Microstructure and Crystal Chemistry of Eutectic Al2O3/Y3Al5O12 Fibers Modified by the Partial Substitution of Sc2O3 for Al2O3.

Al 2 O 3 (corundum)/Y 3 Al 5 O| 2 (garnet, YAG) eutectic fiber samples were produced by the micro-pulling-down (μ-PD) method and the substitution of Sc 2 O 3 for AI 2 O 3 in the Α1 2 Ο 3 /Υ 3 Α1 5 Οι 2 eutectic fibers was studied by a scanning electron microscope (SEM) and electron backscattering diffraction (EBSD) together with X-ray diffraction (XRD).The substitution of Sc 2 O 3 up to 5mol% appears to enhance the formation of the colony texture in the typical "Chinese script structure" with an ordinary crystal lographic relationship of [110] corundum // [111] garnet parallel to the solidification direction and [001] corundum // [211] garnet perpendicular to the solidification direction.Nevertheless, the further substitution up to 10mol% Sc 2 O 3 induced the primary growth of garnet rods parallel to the solidification direction, and the gap among them was filled by another Chinese script structure with the novel crystallographic relationship of [001] corundum // [100] garnet parallel to the solidification direction.The preference of Sc at the dodecahedral site of the garnet structure, was also confirmed by the single crystal X-ray diffraction.

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