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Europium(III) sulfate

Europium(III) sulfate is a europium compound with the chemical formula (n = 0, 1, 4, or 8). It is a light pink crystalline solid, stable in air up to 670 °C. The octahydrate dehydrates to the anhydrous form at 375 °C.

Preparation

Europium(III) sulfate can be prepared by reacting europium(III) oxide with sulfuric acid:

Eu<sub>2</sub>O<sub>3</sub> + 3 H<sub>2</sub>SO<sub>4</sub> → Eu<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> + 3 H<sub>2</sub>O

It can also be precipitated from a solution of europium(III) nitrate upon the addition of sulfuric acid:

2 Eu(NO<sub>3</sub>)<sub>3</sub> + 3 H<sub>2</sub>SO<sub>4</sub> → Eu<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> + 6 HNO<sub>3</sub>

Reactions

Europium(III) sulfate can be reduced to europium(II) sulfate with hydrogen gas at 480-500 °C. At temperatures between 600-1000 °C an oxysulfide (Eu<sub>2</sub>O<sub>2</sub>S) forms instead.

References