A novel method for preparation of a dense diffusion barrier limiting current oxygen sensor is presented. The dense thin-layer with the nominal composition Sr-, Mg- and Fe-doped lanthanum gallate (LSGMF) was prepared over La_0.8Sr_0.2Ga_0.8Mg_0.2O_3–δ (LSGM) electrolyte by a thermal diffusion method. The crystal structure, morphology, elemental distribution, conductivity, and sensing performance of the prepared sample were investigated. X-ray diffraction (XRD) analysis shows a highly crystalline perovskite. SEM-EDS analysis shows that the dense thin-layer with about 40 μm thickness is well attached to the solid electrolyte. Electrical conductivity measurement shows that the dense thin-layer has high conductivity of 8.73 S·cm⁻¹ at 800°C. The oxygen sensor exhibits good sensing performance. The variations of the limiting current (I_L) vs oxygen content (x(O₂)) can be obtained as follows:

中文翻译：

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一种制备致密扩散势垒极限电流氧传感器的新方法

提出了一种制备致密的扩散势垒极限电流氧传感器的新方法。在La _0.8 Sr _0.2 Ga _0.8 Mg _0.2 O _3–δ上制备了标称成分为Sr，Mg和Fe掺杂的没食子酸镧（LSGMF）的致密薄层（LSGM）电解质采用热扩散法。研究了所制备样品的晶体结构，形态，元素分布，电导率和感测性能。X射线衍射（XRD）分析显示出高度结晶的钙钛矿。SEM-EDS分析表明，具有约40μm厚度的致密薄层良好地附着于固体电解质。电导率测量表明，致密的薄层在800℃下具有8.73S·cm ^-1的高电导率。氧传感器表现出良好的感测性能。极限电流（I _L）相对于氧含量（x（O ₂））的变化可通过以下方式获得：