Materials for temperature independent resistive oxygen sensors for combustion exhaust gas control
Materials for temperature independent resistive oxygen sensors for combustion exhaust gas control
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DOI：
10.1016/s0925-4005(00)00421-4
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发表时间：
2000-08-10
影响因子：
8.4
通讯作者：
Härdtl, KH
中科院分区：
文献类型：
--
作者：
Moos, R;Menesklou, W;Härdtl, KH
制备了用于稀燃发动机排气的新型温度无关电阻式氧传感器的SrTi 1-xFexO 3-delta材料，并通过X射线衍射对其进行了表征。在700 ℃至1000 ℃之间，在10（-4）至1巴的氧分压范围内研究它们的电阻R。x = 0.3的掺杂和未掺杂样品服从R α pO（-1/5）幂律。未掺杂的样品在10（-2）和3 X 10（-2）bar之间的小氧分压（pO（2））范围内显示出可忽略的温度依赖性。受主（Ga）掺杂使pO（2）的温度依赖性可忽略的范围向较低的pO（2）移动，而施主（La）掺杂导致向右移动到较高的pO（2）。结合受体和供体掺杂导致可忽略的温度依赖性的扩展的pO（2）范围。在pO（2）= 10（-1）巴时，该材料组合物的电阻温度系数（TCR）在整个研究温度范围内总是低于250 ppm/K。在约725摄氏度和975摄氏度，可以发现TCR = 0。All rights reserved.
Acceptor and donor doped SrTi1-xFexO3-delta materials for novel temperature independent resistive oxygen sensors for lean-burn engine exhaust gases were prepared and characterized by X-ray diffraction. Their electrical resistance, R, was investigated in the oxygen partial pressure range from 10(-4) to 1 bar between 700 degrees C and 1000 degrees C. Doped and undoped samples with x = 0.3 obey an R alpha pO(-1/5) power law. Undoped samples show negligible temperature dependence in a small oxygen partial pressure (pO(2)) range between 10(-2) and 3 X 10(-2) bar. Acceptor (Ga) doping shifts the pO(2) range of negligible temperature dependence to lower pO(2), whereas donor(La) doping results in a right-hand shift to higher pO(2). Combined acceptor and donor doping leads to an extended pO(2) range of negligible temperature dependence. At pO(2) = 10(-1) bar the temperature coefficient of resistance (TCR) of this material composition is always below 250 ppm/K in the complete investigated temperature range. At about 725 degrees C and 975 degrees C TCR = 0 can be found. (C) 2000 Elsevier Science S.A. All rights reserved.