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

Y 3 Al 5 O 12 (YAG), Y 3 Ga 5 O 12 (YGG) and mixed Y 3 Al 5-x Ga x O 12 (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.