NO2-sensitive LaFeO3 film prepared by thermal decomposition of the heteronuclear complex, {La[Fe(CN)6]·5H2O}x

Abstract

Phase pure perovskite-type LaFeO₃ powders have been prepared by the thermal decomposition of a cyanidebridged heteronuclear complex. Formation of the perovskite was confirmed for the sample sintered in air at 300 °C for 1 h. The mean particle diameter and the specific surface area were 200 nm and 5 m² g^–1, respectively, (sample density = 6.67 g cm^–3) for the LaFeO₃ obtained by calcining at 1000 °C. The conductivity of an LaFeO₃ thick film formed by sintering at 1000 °C, increased when the measuring atmosphere was changed from air to NO₂, and returned to the original level after NO₂ was removed above 350 °C. The mechanical strength of the film was improved by sintering with glass resin.