The influence of the technological parameters on the ionic conductivity of samarium doped ceria thin films
Keywords:samarium doped cerium oxide (SDC), electron beam deposition, solid oxide fuel cells (SOFC), thin films, ionic conductivity
Sm0,20Ce0,80O2 powder was used for the formation of samarium doped cerium oxide (SDC) thin films using e-beam. Surface area of powder was 34.9 m2/g and particle size – 0.3-0.5 μm. Thin films were deposited using physical vapor deposition system on SiO2 and Alloy 600 substrates. 2 Å/s – 16 Å/s growth rate and 20 °C – 600 °C substrate temperature were used during the deposition. Ionic conductivity investigation revealed that the maximum ionic conductivity (1.67 S/m) has the thin film deposited on 300 °C temperature substrate using 4 Å/s growth rate. Minimum ionic conductivity (0.26 S/m) has thin film which was deposited on 20 °C temperature substrate using 8 Å/s growth rate. Vacancy activation energies vary in 0.87 eV – 0.97 eV range. Furthermore the calculations of crystallite size revealed that crystallite size increases with increasing substrate temperature: from 7.50 nm to 46.23 nm on SiO2 substrate and from 9.30 nm to 44.62 nm on Alloy 600 substrate. Molar concentration of samarium in initial evaporated material is 19.38 mol% and varies from 11.37 mol% to 21 mol% in formed thin films depending on technological parameters.
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