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Kinetics of Oxygen Exchange in Sr(Ti0.65Fe0.35)O3

  • Th. Schneider (a1), S. F. Wagner (a1), W. Menesklou (a1) and E. Ivers-Tiffée (a1)

Abstract

Current limiting electrochemical pumping cells (amperometric sensors) based on zirconia are commonly used for engine control applications. Fast resistive-type sensors adapted from semiconducting metal oxides are a promising alternative for future exhaust gas monitoring systems. Therefore among the interesting characteristics of the materials system Sr(Ti0.65Fe0.35)O3, including high sensitivity and temperature independence at high oxygen partial pressures (pO2 > 10-4 bar), a short response time (t90 = 30 ms) is obviously the most salient.

The latter is determined by the kinetics of the oxygen surface transfer and subsequent diffusion of oxygen vacancies V O. For thin samples and low temperatures the surface transfer is dominant, since bulk diffusion usually occurs very fast. The presented model is based on the frequency-domain analysis of amplitude and phase shift of the response signal obtained from a pO2 modulation in a fast kinetic measurement setup. This method allows both the measurement of response times in the sub-millisecond range as well as the distinction of the behaviour either controlled by volume diffusion or by surface transfer reaction in Sr(Ti0.65Fe0.35)O3 ceramics.

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1. Ivers-Tiffée, E., Härdtl, K. H., Menesklou, W., Riegel, J., Electrochimica Acta 47, 807 (2001)
2. Moos, R., Härdtl, K.H., J. Am. Ceram. Soc. 80, 2549 (1997)
3. Menesklou, W., Schreiner, H.-J., Härdtl, K. H., Ivers-Tiffée, E., Sens. Actuators B 59, 184 (1999)
4. Steinsvik, S., Bugge, R., Gjønnes, J., Taftø, J., Norby, T., J. Phys. Chem. Solids 58, 969 (1997)
5. Menesklou, W., Schreiner, H.-J., Moos, R., Härdtl, K. H., Ivers-Tiffée, E., MRS Proc. Vol. 604, 305 (2000)
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Kinetics of Oxygen Exchange in Sr(Ti0.65Fe0.35)O3

  • Th. Schneider (a1), S. F. Wagner (a1), W. Menesklou (a1) and E. Ivers-Tiffée (a1)

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