Effect of nonstoichiometry on the terahertz absorption of Y3Al5O12 optical ceramics

    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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