The preparation and electrical properties of tio2- x fx

Tadashi Endo, Naoki Morita, Tsugio Sato, Masahiko Shimada

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    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 languageEnglish
    Pages (from-to)392-397
    Number of pages6
    JournalJournal of Materials Research
    Volume3
    Issue number2
    DOIs
    Publication statusPublished - 1988 Apr

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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