Barium Diuranate, BaU₂O₇

Barium Diuranate, BaU₂O₇, may be obtained by calcining the double barium uranyl acetate or precipitating it with barium hydroxide, or by heating green uranium oxide with barium chlorate. By crystallisation from solution in fused barium or sodium chloride it is obtained in yellowish-green leaflets.

A hydrated uranate is obtained as a yellow precipitate by the addition of ammonia to a mixture of barium chloride and uranyl nitrate solutions, or by precipitating uranyl nitrate with excess of barium hydroxide solution.