摘要
在Sm2O3掺杂BaOB2O3Al2O3SiO2Sm2O3(BBASS)玻璃系统的形成性能研究的基础上,借助MASNMR以及差热测试(DTA)技术,研究了玻璃的结构特点以及玻璃组成、热处理条件等因素对玻璃结构的影响.研究表明,在未掺稀土的BBAS玻璃结构中,硼氧多面体主要以[BO3]、[BO4]存在,铝氧多面体主要以[AlO4]、[AlO5]、[AlO6]存在;随着BBAS中BaO含量的增加,硼氧三角体[BO3]逐渐向[BO4]转变,原先[AlO4]、[AlO5]、[AlO6]共存的铝氧多面体结构逐渐转变为大量[AlO4]和少量[AlO5]共存的结构;稀土Sm3+具有较强的积聚作用,其能促使玻璃结构中的硼氧多面体形成巨大的网络结构;热处理对玻璃结构中硼氧多面体和铝氧多面体的配位结构影响不大.
Forming performances of Sm2O3 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 ]. Sm^3＋ 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.
出处
《波谱学杂志》
CAS
CSCD
北大核心
2005年第3期261-267,共7页
Chinese Journal of Magnetic Resonance
基金
江苏省自然科学基金资助项目(BT2004121)
江苏省高校自然科学基金项目资助(03kjb430046)
教育部跨世纪优秀人才资助项目.
关键词
NMR
稀土
玻璃形成
玻璃结构
NMR, rare earth, glass forming, glass structure, magic angle spinning
