<Original Papers>On the Properties of Uranium and Thorium Compounds at High Temperature. (I) : On the Thermal Decompositions of Uranyl and Thorium Sulfates

The thermal decompositions of uranyl and thorium sulfates were investigated in a neutral atmosphere with thermogravimetric technique. Purified nitrogen having a constant flow rate was sent into the reaction vessel and pumped out through the O\u27 Gorman\u27s pressure controlling system. Then the reaction vessel could be maintained under constant pressure of a neutral atmosphere for several hours. Samples in the reaction vessel were heated with an electric furnace and the weight change was observed with a quartz spring thermobalance. The results obtained are summarised in the following formulae showing the relation between the decomposition pressure and temperature : [numerical formula