Formation of lanthanum hydroxide and oxide via precipitation

摘要

Lanthanum hydroxide and oxide were prepared by the precipitation method in an aqueous medium at room temperature. The precipitate was examined using thermal analysis, X-ray diffraction and Scanning Electron Microscopy to investigate the phase evaluation and the thermal transformation by decomposition. The as-precipitated powder from the precipitation method was hexagonal La(OH)_3. The lanthanum hydroxide was decomposed to oxide in two-steps as La(OH)_3 → LaOOH + H_2O and 2LaOOH → La_2O_3 + H_2O.