配合料MgO-ZnO-Li2O-Al2O3-SiO2于1 550℃熔融2 h,经两步及三步热处理工艺控制成核及晶体生长.采用DTA、XRD、SEM、FT-IR和紫外-可见-近红外分光光度计对材料进行表征.六面体填隙β-锂霞石固溶体于840～960 ℃析出,960℃开始发生晶型转变,1 100 ℃下β-锂霞石固溶体转变为四面体β-黝辉石固溶体.根据XRD结果计算出六方β-锂霞石晶体的晶格参数为α(0.514 5±0.000 6)nm,c(0.547 5±0.000 4)nm,四面体β-黝辉石晶体的晶格参数为α(0.748 36±0.000 3)nm,c(0.905 85±0.000 7)nm.几乎全部铝原子进入β-锂霞石六配位体中,而只有少量的六配位铝原子存在于残余玻璃相中.所有铝原子未进入到β-黝辉石四面体结构,在残余玻璃相中多以六配位形式存在.粒径为15 nm左右的β-锂霞石玻璃陶瓷在可见光波长范围内透过率达85%.
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