Orientation relationships of unidirectionally aligned GdAlO3/Al2O3 eutectic fibers

Yoshihiro Ohashi, Nobuhiro Yasui, Tatsuya Suzuki, Masatoshi Watanabe, Toru Den, Kei Kamada, Yuui Yokota, Akira Yoshikawa

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


Unidirectionally solidified rare-earth activated GdAlO3(GAP)/Al2O3 eutectic crystal with well-aligned fibrous structure exhibits excellent light guiding property and can be used as a scintillator plate for high-resolution X-ray imaging. In this paper, the microstructures and orientation relationships of the GAP/Al2O3 eutectic fibers were investigated. The regular GAP single crystal fibers with a hexagonally close-packed arrangement grew straight in the same direction along the solidification direction, and were embedded in a c-axis oriented Al2O3 single crystal matrix. The majority of GAP fibers had the orientation relationships of [010]GAP//[0001]Al2O3 to the growth direction and (1 0 0)GAP//(1 1 2 0)Al2O3 to the interface plane, while slight misorientation angle of both [010]GAP axis and (100)GAP plane were observed. In the GAP/Al2O3 interface boundary, the lattice misfit between the two phases was relieved by insertion of extra half-planes on the Al2O3 side.

Original languageEnglish
Pages (from-to)3849-3857
Number of pages9
JournalJournal of the European Ceramic Society
Issue number15
Publication statusPublished - 2014 Dec


  • Directional solidification
  • EBSD
  • Eutectics
  • Scintillator
  • Transmission electron microscopy


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