Journal of Materials Science

, Volume 25, Issue 1, pp 619–623 | Cite as

High pressure synthesis and electrical properties of BaTiO3−xFx

  • Tadashi Endo
  • Tetsuro Kobayashi
  • Tsugio Sato
  • Masahiko Shimada


The substitution of fluorine for oxygen in BaTiO3 was investigated by the reaction of BaO2, BaF2, TiO2 and Ti under the conditions of 3.0 GPa and 1300° C for 2 H. Batio3−xF x solid solutions were obtained as a single phase in the region of 0 ⩽x⩽0.1. The X-ray diffraction data showed that the symmetrical change from tetragonal to cubic form occurred atx=0.08 at room temperature. Also, the solid solutions were characterized by TG-DTA analysis, ESCA spectroscopy and diffusion reflectance spectroscopy. As a result, the existence of Ti3+ was verified. The electrical resistivities of BaTiO3−xF x were in the range from 4Ωcm for x=0.05 to 3OΩcm forx=0.1 at 300 K and the relationship between Inϱ and 1000 T−1 was linear. The thermoelectric powers at 300 K were −250μV K−1 forx=0.05 and −130μVK−1 forx=0.1. The electrical property of the solid solution was discussed on the basis of a conventional band model which involved localized donor levels associated with oxygen vacancies.


TiO2 Solid Solution Fluorine Electrical Resistivity BaTiO3 
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Copyright information

© Chapman and Hall Ltd. 1990

Authors and Affiliations

  • Tadashi Endo
    • 1
  • Tetsuro Kobayashi
    • 1
  • Tsugio Sato
    • 1
  • Masahiko Shimada
    • 1
  1. 1.Department of Molecular Chemistry and Engineering, Faculty of EngineeringTohoku UniversitySendaiJapan

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