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Ruthenium Sesquioxide, Ru2O3

When strongly heated in air ruthenium yields a bluish black Ruthenium Sesquioxide, Ru2O3 which is not reduced at white heat. Claus believed that the sesquioxide, Ru2O3, could be produced in this way, but Gutbier and Ransohoff have adduced evidence in favour of the assumption that the product is not a well-defined oxide, but an intimate mixture of ruthenium and its dioxide, RuO2. No other method tried by the last-named authors yielded the sesquioxide in the anhydrous condition, although decomposition of the corresponding hydroxide, Ru2(OH)6, by ignition in a current of carbon dioxide gave indications that the oxide is capable of existence.

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