Fabrication and electrical characterisation of strontium and titanium-doped lanthanum scandate

C. Hatchwell, N. Bonanos, Mogens Bjerg Mogensen

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    The perovskite La0.7Sr0.3Sc0.8Ti0.2O2.95 has been prepared and its transport properties studied over the temperature range 170–1000 °C in varied oxygen partial pressures. The electrical conductivity was measured by impedance spectroscopy and the four-point dc technique in atmospheres of N2/H2/H2O or N2/O2/H2O; further measurements in N2/D2/D2O or N2/O2/D2O were used to observe the conductivity isotope effect. The faradaic transport of oxygen was measured in a two-compartment cell in an atmosphere of N2/H2/H2O. La0.7Sr0.3Sc0.8Ti0.2O2.95 in reducing atmospheres is found to exhibit both protonic and oxide ion conductivity, while at high oxygen partial pressures, p-type conductivity is observed. The total conductivity at 800 °C in air with ∼1% H2O was 14 mS cm−1. At the same temperature, the observed H/D isotope effect indicates a protonic transport number of between 0.3 to 0.4, while the measurements on the faradaic transport cell gave a value of 0.5.
    Original languageEnglish
    JournalSolid State Ionics
    Volume162
    Issue numberSI
    Pages (from-to)93-98
    ISSN0167-2738
    DOIs
    Publication statusPublished - 2003
    Event11th International Conference on Solid State Protonic Conductors - Guildford, United Kingdom
    Duration: 27 Aug 200230 Aug 2002

    Conference

    Conference11th International Conference on Solid State Protonic Conductors
    CountryUnited Kingdom
    CityGuildford
    Period27/08/200230/08/2002

    Keywords

    • isotope effect
    • proton conductors
    • mixed conductivity
    • perovskite

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