TmO2

Thulium dioxide (TmO2) is a rare-earth oxide ceramic belonging to the lanthanide oxide family, valued for its high refractive index and optical transparency in the infrared spectrum. It is primarily used in specialized optical applications, phosphor materials, and radiation shielding, where its rare-earth properties enable performance not achievable with common ceramics. TmO2 is also investigated for potential use in advanced catalysis and as a component in high-temperature structural ceramics, though most applications remain in research or niche industrial settings rather than mainstream engineering.