通过DTA研究了TeO2-PbO-B2O3-Bi2O3-Li2O系统玻璃中TeO2、PbO物质的量比变化对玻璃转变温度(Tg)的影响,重点研究了n(TeO2)∶n(PbO)=2∶1条件下Li2O含量对玻璃转变温度的影响,并采用IR和XRD对玻璃的结构和析晶性进行了分析.结果表明:随着Li2O含量(2.7％～6.6％,摩尔分数)的增加,Tg呈N型变化趋势,当Li2O为2.7％(摩尔分数)时,Tg为最低值(300℃).碲系统玻璃中形成了[TeO]三角双锥体结构,它与[BO4]、BiO6]等多面体共同构成了玻璃的三维网络结构,该玻璃经热处理后易形成Bi2 TeO5晶体而会影响Tg.
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