Because CeO2 is remarkably insoluble in water and in dilute acid. It is commonly used as an abrasive; the powder is used in the grinding/polishing of other materials.
Cerium Oxide (CeO2): Synthesis, Properties and Applications - 1st Edition
Cerium Oxide: Applications and Environmental Considerations
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Advances in the Study of Cerium Oxide Nanoparticles: New Insights into Antiamyloidogenic Activity
Cerium oxide nanostructures: properties, biomedical applications and surface coatings
Synthesis and biomedical applications of nanoceria, a redox active nanoparticle, Journal of Nanobiotechnology
Functionalization of Cerium Oxide Nanoparticles to Influence Hydrophobic Properties
Biomedical applications of cerium oxide nanoparticles: a potent redox modulator and drug delivery agent - ScienceDirect
Pro-Oxidant Therapeutic Activities of Cerium Oxide Nanoparticles in Colorectal Carcinoma Cells
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Cerium oxide nanostructures: properties, biomedical applications and surface coatings