No abstract

This work describes the thermal decomposition behaviour of cerium oxy-carbonate. DTA, TG, DTG and X-ray examinations were performed.The results indicate that the thermal decomposition of cerium oxy-carbonate in static air at a heating rate of l0 deg min -1 involves three steps: dehydration at 58 ~ removal of crystal water at 200 ~ and CO/release at 235 '~C.The activation energies of removal of crystal water and carbon dioxide release were found to be 59.48 and 82.33 kJ tool-t, respectively.Ceria-based oxygen ion conductors have high ionic conductivity, which makes them interesting materials for application as solid electrolytes at moderate temperature (< 600~ oxygen sensors and fuel cells [1]. The powder preparation is an important step in the fabrication of homogeneous materials. Chemical coprecipitation has been used. The properties of the final product (the sintered material or a mixed oxide powder) are largely dependent on the precipitation conditions. Precipitation as oxalate followed by calcination has been used to prepare doped oxide powders.This work describes a study of the thermal analysis and X-ray diffraction of cerium oxy-carbonate, which was prepared by precipitation from cerium nitrate solution with ammonium carbonate in the presence of ammonium hydroxide , [2].