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cerium powder is one of the rare earths used in polishing, as it can produce a very fine polished surface. This powder is often used with flat lap polishing machines to remove light scratches from glass, mirrors and other surfaces.
Hi-Tech Diamond’s cerium oxide is optical grade, ground to half the size of most other cerium powders, providing an exceptional polish on a wide range of materials. It is a preferred polishing powder for many lapidary and jewelry applications.
Use it with felt and foam polishing pads, or a rotary polishing tool to achieve a smooth, shiny surface on a variety of items including glass, stone, crystals, ceramics, and jewelry. This cerium oxide is sold in convenient, ready-to-mix bottles and comes with a foam sponge applicator brush for easy application.
Several chemical techniques have been developed to synthesize nanocrystalline powders for applications in the manufacture of glasses, ceramics, phosphors, and catalysis. A number of methods rely on a change in pH or temperature to cause precipitation, although there are other approaches that do not rely on pH.
Matijevic and Hsu prepared non-spherical crystalline cerium oxide by precipitation with urea at elevated pH. The precipitate was hydrothermally treated to generate nanoscale crystallites weakly bonded within agglomerates. The agglomerates were not redispersed after treatment, but they had a narrow size distribution and high specific surface areas, indicating that surface forces can control the agglomerate morphology and size of the resulting powders.
A soft solution method was also developed to prepare nanocrystalline CeO2 powders by precipitation of a cerium nitrate precursor with citric acid in aqueous solution. The calcination temperature was found to be important in the size of the final crystalline particles, while the proportion of citric acid was also a significant factor in controlling the agglomerate morphology.