Polycrystalline La1-xKxCoO3 (0≤x≤0.2) rare earth cobaltates have been synthesized by a solution combustion method using glycine as a fuel.The synthesized ceramic materials were characterized by powder X-ray diffraction (XRD),scanning electron microscopy (SEM),Fourier transform infrared spectroscopy (FTIR),and magnetic measurements and studied for physical properties,such as photocatalytic activity.FTIR measurements in conjunction with XRD showed that phases beyond 10% K doping are accompanied by small amounts of impurities.Chemical titrations show the presence of Co4+ and account for the Co3+ -Co4+ mixed-valency of the system.The parent LaCoO3 shows spin-glass transition at low temperatures,whereas doped samples show transition from spin-glass behavior to paramagnetic ordering on progressive doping of K."Mixed-conductor" nature of these ceramics positions them as viable candidates for solid oxide fuel cell (SOFC) applications.
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