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Abstract
The thermal decomposition of thorium oxalate dihydrate has been studied in the temperature region 270–900°C in both air and nitrogen atmospheres. The water of hydration is readily removed at 270°. At 300° decomposition takes place with liberation of CO and CO 2, the quantity of CO being slightly greater than that of CO 2. The results are compatible with formation of a carbonate as an intermediary in the degradation process. Some free carbon is found which is probably formed by disproportionation of CO. The thoria prepared at low temperatures 300–500° from the oxalate has a small crystallite size and is hygroscopic.
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