Abstract
Mechanical activation of CeO2–ZrO2–SiO2 mixtures was performed in a high energetic vibratory mill with WC lining and grinding media. It was shown that in air atmosphere the reduction of Ce4+ into Ce3+ took place at 1400°C. The Ce3+ ion is stable in air in the form of Ce2(WO4)3 contrary to the Ce3+ ion in Ce-silicates.
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