通过高分辨透射电镜法,差示扫描量热法和x射线衍射法分析了二氧化钛凝胶向锐钛矿转变的相变过程.结果发现,三种方法测试的相变行为并不完全一致.透射电镜分析结果表明,在100℃干燥24 h的非晶态凝胶中存在少量的结晶不完全的锐钛矿相;然而x射线衍射法并未检测出晶体.随着烧结温度的升高,锐钛矿的晶格常数c逐渐降低,当温度达到300℃以后接近标准值(如,JCPDS卡片号84-1285).而晶格常数a则保持了相对稳定并且透射电镜法和x射线衍射法计算出的结果基本一致.另外,透射电镜法分析的锐钛矿的晶粒度大于x射线衍射法检测出的晶粒度.
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