Effect of nonstoichiometry on the terahertz absorption of Y3Al5O12 optical ceramics
| Autor: | S. K. Sundaram, Daniel W. Steere, Romain Gaume |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Terahertz radiation Mechanical Engineering Doping Analytical chemistry chemistry.chemical_element Sintering Yttrium Condensed Matter Physics Terahertz spectroscopy and technology chemistry Mechanics of Materials Absorption band visual_art visual_art.visual_art_medium General Materials Science Ceramic Absorption (electromagnetic radiation) |
| Zdroj: | Journal of Materials Research. 29:2338-2343 |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/jmr.2014.236 |
| Popis: | We report the effect of nonstoichiometry on the terahertz absorption of fully dense optical ceramics of Y3Al5O12 and compare to that of undoped and 1 at.% Nd3+ doped single crystals. Our research is motivated primarily by the necessity of having better control of stoichiometry during the preparation of transparent yttrium aluminum garnet (YAG) ceramics. A set of twenty ceramic samples was prepared by solid-state sintering of Y2O3 and Al2O3 powder mixtures with compositions ranging from −0.62 to +0.96 mol% of Y2O3 on each side of the stoichiometric garnet composition. After sintering, the samples were highly translucent in the visible range, with attenuations better than 2 cm−1. These samples were characterized using time-domain terahertz spectroscopy between 0.06 and 2.8 THz. Ceramic and single-crystal samples exhibit a similar broad absorption band, which we assign to a 2-phonon difference process, and whose width and intensity depend upon composition. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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