Microstructure and Crystal Chemistry of Eutectic Al2O3/Y3Al5O12Fibers Modified by the Partial Substitution of SC2O3for Al2O3.

K. Sugiyama, M. Nakai, A. Yoshikawa, T. Fukuda

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Al2O3(corundum)/Y3Al5O12(garnet, YAG) eutectic fiber samples were produced by the micro-pulling-down (μ-PD) method and the substitution of SC2O3for Al2O3in the Al2O3/Y3Al5O12eutectic fibers was studied by a scanning electron microscope (SEM) and electron backscattering diffraction (EBSD) together with X-ray diffraction (XRD). The substitution of SC2O3up to 5mol% appears to enhance the formation of the colony texture in the typical “Chinese script structure” with an ordinary crystallographic 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% SC2O3induced 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.

Original languageEnglish
Pages (from-to)89-96
Number of pages8
JournalHigh Temperature Materials and Processes
Volume28
Issue number1-2
DOIs
Publication statusPublished - 2009 Apr 17

Keywords

  • X-ray diffraction
  • chemical substitution
  • corundum
  • crystal
  • eutectic fiber
  • garnet
  • orientation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Physical and Theoretical Chemistry

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