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High pressure synthesis and electrical properties of BaTiO3−xFx

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−x F 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−x F 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.

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Endo, T., Kobayashi, T., Sato, T. et al. High pressure synthesis and electrical properties of BaTiO3−xFx . J Mater Sci 25, 619–623 (1990). https://doi.org/10.1007/BF00714085

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Keywords

  • TiO2
  • Solid Solution
  • Fluorine
  • Electrical Resistivity
  • BaTiO3