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Effect of SiO.
- Source :
-
Journal of the American Ceramic Society . May2011, Vol. 94 Issue 5, p1380-1387. 8p. 3 Black and White Photographs, 10 Graphs. - Publication Year :
- 2011
-
Abstract
- This paper examines the influence of SiO2 doping on densification and microstructure evolution in Nd3xY3-3xAl5O12 (Nd:YAG) ceramics. Nd:YAG powders were doped with 0.035-0.28 wt% SiO2 and vacuum sintered between 1484° and 1750°C. 29Si magic-angle spinning nuclear magnetic resonance showed that Si41 substitutes onto tetrahedrally coordinated Al3+ sites. High-resolution transmission electron microscopy showed no grain boundary second phases for all silica levels in samples sintered at 1600°-1750°C. Coarsening was limited by a solute drag mechanism as suggested by cubic grain growth kinetics and transmission electron microscopy energy-dispersive X-ray spectroscopy observations of increased Nd31 concentration near grain boundaries. Increasing SiO2 content increased both densification and grain growth rate and led to increasingly coarsening-dominated sintering trajectories. Fine-grained (< 3 μm), highly transparent (> 82% real in-line transmission) ceramics were produced by sintering 0.035 wt% SiO2-doped ceramics at 1750°C for 8 h. Coarse-grained (18 μm), transparent samples were obtained with 0.28 wt%SiO2-doped Nd:YAG when sintered at 1600°C for 8 h. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00027820
- Volume :
- 94
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Journal of the American Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 60232626
- Full Text :
- https://doi.org/10.1111/j.1551-2916.2010.04260.x