Y3Al5O12

Yttrium aluminum garnet (YAG) is a synthetic ceramic compound belonging to the garnet family, characterized by its cubic crystal structure and exceptional optical and thermal properties. It is widely used in optics (laser crystals, scintillators, luminescent phosphors), precision bearings, and high-temperature structural applications due to its combination of hardness, chemical stability, and low thermal expansion. YAG is preferred over many alternatives because it offers tunable luminescence, excellent mechanical stability at elevated temperatures, and superior optical transparency in both visible and infrared wavelengths, making it the material of choice for solid-state lasers, medical imaging, and aerospace thermal barriers.