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- Title
Solid-State Reactive Sintering of Transparent Polycrystalline Nd:YAG Ceramics.
- Authors
Sang-Ho Lee; Sujarinee Kochawattana; Messing, Gary L.; Dumm, John Q.; Quarles, Gregory; Castillo, Vida
- Abstract
Transparent polycrystalline Nd:YAG ceramics were fabricated by solid-state reactive sintering a mixture of commercial Al2O3, Y2O3, and Nd2O3 powders. The powders were mixed in methanol and doped with 0.5 wt% tetraethoxysilane (TEOS), dried, and pressed. Pressed samples were sintered from 1700° to 1850°C in vacuum without calcination. Transparent fully dense samples with average grain sizes of ∼50 μm were obtained at 1800°C for all Nd2O3 levels studied (0, 1, 3, and 5 at.%). The sintering temperature was little affected by Nd concentration, but SiO2 doping lowered the sintering temperature by ∼100°C. Abnormal grain growth was frequently observed in samples sintered at 1850°C. The Nd concentration was determined by energy-dispersive spectroscopy to be uniform throughout the samples. The in-line transmittance was >80% in the 350–900 nm range regardless of the Nd concentration. The best 1 at.% Nd:YAG ceramics (2 mm thick) achieved 84% transmittance, which is equivalent to 0.9 at.% Nd:YAG single crystals grown by the Czochralski method.
- Subjects
POLYCRYSTALS; SINTERING; SPECTRUM analysis; POWDER metallurgy; ISOSTATIC pressing; METHANOL; VACUUM metallurgy
- Publication
Journal of the American Ceramic Society, 2006, Vol 89, Issue 6, p1945
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2006.01051.x