Chapter 9. Physical Properties in the Bi2O3-Fe2O3 System Containing Y2O3 and CaO Dopants

  1. Narottam P. Bansal,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. Hsin-Chai Huang,
  2. Yu-Chen Chang and
  3. Tzer-Shin Sheu

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291337.ch9

Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4

Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4

How to Cite

Huang, H.-C., Chang, Y.-C. and Sheu, T.-S. (2006) Physical Properties in the Bi2O3-Fe2O3 System Containing Y2O3 and CaO Dopants, in Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4 (eds N. P. Bansal, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291337.ch9

Author Information

  1. Department of Materials Science and Engineering I-Shou University Kaohsiung, Taiwan

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080542

Online ISBN: 9780470291337

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Keywords:

  • temperature;
  • perovskite;
  • microscope;
  • dilatometric;
  • x-ray

Summary

Dopants Y2O3 and CaO were added into the Bi2O3-Fe2O3 system to observe the formation of perovskite structure, BiFeO3, so-called 113 phase. The content of Y2O3 or CaO dopant was up to 10∼13 mol%. The perovskite sturature was likely to form in the Fe2O3-rich composition region, but not in the Bi2O3-rich composition region. At high sintering temperatures, T=850°C, γ-Bi2O3 appeared in the Bi2O3-Fe2O3-Y2O3 system, but not in the Bi2O3-Fe2O3-CaO system.

From an electrical conductivity measurement, a sintered sample with the composition of Bi0.4675Fe0.45Ca0.0825O1.5 had a higher ionic conductivity up to 1 × 10−1 S/cm at 700°C. Most solid electrolytes had an activation energy of 0.5eV for a charge carrier at 30∼400°C, but a much lower activation energy at 400∼700°C. The electrical conduction mechanisms were further studied.