Title

Effect of nonstoichiometry on the terahertz absorption of Y3Al5O12 optical ceramics

Authors

Authors

R. Gaume; D. Steere;S. K. Sundaram

Comments

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Abbreviated Journal Title

J. Mater. Res.

Keywords

YTTRIUM-ALUMINUM-GARNET; INFRARED LATTICE SPECTRA; RARE-EARTH ALUMINUM; IRON GARNETS; SPECTROSCOPY; CRYSTALS; GALLIUM; LASERS; RANGE; Materials Science, Multidisciplinary

Abstract

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 Title

Journal of Materials Research

Volume

29

Issue/Number

19

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

2338

Last Page

2343

WOS Identifier

WOS:000344475900013

ISSN

0884-2914

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