Combined resistive and thermoelectric oxygen sensor with almost temperature-independent characteristics
Combined resistive and thermoelectric oxygen sensor with almost temperature-independent characteristics
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DOI：
10.5194/jsss-7-289-2018
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发表时间：
2018-04-16
影响因子：
1
通讯作者：
Moos, Ralf
中科院分区：
文献类型：
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作者：
Bektas, Murat;Stoecker, Thomas;Moos, Ralf
本研究主要从两个方面展开。第一部分采用气溶胶沉积(ADM)法制备了Ta含量在0.1~0.4之间的BaFe(1-x)-0.01Al0.01TaxO_3-Delta(BFATx)厚膜，并对其材料性能进行了表征，找出了BFATx的最佳组成。在不同氧分压下，在600-800℃范围内测定了材料的性能“塞贝克系数”和“电导率”。BaFe0.69Al0.01Ta0.3O3-Delta(BFAT30)由于其电导率和Seebeck系数几乎与温度无关而具有很好的应用前景。在本研究的第二部分，将BFAT30薄膜制备在包括加热器、等电位层和特殊电极结构的特殊换能器上，以实现BFAT30的直接热电/阻式氧传感器，该传感器具有被测对象、塞贝克系数和电导的几乎与温度无关的特性。在高氧分压(Po(2)和gt；10(-5)bar)下，传感器的电导表现出m=0.24的氧灵敏度(其中m是根据sigmaαPo(2)(M)的行为的对数西格玛与对数Po(2)表示中的斜率)，而塞贝克系数在700℃时以每十年Po(2)的斜率-38u V K-1变化。10(-14)bar)，电导和塞贝克系数随Po(2)变化，斜率分别为m=-0.23和-21.2µVK-1/十年Po(2)。
The present study is focused in two directions. In the first part, BaFe(1-x)-0.01Al0.01TaxO3-delta (BFATx) thick films with a Ta content between 0.1 and 0.4 were manufactured using the novel room temperature coating method "aerosol deposition" (ADM), and its material properties were characterized to find the best composition of BFATx for temperature-independent oxygen sensors. The material properties "Seebeck coefficient" and "conductivity" were determined between 600 and 800 degrees C at different oxygen partial pressures. BaFe0.69Al0.01Ta0.3O3-delta (BFAT30) was found out to be very promising due to the almost temperature-independent behavior of both the conductivity and the Seebeck coefficient. In the second part of this study, films of BFAT30 were prepared on a special transducer that includes a heater, equipotential layers, and special electrode structures so that a combined direct thermoelectric/resistive oxygen sensor of BFAT30 with almost temperature-independent characteristics of both measurands, Seebeck coefficient and conductance could be realized. At high oxygen partial pressures (pO(2) > 10(-5) bar), the electrical conductance of the sensor shows an oxygen sensitivity of m = 0.24 (with m being the slope in the log sigma vs. log pO(2) representation according to the behavior of sigma alpha pO(2)(m)), while the Seebeck coefficient changes with a slope of -38 mu V K-1 per decade of pO(2) at 700 degrees C. However, at low pO(2) (pO(2) < 10(-14) bar) the conductance and the Seebeck coefficient change with pO(2), with a slope of m = -0.23 and -21.2 mu V K-1 per decade pO(2), respectively.