Electron Paramagnetic Resonance and Optical Absorption of Yellow Anatase TiO2 Single Crystal
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概要
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Electron paramagnetic resonance (EPR) measurements revealed the inclusion of nitrogen in yellow anatase single crystals grown by chemical vapor transport using NH4Cl as the transport agent. The angular-dependence of EPR triplets suggests that nitrogen occupies a substitutional site of oxygen in the bulk. The paramagnetic nitrogen observed at room temperature becomes diamagnetic at lower temperatures by trapping another electron. Below 50 K, only one symmetric differential EPR signal from titanium with an unpaired electron can be observed. These changes in the electric states of nitrogen and titanium can be explained by the presence of oxygen vacancies and by the contribution of trapped electrons to oxygen vacancies. The optical absorption observed at 3.0 eV in an $\mathbf{E}\parallel\mathbf{a}$ configuration, which is characteristic of yellow anatase is almost independent of temperature.
- 2009-11-15
著者
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KODAIRA Tetsuya
National Institute of Materials and Chemical Research
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Sekiya Takao
Department Of Obstetrics And Gynecology Fujita Health University
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Kurita Susumu
Department Of Materials Engineering Yokohama National University
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Sekiya Takao
Department of Physics, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501
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Kamiya Nozomi
Department of Physics, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501
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Ohya Shohei
Department of Physics, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501
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Kurita Susumu
Department of Physics, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501
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Kodaira Tetsuya
National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565
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