Abstract
New information on the defects in high temperature (HT) grown YAG (Y 3Al 5O 12) and GGG(Gd 3Ga 5O 12) obtained from X-ray and optical spectroscopy of various rare earth dopants are presented. Low intensity 2 2 2 X-ray reflections, forbidden in the cubic garnet Ia3d space group, with equivalent intensities for the four [1 1 1] directions are observed in both crystals. Structural arguments in connection with optical spectroscopy data on various ions (Nd 3+, Tm 3+, Pr 3+) allow us to assign these reflections (absent in flux grown crystals) to local reduction of symmetry introduced by nonstoichiometric random occupancy of octahedral sites by Y 3+ or Gd 3+ ions in HT garnets.
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