Abstract
The substitution of fluorine for oxygen in TiO2 was investigated by the reaction of Ti2O3, TiO2, and TiF3 under conditions of 4-6.5 GPa and 700–1400 °C. The single phase of TiO2-x Fx solid solution was obtained in the region of 0≤x≤0.7. According to the x-ray diffraction data, the a and c axes of the rutile-type structure linearly increased with increasing fluorine content. The electrical resistivities of TiO2-x FX were in the range from 10 Ω cm for x=0.3 to 850 Ωcm for x = 0.7 at 300 K and the relationship between In p and 1000/T was linear. The activation energies were estimated to be from 0.17eV at x = 0.3 to 0.28 eV at x = 0.7. Also, the thermoelectric powers at room temperature changed from — 250 μV/K to + 50μV/K. The mechanism of electric conduction was discussed on the basis of the extended band model of rutile.
Original language | English |
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Pages (from-to) | 392-397 |
Number of pages | 6 |
Journal | Journal of Materials Research |
Volume | 3 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1988 Apr |
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering