Thermopower and Conductivity of Aerosol Deposited Gas Sensitive BaFe1-xTaxO3-δ Films

Titelangaben

Bektas, Murat ; Stöcker, Thomas ; Hagen, Gunter ; Moos, Ralf:
Thermopower and Conductivity of Aerosol Deposited Gas Sensitive BaFe1-xTaxO3-δ Films.
2017
Veranstaltung: Sensor 2017 : 18th International Conference on Sensors and Measurement Technology , 30.05.-01.06.2017 , Nürnberg, Deutschland.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Poster )
DOI: https://doi.org/10.5162/sensor2017/P5.9

Volltext

Link zum Volltext (externe URL):

Abstract

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 0.01 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.