Abstract
Thin films La0.9Sr0.1Ga0.85Mg0.15O2.875 (LSGMO), an oxide ion conducting electrolyte material, which has potential application in oxygen sensor development and in solid oxide fuel cells, have been prepared by pulsed-laser deposition. Preparation of thin film under high-vacuum condition gives a stoichiometric LSGMO, whereas film prepared under oxygen atmosphere is not stoichiometric. Highly oriented films of LSGMO are obtained on SrTiO3 {STO(001)}, whereas polycrystalline films are obtained on sapphire(0001), quartz, and calcia-stabilized zirconia substrates. Film conductivity is measured by ac impedance analysis. Film on sapphire shows higher conductivity compared to that of the film on STO by a factor of 10 at 730 °C. The activation energies for films on sapphire and STO are 0.7 and 0.82 eV, respectively, in the temperature region between 630 and 930 °C.
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