In the present paper, the La_1–2xBa_xBi_xFeO₃ (x = 0.00, 0.05, 0.10, 0.15 and 0.20) nanosized perovskite materials have been successfully prepared by the auto-combustion route using the glycine as fuel. The structural, morphological, and gas sensing properties of these samples have been investigated. The Rietveld refinement has revealed a single orthorhombic phase (Pnma space group) for the compounds with x ≤ 0.10, while the samples with x = 0.10 and 0.20 have been found to contain a minor amount of two secondary phases. We have confirmed that the La_0.8Ba_0.1Bi_0.1FeO₃ (x = 0.10) compound possesses the smallest average particle size (34.58 nm) with the purely orthorhombic structure and exhibits a high surface roughness, as determined by atomic force microscopy measurements. Importantly, the gas sensing tests have been carried out for all prepared compounds with different ethanol and H2S gas concentrations (from 5 to 100 ppm). The La_0.8Ba_0.1Bi_0.1FeO₃ (x = 0.10) compound has been proven to exhibit excellent performance in ethanol and H₂S gas response even for very low concentrations (5 ppm) with an optimum operating temperature of 180 and 200 °C, respectively. Furthermore, the response and recovery times analyzed for both these gases were found to be very short (between 5 and 10 s).

在本文中，以甘氨酸为燃料，通过自燃路线成功制备了La _1–2x Ba _x Bi _x FeO ₃ (x = 0.00, 0.05, 0.10, 0.15 和 0.20)纳米钙钛矿材料。已经研究了这些样品的结构、形态和气敏特性。Rietveld 精修揭示了x ≤ 0.10化合物的单一正交相（Pnma空间群），而发现x = 0.10和0.20的样品含有少量的两个第二相。我们已经确认 La _0.8 Ba _0.1Bi _0.1 FeO ₃ (x = 0.10) 化合物具有最小的平均粒径 (34.58 nm)，具有纯正交结构，并表现出高表面粗糙度，如原子力显微镜测量所确定的。重要的是，已经对所有制备的化合物进行了气敏测试，这些化合物具有不同的乙醇和 H2S 气体浓度（从 5 到 100 ppm）。La _0.8 Ba _0.1 Bi _0.1 FeO ₃ (x = 0.10) 化合物已被证明在乙醇和 H _{2 中}表现出优异的性能即使在最佳工作温度分别为 180 和 200 °C 的情况下，S 气体的响应也非常低（5 ppm）。此外，发现分析这两种气体的响应和恢复时间非常短（5 到 10 秒）。