Thermal Decomposition of Rare Earth Metal Oxalates. III. Oxalates of Holmium, Erbium, Thulium, Ytterbium, Lutetium and Yttrium

Abstract
Thermal decompositions of the oxalates of the heavy rare earth metals and of yttrium were carried out on a Stanton thermobalance. These oxalates on precipitation and drying at 110° C for six hours, gave the trihydrates which were used in the decomposition studies. Dihydrates, stable in the temperature range 230 to 330° C were formed before complete dehydration. Maximum decomposition was found to take place between 400 and 460° C. Weight levels corresponding to oxide formation were obtained in the temperature range 680–700° C without any indication of formation of intermediate products.

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