Abstract
Transparent polycrystalline nanoceramics consisting of triclinic Al2SiO5 kyanite (91.4 vol%) and Al2O3 corundum (8.6 vol%) were fabricated at 10 GPa and 1200-1400°C. These materials were obtained by direct conversion from Al2O3-SiO2 glasses fabricated using the aerodynamic levitation technique. The material obtained at 10 GPa and 1200°C shows the highest optical transparency with a real in-line transmission value of 78% at a wavelength of 645 nm and a sample-thickness of 0.8 mm. This sample shows equigranular texture with an average grain size of 34 ± 13 nm. The optical transparency increases with decreasing mean grain size of the constituent phases. The relationship between real in-line transmission and grain size is well explained by a grain-boundary scattering model based on a classical theory.
Original language | English |
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Pages (from-to) | 998-1003 |
Number of pages | 6 |
Journal | Journal of the American Ceramic Society |
Volume | 101 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2018 Mar |
Externally published | Yes |
Keywords
- alumina
- aluminosilicates
- nanocomposites
- transparent ceramics
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry