Yttrium oxide, also known as yttria, is Y2O3. It is an air-stable, white solid substance.
Y 1240 (OTTO) Yttrium oxide, 1-2 μm, 99.99% Cas no 1314-36-9 - used to make yttrium iron garnets, which are very effective microwave filters. Y 1240 (OTTO) Yttrium oxide, 1-2 μm, 99.99% Cas no 1314-36-9 - used as a common starting material for both materials science as well as inorganic compounds.