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Proton incorporation and defect chemistry of Yb-doped BaPrO3

Solid State Ionics
Publication Date
DOI: 10.1016/j.ssi.2007.02.006
  • Bapro3
  • Proton-Hole Mixed Conductor
  • Auto-Ionization
  • Defect Chemistry
  • Electrical Conductivity
  • Electronic Structure
  • Infra-Red Spectroscopy
  • Photoemission Spectroscopy
  • Chemistry


Abstract The defect chemical nature and electronic band structure of Yb-doped BaPrO 3 have been examined as a candidate for cathode materials in solid oxide fuel cell using oxide protonics material as a solid electrolyte, because of a possible presence of mixed conductivity of holes (electrons) and protons. The FT-IR results have shown that the proton concentration increases with the increase of dopant concentration. The electrical conductivity measurements suggest that p-type conductivity dominates in both intrinsic and extrinsic regions, showing a linear increase of conductivity with the increase of dopant concentration. The photoemission spectroscopy measurements have shown the presence of sub-band at the top of valence band, suggesting that the valence band is composed of O2p and Pr4f multiplet. These results can be explained by a simple defect chemical model assuming both auto-ionization of Pr 4+/Pr 3+ in the intrinsic region and the charge compensation for acceptor dopant of Yb 3+ on normal Pr 4+ site by holes in the extrinsic region.

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