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

Publication: Research - peer-reviewConference article – Annual report year: 2003

View graph of relations

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
Publication date2003
Volume162
Journal numberSI
Pages93-98
ISSN0167-2738
DOIs
StatePublished

Conference

Conference11th International Conference on Solid State Protonic Conductors
CountryUnited Kingdom
CityGuildford
Period27/08/0230/08/02
CitationsWeb of Science® Times Cited: 7

Keywords

  • isotope effect, proton conductors, mixed conductivity, perovskite
Download as:
Download as PDF
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
PDF
Download as HTML
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
HTML
Download as Word
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
Word

ID: 6462908