Temperature Characteristics of Raman Spectra in Nanometer Material Titanium Dioxide
WU Xijun1, ZHANG Ming-sheng, YIN Zhen2, JI Xiaoli3, CHEN Qiang
National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008;
1Department of Materials Science, Zhejiang University, Hangzhou 310027;
2Department of Physics, Nanjing University, Nanjing 210008;
3Department of Physics, University of Science and Technology of China, Hefei 230026
Temperature Characteristics of Raman Spectra in Nanometer Material Titanium Dioxide
National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008;
1Department of Materials Science, Zhejiang University, Hangzhou 310027;
2Department of Physics, Nanjing University, Nanjing 210008;
3Department of Physics, University of Science and Technology of China, Hefei 230026
Abstract： Raman spectra of the nanophase titanium dioxide were examined at various annealing temperatures. The temperature dependences of the Raman modes at 702, 612, 422, 230 -250, and 152cm-1 are discussed. The 702 cm-1 A2g mode belongs to first-order phonon connected to a critical nature of the selection rules with respect to the grain size. Lower anatase-rutile transition temperature 700°C is closely related to smaller grain size. The Eg mode at 422 cm-1 at room temperature shifts upward 24 cm-1 after successive annealing in air for one hour at 700°C, indicating the dependence of the lower mode frequency upon the larger oxygen deficiency.
1994, Vol. 11 
