Abstract
The La 1− x Mg x FeO 3 powder was prepared by sol–gel method using citric acid. The compounds crystallized were perovskite phase with orthorhombic structure. The Mg-doping restrains the growth of the grain size. The conductivity and gas sensing of La 1− x Mg x FeO 3-based sensors were investigated. We found the La 0.92Mg 0.08 FeO 3-based sensors have the best response and selectivity to ethanol gas. Great differences on the conductance–temperature curves of La 0.92Mg 0.08 FeO 3-based sensors between in ethanol gas and air or other gas such as H 2, CO and CH 4 were also found. The conductance in ethanol gas decreased with temperature from 130 to 240 °C. But in air and other gas such as H 2, CO and CH 4 the conductance increases all the time. It indicates that at 240 °C the conductance difference between air and ethanol was the biggest and the response reach the maximum.
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