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Materials for temperature independent resistive oxygen sensors for combustion exhaust gas control

Title data

Moos, Ralf ; Menesklou, Wolfgang ; Schreiner, Hans-Jürgen ; Härdtl, Karl Heinz:
Materials for temperature independent resistive oxygen sensors for combustion exhaust gas control.
In: Sensors and Actuators B: Chemical. Vol. 67 (2000) Issue 1-2 . - pp. 178-183.
ISSN 0925-4005
DOI: https://doi.org/10.1016/S0925-4005(00)00421-4

Official URL: Volltext

Abstract in another language

Acceptor and donor doped SrTi1−xFexO3−δ materials for novel temperature independent resistive oxygen sensors for lean-burn engine exhaust gases were prepared and characterized by X-ray diffraction. Their electrical resistance, R, was investigated in the oxygen partial pressure range from 10^−4 to 1 bar between 700°C and 1000°C. Doped and undoped samples with x=0.3 obey an R∝pO2^−1/5 power law. Undoped samples show negligible temperature dependence in a small oxygen partial pressure (pO2) range between 10^−2 and 3×10^−2 bar. Acceptor (Ga) doping shifts the pO2 range of negligible temperature dependence to lower pO2, whereas donor (La) doping results in a right-hand shift to higher pO2. Combined acceptor and donor doping leads to an extended pO2 range of negligible temperature dependence. At pO2=0.1 bar the temperature coefficient of resistance (TCR) of this material composition is always below 250 ppm/K in the complete investigated temperature range. At about 725°C and 975°C TCR=0 can be found.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Result of work at the UBT: No
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 03 Feb 2015 07:31
Last Modified: 04 Apr 2016 08:05
URI: https://eref.uni-bayreuth.de/id/eprint/6168