【摘要】 以纳米TiO₂为原料,通过煅烧反应制备了纳米K₂Ti₆O₁₃晶须,对晶须合成中温度和时间诱导的相变、形态演化和生长机理等进行了原位研究．结果表明：纳米TiO₂作原料可显著降低晶须合成温度,适宜的煅烧温度为900～1100℃．形态演化观察和高温XRD分析表明：K₂Ti₆O₁₃晶须的相变及生长对温度极为敏感,形态演化是基于初期爆发式的相变和随后串并联式的长大．K₂Ti₆O₁₃晶须的生长遵守本研究提出的串并联机制,晶须轴向的生长台阶是串并联生长的直接结果．更多还原

【Abstract】 The present work was aimed at in situ studies of temperature and time induced phase transition,morphologic evolution,growth mechanism,and microstructure of K₂Ti₆O₁₃ nano- whiskers synthesized by calcination reaction using nanometer TiO₂ as the starting material.The experimental results indicate that the use of nanometer TiO₂ greatly reduces calcination temper- ature with a suitable calcination temperature range of 900～1100℃.Observation of morphologic evolution and dynamic HTXRD analysis show that the phase transition and growth of K₂Ti₆0₁₃ whiskers are quite sensitive to calcination temperature,and the morphologic evolution of K₂Ti₆0₁₃ whiskers is mainly based on the fulminous phase transition at the initial stage and subsequent concatenation-parallel growth in length and diameter.The growth of K₂Ti₆O₁₃ whiskers follows the concatenation-parallel growth mechansim developed in this study,which directly results in the formation of growth steps along the axis of the whiskers.更多还原