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Sr(Ti, Fe)O3-δ Exhaust Gas Sensors

Published online by Cambridge University Press:  01 February 2011

Thomas Schneider ,
Christoph Peters ,
Stefan Wagner ,
Wolfgang Menesklou  and
Ellen Ivers-Tiffée
Thomas Schneider
Affiliation:
Institut für Werkstoffe der Elektrotechnik IWE, Universität Karlsruhe (TH), Adenauerring 20b, 76131 Karlsruhe, Germany
Christoph Peters
Affiliation:
Institut für Werkstoffe der Elektrotechnik IWE, Universität Karlsruhe (TH), Adenauerring 20b, 76131 Karlsruhe, Germany
Stefan Wagner
Affiliation:
Institut für Werkstoffe der Elektrotechnik IWE, Universität Karlsruhe (TH), Adenauerring 20b, 76131 Karlsruhe, Germany
Wolfgang Menesklou
Affiliation:
Institut für Werkstoffe der Elektrotechnik IWE, Universität Karlsruhe (TH), Adenauerring 20b, 76131 Karlsruhe, Germany
Ellen Ivers-Tiffée
Affiliation:
Institut für Werkstoffe der Elektrotechnik IWE, Universität Karlsruhe (TH), Adenauerring 20b, 76131 Karlsruhe, Germany
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Abstract

Sr(Tix, Fe1-x)O3-δ solid solutions were found to change their temperature coefficient of resistance (TCR) from negative to positive as iron increasingly substitutes for titanium, with the TCR tending towards zero at × = 0.35. This composition, Sr(Ti0.65Fe0.35)O3-δ thus shows temperature independent characteristic.

For the development of a planar type sensing element for automotive applications, Sr(Ti, Fe)O3-δ has to be applied as a thick film. To confirm the sensor characteristic temperature independence (at T = 750…950 °C, p O2 = 10−5…1 bar) and fast response times (t90 = 6.5 ms at 900 °C), both key issues of Sr(Ti, Fe)O3-δ, thick film sensors have to be maintained over the entire lifetime. In this work, the structural and electrical properties of the sensor are investigated with regard to the chemical stability of the sensing element.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 828: Symposium A – Semiconductor Materials for Sensing , 2004 , A3.7/K4.7
Copyright
Copyright © Materials Research Society 2005

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References

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