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Samarium sesquioxide, Sm2O3

Samarium sesquioxide, or samaria, Sm2O3, may be prepared by the ignition of the hydroxide, carbonate, nitrate, oxalate, etc. It is an almost white powder with a faint yellow tinge, and its density is 8.347. It dissolves readily in acids. The corresponding hydroxide is a gelatinous precipitate that absorbs carbon dioxide from the air. The addition of ammoniacal hydrogen peroxide to a solution of a samarium salt causes the precipitation of a hydrated peroxide, Sm4O9.xH2O or probably Sm2O5.xH2O.

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