Gadolinium oxide: Appearance: white, odorless amorphous powder. Density: 7.407g / cm3 monoclinic system density 8.297g / cm3 Melting point: 2330 ± 20 ℃ (there is information that is 2420 ℃). Solubility: insoluble in water, soluble in acid to generate the corresponding salts. When exposed in air, easy to absorb water and carbon dioxide in the air and deterioration. With ammonia, generating gadolinium hydrate precipitation. Used as yttrium aluminum and yttrium iron garnet dopants, medical devices sensitizing fluorescent material, nuclear reactor control materials, metal gadolinium preparation materials, manufacture magnetic bubble materials and optical prism additives.