利用29Si、11B、23Na MAS NMR，研究了一定组成的Na2O－B2O3－SiO2玻璃在不同温度下其微结构随分相处理时间的变化．结果表明，随分相过程的进行，[SiO4]结构单元的非桥氧之间逐渐脱氧，聚集程度逐渐提高，富硅相中的[BO3]结构与氧结合转变为[BO4]结构并进入富钠硼相，两相成分差逐渐增大，分相是扩散传质的结果．在较高的分相温度下，玻璃结构调整较快，因而更早地接近分相的平衡态．
29Si, 11B, 23Na MAS NMR were employed to study the structure change of the Na2O-B2O3-SiO2 glass in the process of
thermal treatment of phase separation. The results show that oxygen atoms are deleted among the [SiO4] structure units and the aggregation degree of Si
increases in the process of phase separation. In the meantime, the structure of boron atoms in silicon-rich phase is transformed gradually from [BO3] to
[BO4] and [BO4] units enter into sodium-boron rich phase. The difference between the compositions of the two phases gradually increases. The phase separation
is the result of diffusion and mass transfer. Moreover, the glass has a more rapid structure adjustment rate at a higher temperature of thermal treatment,
thus can get to the equilibrium state faster.
参考文献
| [1] | W. 福格尔著, 谢于琛译. 玻璃化学. 北京: 轻工业出版社, 1988. 159--160 2 干福熹主编. 现代玻璃科学技术(上册). 上海: 上海科学技术出版社, 1988. 88--92 3 李素文. [硕士学位论文]. 武汉: 武汉工业大学新材料研究所, 1996. 23--24 4 Eckert H. NMR Basic Principles and Progress, 1994, 33: 140--143 5 Van Wullen L, Muller-Warmth W. Solid State NMR. 1993, 2 (5): 279--284 |
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