Synthesis and Characterization of La0.6M0.4Fe0.8Cr0.2O3-δ(M= Ca, Sr,Ba) by GNP Method and Conductivity

La0.6M0.4Fe0.8Cr0.2O3-δ(M=Ca, Sr, Ba) fine powders were synthesized by a glycine-nitrate process(GNP). BET test shows that the specific area of the obtained powders is over 20 m2·g-1. XRD test shows that the crystalline structure formed is at the stage of ignition by the method, the powder of La0.6Ca0.4Fe0.8Cr0.2O3-δ(LCFC) is pure cubic perovskite-type after calcined at 850℃ for 2h, and its relative density (sintered at 1100℃) is 95%. The primary powders of LSFC and LBFC are with two-phase structure and with poor sintering activities than that of LCFC at low temperature. The relative density of these ceramics sintered over 1300℃ is 95%. Four-probe technique tests indicate that the conductivity of doped-samples is two orders of magnitude higher than that of LaFeO3, The changes of conductivity with temperature below 700℃ are in accord with the conduction mechanism of small polarons. The electrical conductivity of LCFC at 800℃ is over 50 S/cm which indicates that LCFC may have potential application for IT-SOFC cathode.