Abstract
Abstract The thermal decomposition of hydrated cerous oxalate has been studied by means of thermogravi- metry, differential scanning calorimetry, infrared spectroscopy, powder X-ray diffraction, magneto- chemistry, and X-ray photoelectron spectroscopy. Materials were isothermally calcined at appropriate temperatures and then subjected to a sertes of spectroscopic investigations. It was found that the dehydration and oxalate decomposition steps were effectively merged into a concerted decomposition when isothermal heating conditions were used. The only product identifiable by powder X-ray diffraction in the calcination products was ceric oxide, CeO2. Magnetochemical data demonstrated that one could not form analytically pure ceric oxide in the temperature range studied and that substantial amounts of amorphous cerlum(III) products were also obtained. These observations were corroborated by detailed X-ray photoelectron spectroscopic studies of the materials.
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