物理化学学报 >> 1997, Vol. 13 >> Issue (06): 525-531.doi: 10.3866/PKU.WHXB19970609

研究论文 上一篇    下一篇

钠硼硅酸盐玻璃分相及浸析的NMR研究

任海兰,岳勇,叶朝辉,谭国华,袁启华   

  1. 中国科学院武汉物理研究所，波普与原子分子物理国家重点实验室，武汉 430071|武汉工业大学新材料研究所，武汉 430070
  • 收稿日期:1996-10-07 修回日期:1997-01-13 发布日期:1997-06-15
  • 通讯作者: 岳勇

Phase Separation and Acid Etching of Sodium Borosilicate Glasses Studied by NMr

Ren Hai-Lan,Yue Yong,Ye Chao-Hui,Tan Guo-Hua,Yuan qi-Hua   

  1. Laboratory of Nuclear Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics,Academia simica,Wuhan 430071|Advanced Materials Institute,Wuhan University of Technology,Wuhan 430070
  • Received:1996-10-07 Revised:1997-01-13 Published:1997-06-15
  • Contact: Yue Yong

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摘要：

用多种NMR方法，包括(29)Si、(23)Na、(11)B MAS及(29)Si CP／MAS NMR，研究了一定组成的Na2O－B2O3-SiO2三元体系玻璃在不同温度下分相处理24小时及用酸侵析处理后的结构变化. 结果表明，在低于分相上限临界温度的范围内，存在着一个温度转折点. 低于这一温度时，受动力学因素影响，分相未达平衡态，温度愈低，距平衡态愈远，分相愈不完全. 超过这一温度，分相可达平衡态，受热力学控制，温度愈高，混溶程度愈大. 故在此温度点分相处理，可达最佳分相效果. 不同核所得的NMR结果之间有良好的对应关系.

关键词: 钠硼硅酸盐, 分相, 浸析, NMR

Abstract:

Multinuclear solid-state NMR, including (29)Si、(23)Na、(11)B MAS and （29）Si CP/MAS NMR was employed to study the structure change of Na2O-B2O3-SiO2 glasses after 24 hour heat-treatment of phase separation at different temperatures. Then the glasses were etched with acid. The results show that there is a turning point temperature. Being confined by dynamical factors, phase separation did not reach equilibrium below this temperature. The degree of phase separation was reduced when the temperature was decreased. When the temperature was above this turning temperature, the phase separation could reach equilibrium. Being controlled by thermodynamics, the degree of mtiscibility was enhanced when the temperature was increased. The phase separation was the best when the heat-treatment of phase separation was proceeded at this turning temperature. The NMR results obtained from different resonant nuclei were consistent with one another.

Key words: Sodium borosilicate, Phase separation, Etching, NMR