【摘要】 采用溶胶-凝胶法首次制备出平均粒径为22.3 nm的La0.2Pb0.4Sr0.4FeO3的晶体,这种复合晶体是正交的钙钛矿型结构.通过对其导电性和气敏性的研究,发现La0.2Pb0.4Sr0.4FeO3材料是一种p型半导体材料,并且在175℃下对甲醛具有很好的气敏性.更多还原

【Abstract】 A nanocrystalline La_0.2Pb_0.4Sr_0.4FeO₃ with an average grain size about 22.3 nm was prepared by a sol-gel method.The complex crystal is of perovskite phase with orthorhombic structure.The conductivity and gas sensitivity of La_0.2Pb_0.4Sr_0.4FeO₃ were investigated.Results demonstrate that the prepared La_0.2Pb_0.4Sr_0.4FeO₃ shows a p-type semiconductor and has the best sensitivity to formaldehyde at an operating temperature of 175 ℃.更多还原