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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
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| Cite this article: |
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WU Xijun, ZHANG Ming-sheng, YIN Zhen et al 1994 Chin. Phys. Lett. 11 685-688 |
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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.
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| Keywords:
65.90.+i
78.30.Hv
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Published: 01 November 1994
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| PACS: |
65.90.+i
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(Other topics in thermal properties of condensed matter)
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78.30.Hv
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(Other nonmetallic inorganics)
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