| Structure transition of nano-titania during calcination |
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| 作者姓名： | 李国华 王大伟 徐铸德 陈卫祥 |
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| 作者单位： | Department of Chemistry，School of Geology and Environment Engineering，Department of Chemistry，Department of Chemistry Zhejiang University，Hangzhou 310027，China，Central South University，Changsha 410083，China，Zhejiang University，Hangzhou 310027，China，Zhejiang University，Hangzhou 310027，China |
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| 基金项目： | Project( 201710 39) supportedbytheNationalNaturalScienceFoundationofChinaandproject(0 1JJY2116)supportedbytheNaturalScienceFoundationofHunanProvince |
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| 摘 要： | 1 INTRODUCTIONTitaniahasthreecrystallines :brookite ,anataseandrutile .TheirbasicstructuralunitisthesameTiO6 ]octahedron ,buttheirlatticestructuresaredifferent .Forexample ,brookitebelongstorhombiccrystallo series ,whilerutileandanatasebelongtosquarecrystallo series .Thoughrutileandanatasearethesamecrystallo series ,theirsymmetricalelementsandunit cellparametersaredifferent1] .Inrecentyears ,muchattentionhasbeenpaidtophasetransformationoftitaniaparticle ,especiallytothetemperatureofph…
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| 收稿时间： | 16 March 2003 |
| 修稿时间： | 9 July 2003 |
Structure transition of nano-titania during calcination |
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| LI Guo-hua.Structure transition of nano-titania during calcination[J].Journal of Central South University of Technology,2003,10(4):275-279. |
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| Authors: | LI Guo-hua |
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| Affiliation: | (1) Department of Chemistry, Zhejiang University, 310027 Hangzhou, China;(2) School of Geology and Environment Engineering, Central South University, 410083 Changsha, China |
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| Abstract: | In order to study the structure transition during calcination, nano-titania powders prepared by hydrolyzing precipitation
approach and calcined at 300, 400, 500, 600 and 700 °C were characterized by XRD, TEM and electron diffraction (ED), respectively.
The results show that titania powders calcined below 500 °C are almost composed of anatase, rutile appears below 500 °C and
its ratio increases gradually with increase of calcin temperature; nano-titania particles are smaller than 40 nm mostly and
the dispersion is related to calcining temperature; the interplanar distances of nano-anatase single crystalline change gradually
when calcing temperature increases to 500 °C; so do that of nano-rutile single crystalline when calcining temperature charges
from 600 to 700 °C. The conclusions can be drawn that the temperature of transformation from anatase to rutile is below 500
°C and the process carries on gradually. Both inter-planar distances and the structure of nano-titania transform gradually
with increasing calcing temperature.
Foundation item: Project (20171039) supported by the National Natural Science Foundation of China and project (01JJY2116) supported by the
Natural Science Foundation of Hunan Province |
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| Keywords: | nano-titania phase transformation structure transition inter-planar distances |
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