Abstract
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 language | English |
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Pages (from-to) | 3849-3857 |
Number of pages | 9 |
Journal | Journal of the European Ceramic Society |
Volume | 34 |
Issue number | 15 |
DOIs | |
Publication status | Published - 2014 Dec |
Keywords
- Directional solidification
- EBSD
- Eutectics
- Scintillator
- Transmission electron microscopy
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry