Aluminium–Gallium Substitution in Yttrium Garnets Investigated by NMR and X-Ray Absorption

Abstract

Y3Al5O12 (YAG), Y3Ga5O12 (YGG) and mixed Y3Al5—xGaiixO12 (x = 0.5, 1, 2, 3, 4.5) have been synthesised by a sol–gel process. From the X-ray diffraction analysis the crystallised powders were shown to present a garnet structure with unit cell parameters agreeing well with those of single crystals. The aluminium–gallium substitution of the garnet structure has been studied by NMR and EXAFS techniques.