Europium(III) carbonate is an inorganic compound with the chemical formula Eu<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub>.
Europium(III) carbonate can be obtained by mixing and heating an aqueous solution of ammonium carbonate and europium(III) chloride. A saturated carbon dioxide ammonium carbonate solution (obtained from the reaction of hydrochloric acid and ammonium carbonate solution) can also precipitate europium carbonate from a europium salt solution. Other preparation methods include the thermal decomposition of europium(III) acetate and the reaction of a suspension of europium(III) oxide in water and supercritical carbon dioxide.
Europium(III) carbonate is soluble in acid and releases carbon dioxide:
Europium(III) carbonate decomposes at high temperatures to form europium(III) oxide: