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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
Article

Abstract

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.

Keywords

TiO2 Solid Solution Fluorine Electrical Resistivity BaTiO3 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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