BaFe_1-xTa_xO_3-未 - A material for temperature independent resistive oxygen sensors

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• 作者：Murat Bektas ; Daniela Sch枚nauer-Kamin ; Gunter Hagen ; Angelika Mergner ; Carina Bojer ; Sonja Lippert ; Wolfgang Milius ; Josef Breu ; Ralf Moos
• 关键词：Perovskite ; Lambda sensor ; Strontium iron titanate ferrate ; Sensors for harsh environments
• 刊名：Sensors and Actuators B: Chemical
• 出版年：January, 2014
• 年：2014
• 卷：190
• 期：Complete
• 页码：208-213
• 全文大小：1271 K

文摘

The sensing properties for resistive oxygen sensors of BaFe_1-xTa_xO_3-未 (BFT) were investigated as a function of the Tantalum content x (0.2 鈮?#xA0;x 鈮?#xA0;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 掳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 掳C for x = 0.2 to about 800 to 900 掳C for x = 0.4. Specimens of BaFe_0.7Ta_0.3O_3-未 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 掳C.