Synthesis and thermolysis of amorphous lanthanum oxyhydrate

Amorphous lanthanum oxyhydrate was synthesized by various procedures under various conditions. Thermolysis of air-dry specimens, both freshly prepared and aged, was studied by thermal analysis. It was found that there exist m any amorphous lanthanum oxyhydrates, which differ in composition and therma l behavior from stoichiometric lanthanum trihydroxide. The factors governin g the thermal behavior of the oxyhydrates were revealed.