Effect of nonstoichiometry on the terahertz absorption of Y3Al5O12 optical ceramics
Abbreviated Journal Title
J. Mater. Res.
YTTRIUM-ALUMINUM-GARNET; INFRARED LATTICE SPECTRA; RARE-EARTH ALUMINUM; IRON GARNETS; SPECTROSCOPY; CRYSTALS; GALLIUM; LASERS; RANGE; Materials Science, Multidisciplinary
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.
Journal of Materials Research
"Effect of nonstoichiometry on the terahertz absorption of Y3Al5O12 optical ceramics" (2014). Faculty Bibliography 2010s. 5351.