yttrium oxide
Yttrium oxide, also known as yttria is an air-stable, white solid substance. Used to make Eu:YVO4 and Eu:Y2O3 phosphors that give the red color in color TV picture tubes, to make yttrium iron garnets used in microwave filters, and to make the high temperature superconductor YBa2Cu3O7. - http://en.wikipedia.org/wiki/Yttrium_oxide
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