P5.9 - Thermopower and conductivity of aerosol deposited gas sensitive BaFe1-xTax03-films
- AMA Conferences 2017
2017-05-30 - 2017-06-01
- Proceedings Sensor 2017
- P5 - Gas, Chemo and Biosensors
- M. Bektas, T. Stöcker, G. Hagen, R. Moos - University of Bayreuth (Germany)
- 727 - 729
In this study, the thermopower and the electrical conductivity of BaFe1-xTaxO3- sensor films were measured for x in the range of 0.1 to 0.45 (BFTx). Seebeck coefficient and conductivity were measured simultaneously between 400 and 850 °C under varying oxygen partial pressures from 10-2 to 1 bar. BFTx fine powders were prepared by a conventional mixed-oxide route. Crystal structure and phase purity were investigated by X-ray diffraction. BFTx thick-films were successfully deposited by the novel Aerosol Deposition Method (ADM) at room temperature on a special transducer. Both thermopower and electrical conductivity of samples with tantalum contents between x = 0.2 and 0.3 show almost no temperature dependency but dependent strongly on the oxygen partial pressure in the temperature range from 700 to 850 °C. Therefore making a combined, thermoelectric-conductometric sensing principle for temperature independent oxygen sensors is possible.