BaFe1-xTaxO3-δ – A material for temperature independent resistive oxygen sensors
| Autor: | Gunter Hagen, Murat Bektas, Ralf Moos, Daniela Schönauer-Kamin, Carina Bojer, Josef Breu, Sonja Lippert, Angelika Mergner, Wolfgang Milius |
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| Rok vydání: | 2014 |
| Předmět: |
Diffraction
Resistive touchscreen Materials science Metals and Alloys Tantalum Analytical chemistry Mineralogy chemistry.chemical_element Atmospheric temperature range Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Electrical resistivity and conductivity Materials Chemistry Limiting oxygen concentration Electrical and Electronic Engineering Instrumentation Oxygen sensor Perovskite (structure) |
| Zdroj: | Sensors and Actuators B: Chemical. 190:208-213 |
| ISSN: | 0925-4005 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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