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Inorganic Compounds & Salts

Rare Earth Oxides

Cerium, lanthanum, neodymium, yttrium and other rare earth oxides in powders, granules and pellets from 99.5% to 99.999% purity.
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Rare earth oxides are the starting point for phosphors, magnets, polishing compounds, catalysts and laser crystals. This sub-category supplies them in several purities and physical forms. Cerium oxide alone appears as Ceric oxide at 99.99% and 99.999%, a GR 99.9% grade, Cerium(IV) oxide powders at 0.5 µm, 1-3 µm and below 5 µm, granules of 0.7-3.5 mm and pellets of 1-3 mm at 99.99%.

Purity for rare earths is usually stated relative to total rare earth oxides (REO), so a 99.99% grade means other rare earths are below 100 ppm. Non-rare-earth impurities such as iron and silicon are listed separately. Physical form matters as much as purity, since polishing needs fine, controlled powder while evaporation and sputtering use pellets and granules.

  • Fine powders for polishing, catalysts and ceramics
  • Granules and pellets for evaporation sources
  • 5N grades for phosphors and optical crystals

Each lot ships with a COA and SDS. Larger quantities can be quoted for ceramic and catalyst users.

Rare Earth Oxides: questions buyers ask

What does REO basis mean in a rare earth purity?
REO stands for rare earth oxide. A purity stated on an REO basis compares the target oxide with all rare earth oxides present, so 99.99% means other rare earths total less than 0.01%. Non-rare-earth impurities, such as calcium, iron or silicon, are reported separately on the COA.
Why is cerium oxide used for glass polishing?
Cerium oxide polishes glass through a combined chemical and mechanical action, reacting with the glass surface while removing material gently. It gives a high-quality finish on lenses, mirrors and display glass. Particle size and size distribution control polishing speed and surface quality, so choose the powder grade accordingly.
Which form of cerium oxide suits thin-film evaporation?
Pellets and granules are preferred for electron-beam and thermal evaporation because they melt evenly and produce less spitting than powder. High purity, such as 99.99%, helps produce clean optical coatings. Choose a size that fits your crucible, typically 1 to 3 mm pellets.

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