Cerium hydroxide samples prepared with different precipitating agents (NaOH, KOH, NH4-OH) have been studied by thermogravimetry, X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR). The untreated samples are a mixture of CeO2 and Ce(OH)4 with a small quantity of Ce(OH)3 present in the bulk of the solid. A part of the Ce3+ species remains stable even after calcination a t high temperatures (1073 K) under air. The residual alkali elements issuing from the precipitating agents induce variations on the final state of the solid.

No abstract

No abstract

No abstract