Yttrium(III) oxide
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Yttrium oxide, also known as yttria, is Y2O3. It is an air-stable, white solid substance.
Yttralox
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Yttralox is a transparent ceramic consisting of yttria (Y2O3) containing approximately 10% thorium dioxide (ThO2). It was one of the first transparent ceramics produced, and was invented in 1966 by Richard C. Anderson at the General Electric Research Laboratory while sintering mixtures of rare earth minerals.
A disc of Yttralox on a table
Richard C. Anderson, the inventor of Yttralox, holding an Yttralox disc
Image: Yttrium oxide at 100X magnification with discontinuous grain growth and pores
Image: Yttralox Y203 with Th O2 at 150X magnification