The structural and electric properties of the perovskite system BaTiO 3-Ba(Fe1/2Ta1/2)O3

Guobao Li, Shixiang Liu, Fuhui Liao, Shujian Tian, Xiping Jing, Jianhua Lin, Yoshiaki Uesu, Kay Kohn, K. Saitoh, Masami Terauchi, Naili Di, Zhaohua Cheng

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55 Citations (Scopus)

Abstract

Compounds in the pseudo-binary BaTiO3-Ba(Fe1/2Ta 1/2)O3 system have been synthesized at 1500°C in air and characterized by X-ray and electron diffraction as well as impedance analysis and Mössbauer spectroscopy. The symmetry of Ba(Fe 1/2Ta1/2)O3 is found to be trigonal with the space group P3m1. Two solid solutions exist in the BaTi1-xFe x/1Tax/1O3 system at room temperature. The first (SS1) is in the composition range 0≤x≤0.07 and is tetragonal, P4mm, while the second broader solid solution, (SS2) 0.12≤x≤1, is trigonal and has the space group P3m1. The conductivity becomes higher with reduced amount of Ti in the structure. The activation energy of conductivity differs between the two solid solutions, 0.80eV for SS1 and 0.30eV for SS2, which indicates different mechanisms. The maximum of the real part of the permittivity recorded for compounds in SS1 decreases towards room temperature with increasing amount of Fe/Ta doping and a high dielectric constant of around 7000 is found for BaTi0.94Fe0.03Ta0.03O3.

Original languageEnglish
Pages (from-to)1695-1703
Number of pages9
JournalJournal of Solid State Chemistry
Volume177
Issue number4-5
DOIs
Publication statusPublished - 2004 Apr 1

Keywords

  • Barium iron tantalum oxide
  • Conductivity and dielectric property
  • Perovskite
  • Relaxor
  • Space group P3m1
  • Structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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    Li, G., Liu, S., Liao, F., Tian, S., Jing, X., Lin, J., Uesu, Y., Kohn, K., Saitoh, K., Terauchi, M., Di, N., & Cheng, Z. (2004). The structural and electric properties of the perovskite system BaTiO 3-Ba(Fe1/2Ta1/2)O3. Journal of Solid State Chemistry, 177(4-5), 1695-1703. https://doi.org/10.1016/j.jssc.2003.12.025