Thermal decomposition of uranyl nitrate hexahydrate

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Abstract
Samples of uranyl nitrate hexahydrate weighing between 3·5 and 14·7 mg. were decomposed in a hot air stream flowing at 455–673 cm./sec. and at temperatures between 100 and 350°. Values of percentage weight‐loss for various reaction times were obtained. The decomposition, which involved several phase changes, was also followed visually by means of a colour cine film.The results between 200° and 350° suggest that decomposition proceeds by way of two first‐order reactions: magnified image and magnified image where k1 is much greater than k2.These results do not agree with those of previous workers who used larger samples and lower gas flow rates and did not work in a purely chemical regime.

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