非晶态离子导体Li2B2O4的核磁共振研究

本文报道了非晶态离子导体Li₂B₂O₄的⁷Li核磁共振研究。测量了⁷Li核磁共振谱与温度的关系。实验中发现,Li₂B₂O₄的晶态、非晶态和部分晶化样品的⁷Li核磁共振谱有很大的不同,且在部分晶化样品的⁷Li核磁共振谱上有附加的小峰,它与LiCl(Al₂O₃)的⁷Li核磁共振谱上附加的小峰相类似。我们也对非晶态离子导体B₂O₃-0.7Li₂O-0.7LiCl进行了⁷Li核磁共振研究,其结果与上面的类似。研究结果表明,它们都起因于非晶母体与微晶的界面效应。 关键词：

7Li NMR INVESTIGATIONS IN AMORPHOUS IONIC CONDUC-TOR Li2B2O4

In order to understand the mechanism of the ionic conductivity enhancement during pre-crystallization process, we have performed ⁷Li NMR investigations on amorphous ionic conductor Li₂B₂O₄. The temperature dependence of ⁷Li NMR spectra is studied. It is found that ⁷Li NMR spectra in crystalline, amorphous samples and amorphous sample with small amounts of crystallites are very different from each other. An additional peak is observed to overlap ⁷Li NMR absorption line on amorphous sample with small amounts of crystallites. This phenomenon is similar to that in LiCl (or LiI) containing dispersed secondphase particles. ⁷Li NMR investigations on amorphous ionic conductor B₂O₃-0.7Li₂O-0.7LiCl is also made, the results are similar to that mentioned above. It is concluded that they are all caused by the interfacial effect between amorphous matrix and the crystallites.