261-267.

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