Abstract
The mechanisms responsible for the coloration of Y3Al5O12 (YAG) crystals are analyzed. The conditions are optimized for growing, in a reducing atmosphere, uniformly colored YAG-based crystals reproducing the color of both red and green natural garnets. The compositions ensuring a wide range of hues are Y,Zr,Ln3(Al,Sc)2Al3O12 (red), Y,Yb,Ln3(Al,Zr)2Al3O12 (green), and Y,Eu,Tb3(Al,Zr)2Al3O12 (blue). Data on the microhardness and microbrittleness of the crystals and their chromaticity diagrams are presented.
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