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BaFe1-xTaxO3-δ : A material for temperature independent resistive oxygen sensors

Title data

Bektas, Murat ; Schönauer-Kamin, Daniela ; Hagen, Gunter ; Mergner, Angelika ; Bojer, Carina ; Lippert, Sonja ; Milius, Wolfgang ; Breu, Josef ; Moos, Ralf:
BaFe1-xTaxO3-δ : A material for temperature independent resistive oxygen sensors.
In: Sensors and Actuators B: Chemical. Vol. 190 (2014) . - pp. 208-213.
ISSN 0925-4005
DOI: https://doi.org/10.1016/j.snb.2013.07.106

Abstract in another language

The sensing properties for resistive oxygen sensors of BaFe1-xTaxO3-δ (BFT) were investigated as a function of the Tantalum content x (0.2 ≤ x ≤ 0.7). Bulk samples were produced by using the mixed-oxide route. X-ray diffraction pattern showed that the perovskite structure was obtained and no second phases were found up to x = 0.5. The electrical conductivity of sintered samples was determined in an oxygen concentration between 1% and 100% in a wide temperature range between 400 and 900 °C. Samples between x = 0.2 and 0.4 are p-type conducting perovskite oxides with almost zero thermal activation. The range, at which the temperature dependency is absolutely zero, shifts with x from 450 °C for x = 0.2 to about 800 to 900 °C for x = 0.4. Specimens of BaFe0.7Ta0.3O3-δ revealed the lowest overall temperature dependency in the entire temperature range. All samples up to x = 0.4 responded fast and reversibly to oxygen concentration changes, even at 400 °C.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Perovskite; Lambda sensor; Strontium iron titanate ferrate; Sensors for harsh environments
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I > Chair Anorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 28 Nov 2014 07:40
Last Modified: 20 Mar 2018 08:27
URI: https://eref.uni-bayreuth.de/id/eprint/3860