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LaBMnO_3-ZrO_2复合极限电流型氧传感器的制备与性能

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Abstract:

采用高温固相反应法制备了电导率为10-1S/cm数量级的LaBMnO3(B=Ca,Sr,Ba)致密扩散障混合导体陶瓷。用化学共沉淀法制备了高温电导率为10-2S/cm数量级的氧化钇稳定氧化锆(yttriastabilizedzirconia,YSZ)固体电解质陶瓷。用瓷片复合工艺将致密扩散障陶瓷与YSZ陶瓷复合,制备出了致密扩散障极限电流型氧传感器。对该传感器进行氧敏性能测试,结果表明以LaBMnO3为致密扩散障碍层、YSZ为固体电解质的极限电流型氧传感器,在体积分数为0~21%氧含量范围内,均能获得较好的极限电流平台,电流最大值达到12mA;出现极限电流平台的电压区间为0.6~1V;氧含量与极限电流呈指数对应关系,反应时间约10s。此传感器制备工艺简单、过程可控,为该传感器的理论与应用研究打下了基础。

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