Journal cover Journal topic
Journal of Sensors and Sensor Systems An open-access peer-reviewed journal
J. Sens. Sens. Syst., 6, 107-119, 2017
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Regular research article
28 Feb 2017
Oxygen transport in epitaxial SrTiO3/SrTi1 − xFexO3 multilayer stacks
Michal Schulz1, Timna Orland2, Alexander Mehlmann2, Avner Rothschild2, and Holger Fritze1 1Institute of Energy Research and Physical Technologies, Clausthal University of Technology, Goslar, Germany
2Department of Materials Science and Engineering, Technion, Israel Institute of Technology, Haifa, Israel
Abstract. Nano-ionic materials made of strontium titanate (SrTiO3, STO) and solid solutions of strontium ferrite in STO (SrTi1 − xFexO3, STF) are grown on single crystalline STO substrates and characterized. Since STF exhibits an oxygen deficiency and, simultaneously, enables oxygen interstitial defects, a space charge area close to the STO | STF interface is present. Oxygen tracer diffusion experiments and impedance spectroscopy at temperatures from 500 to 700 °C and at oxygen partial pressure ranging from 10−3 to 10−23 bar confirm fast oxygen transport caused by enhanced ionic conductivity at the interface. There, an oxygen diffusion coefficient of 3. 4 × 10−10 m2 s−1 at 600 °C and a p type conductivity of about 360 S m−1 at 700 °C are calculated. Such structures open new options in design of nano-ionic materials for oxygen sensors and energy conversion at temperatures lower than those of conventional materials such as yttrium-doped zirconia.

Citation: Schulz, M., Orland, T., Mehlmann, A., Rothschild, A., and Fritze, H.: Oxygen transport in epitaxial SrTiO3/SrTi1 − xFexO3 multilayer stacks, J. Sens. Sens. Syst., 6, 107-119, doi:10.5194/jsss-6-107-2017, 2017.
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