Abstract
The thermal decomposition of rare earth and yttrium bromide hydrates was studied by the thermogravimetric method. Two groups of reactions were found: MBr 3·6H 2O → MBr 3·H 2O → MBr 3 → MOBr → M 2O 3 The bromides of PrEu belong to this group. Neither lanthanum nor cerium give the monohydrate, and cerium also does not give the oxybromide. MBr 3·6H 2O → (MBr 3 + MOBr) → MOBr → M 2O 3 The bromides from Gd to Lu belong to this group. The minimum temperature for oxybromide formation was 350–550°C.
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