摘要
采用柠檬酸溶胶-凝胶法合成一系列La1-xKxFeO3(x=0,0.1,0.2,0.3,0.5)纳米粉体,并对其物相及气敏性进行研究,结果表明:对LaFeO3的A位进行K+掺杂后的La1-xKxFeO3仍具有LaFeO3斜方晶系钙钛矿结构;K+的掺入可以抑制晶粒的长大且明显提高材料的导电能力;La0.7K0.3FeO3材料对3×10-4g/cm3乙醇具有较高的灵敏度、良好的选择性及较短的响应-恢复时间.
The nanopowders of La1- xKxFeO3（ x =0,0.1,0.2,0.3,0.5） were prepared by a citric acid solgel method. Their microstructure and ethanol-sensing properties were investigated. The results showed that with the doping of K＋the obtained powders were an orthorhombic perovskite structure,and the doping of K＋could restrained the growth of the grain size. The K＋doping enormously enhanced the conductivity of the samples. The gas sensors based on the La0. 7K0. 3FeO3 showed higher sensitivity to 3 × 10^-4g /cm^3 ethanol gas,and had better selectivity and response-recovery.
出处
《郑州轻工业学院学报（自然科学版）》
CAS
2014年第4期12-15,共4页
Journal of Zhengzhou University of Light Industry:Natural Science
基金
郑州轻工业学院博士基金项目(2011BSJJ010)
关键词
钙钛矿
铁酸镧
电性能
气敏性能
perovskite
LaFeO3
electrical property
gas sensing property
