【摘要】 采用溶胶-凝胶法在不同温度下煅烧制备了系列TiO₂纳米粉末,并系统研究了煅烧温度对TiO₂晶型转变的促进作用。结果表明,煅烧温度对TiO₂纳米粉末的晶体结构具有显著影响。当煅烧温度从300oC依次递增到600oC时,所制备的TiO₂纳米粉末呈现出良好的单相锐钛矿结构,且锐钛矿相的结晶度随煅烧温度增加而逐渐增强。但是当煅烧温度继续增加时,TiO₂纳米粉末的微观结构由单相锐钛矿结构逐渐向金红石结构及板钛矿结构转变。当煅烧温度为700oC时,TiO₂体系的晶型为锐钛矿相与金红石相共存;当煅烧温度为800oC时,锐钛矿相急剧下降,板钛矿相开始出现,TiO₂体系的晶型表现为锐钛矿相、金红石相及板钛矿相三相共存。研究结果表明,600oC为制备结晶度最优单相锐钛矿结构TiO₂的最佳煅烧温度。更多还原

【Abstract】 TiO₂ nanoparticles were prepared by sol-gel technology coupled with calcining the samples at different temperature, and the effect of calcination temperature on the crystal transition of TiO₂ was investigated in detail. The revealed results indicate that, the crystal transition of TiO₂ is drastically influenced by calcination temperature. When calcined at low temperature（from 300 oC to 600 oC）, the structure of the samples exhibits singleanatase phase, and the crystallization degree of the tetragonal anatase structureis gradually strengthened with the increase of calcination temperature. However, the rutile phase was triggered when the calcination temperature increased to 700 oC, and rutile phasecoexist with the anatasein the structure of the samples. With the further increase of calcination temperature to 800 oC,the crystallization degree of the tetragonal anatase structure drasticallydeclined and brookite phase started to appear. The results reveal that 600 oC is the optimalcalcination temperature to prepare high crystallization degree of singleanatase phase TiO₂ in a view point of practical importance.更多还原