Proton and oxide ion conductivity of doped LaScO3

The conductivity of La0.9Sr0.1Sc0.9Mg0.1O3 has been studied by impedance spectroscopy in controlled atmospheres. The material was found to be a mixed conductor with p-type conduction at high oxygen partial pressures and a combined proton and oxide ion conductor at low oxygen partial pressures. At te...

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Bibliographic Details
Published in:Solid state ionics 1999-10, Vol.125 (1-4), p.339-344
Main Authors: Lybye, Dorthe, Bonanos, Nikolaos
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Diffusion in solids
Exact sciences and technology
Ionic conductivity
Isotope effect
Perovskite oxide
Physics
Proton conduction
Self-diffusion and ionic conduction in nonmetals
Transport properties of condensed matter (nonelectronic)
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Summary:The conductivity of La0.9Sr0.1Sc0.9Mg0.1O3 has been studied by impedance spectroscopy in controlled atmospheres. The material was found to be a mixed conductor with p-type conduction at high oxygen partial pressures and a combined proton and oxide ion conductor at low oxygen partial pressures. At temperatures below 800°C and low partial pressure of oxygen, proton conduction was dominant. Above this temperature, the ionic conductivity is dominated by oxide ion transport. The protonic transport number was estimated from the conductivities measured in dry and in water-moisturised gas. An isotope effect was observed using D2/D2O in place of H2/H2O. The oxygen transport number was estimated from this effect and from measurements in a two-chamber electrochemical cell.
ISSN:0167-2738
1872-7689
DOI:10.1016/S0167-2738(99)00194-0