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Sr(Ti,Fe)O3: Materials for a Temperature Independent Resistive Oxygen Sensor

Published online by Cambridge University Press:  15 February 2011

W. Menesklou
Affiliation:
×Universität Karlsruhe (TH), Institut für Werkstoffe der Elektrotechnik, Germany, [email protected]
H.-J. Schreiner
Affiliation:
×Universität Karlsruhe (TH), Institut für Werkstoffe der Elektrotechnik, Germany, [email protected]
R. Moos
Affiliation:
DaimlerChrysler Research, Friedrichshafen, Germany
K.H. Härdtl
Affiliation:
×Universität Karlsruhe (TH), Institut für Werkstoffe der Elektrotechnik, Germany, [email protected]
E. Ivers-Tiffée
Affiliation:
×Universität Karlsruhe (TH), Institut für Werkstoffe der Elektrotechnik, Germany, [email protected]
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Abstract

The metal oxide strontium titanate is a promising material for resistive high temperature oxygen sensors (T > 1000 K), that can be applied to control combustion engines. However, a disadvantage of this and of many other metal oxides is the strong temperature dependence of conductivity. In this work, we show that the temperature dependence of Sr(Ti1-x, Fex)O3-δ can be adjusted by the iron content. For x = 0.35 the thermal activation of the conductivity is near zero for a distinct temperature and oxygen partial pressure range (T = 1000 K - 1200 K, PO2 = 10 to 105 Pa). Short response times in the range of 10 ms can be realized by using sensors in thick film technology

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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