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On the defect chemistry of BaFe0.89Al0.01Ta0.1O3-δ, a material for temperature independent resistive and thermoelectric oxygen sensors

Title data

Bektas, Murat ; Stöcker, Thomas ; Hagen, Gunter ; Moos, Ralf:
On the defect chemistry of BaFe0.89Al0.01Ta0.1O3-δ, a material for temperature independent resistive and thermoelectric oxygen sensors.
In: Solid State Ionics. Vol. 316 (March 2018) . - pp. 1-8.
ISSN 0167-2738
DOI: https://doi.org/10.1016/j.ssi.2017.12.017

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No informationMO1060/22-1

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

The Seebeck-coefficient (aka thermopower) is a less wide-spread parameter to determine constants for defect chemical models of semiconductor oxides. It is a measure for the charge carrier concentration. In contrast to the often investigated electrical conductivity, it has the benefit of being independent of the material geometry. BaFe0.7Ta0.3O3‐δ is known as a temperature-independent conductometric oxygen sensor material with perovskite crystal structure. The present work considers the Seebeck-coefficient as well as the electrical conductivity of bulk and thick-film BaFe0.89Al0.01Ta0.1O3‐ δ (BFAT10). Seebeck-coefficient and electrical conductivity were measured simultaneously between 600 and 950 °C under varying oxygen partial pressures from 10− 24 to 1 bar. BFAT10 thick films have been successfully deposited by the novel Aerosol Deposition Method (ADM) at room temperature on a special transducer. The electrical conductivity of thick-film sensors shows almost no temperature dependency but depends strongly on the oxygen partial pressure in the temperature range from 600 to 800 °C. An n-to-p-type transition was observed in the investigated oxygen partial pressure and temperature range. The defect parameters were derived from the experimental results and an initial defect model for BFAT10 is discussed. A hopping-type conduction mechanism is assumed due to the very low charge carrier mobility.

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
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 10 Jan 2018 07:57
Last Modified: 08 Nov 2018 08:10
URI: https://eref.uni-bayreuth.de/id/eprint/41587