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Electrical Conductivity of the High‐Temperature Proton Conductor BaZr 0.9 Y 0.1 O 2.95
Author(s) -
Bohn Hans G.,
Schober Tilman
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01272.x
Subject(s) - proton conductor , conductivity , perovskite (structure) , proton , analytical chemistry (journal) , activation energy , grain boundary , thermal conduction , electrical resistivity and conductivity , oxygen , materials science , chemistry , inorganic chemistry , crystallography , electrolyte , microstructure , physics , organic chemistry , electrode , quantum mechanics , chromatography , engineering , electrical engineering , composite material
The impedance of the cubic perovskite BaZr 0.9 Y 0.1 O 3‐δ has been systematically investigated in dry and wet atmospheres at high and low oxygen partial pressures. In the grain interior, conductivity contributions from oxygen ions, electron holes, and protons can be identified. Below 300°C, proton conduction dominates and increases linearly with the frozen‐in proton concentration. The proton mobility, with an activation energy of 0.44 ± 0.01 eV is among the highest ever reported for a perovskite‐type oxide proton conductor. For dry oxygen atmos‐pheres, electron hole conduction dominates with an activation energy of ∼0.9 eV. At temperatures <500°C, the grain‐boundary conductivity can be separated and increases upon incorporation of protons. The high electrical conductivity and chemical stability make acceptor‐doped barium zirconate a good choice for application as a high‐temperature proton conductor.