Hydrothermal equilibria in Ln2O3-water systems for neodymium, samarium, ytterbium, and yttrium.

Studies at 200-900° and 130-1700 atm. established the existence of the phases Nd(OH)3, NdO(OH)3 Nd2O2(CO3), Sm(OH)3, SmO(OH), Y(OH)3, YO(OH), YbO(OH), and Yb2O3. [on SciFinder(R)]