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19 December 1986 Lanthana-Doped Yttria: A New Infrared Window Material
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Lanthana-doped yttria has a number of favorable intrinsic properties for infrared window applications. La203 is a sintering aid which makes possible pore-free transparent polycrystalline near-net-shape domes and windows by a unique transient second solid-phase sintering technique. This same second phase can be retained by special anneals to impart mechanical toughening by a second-phase crack-deflection mechanism. Transmission electron microscopy has been utilized to characterize crack deflection and the complex second phase nucleation and growth process. Reduced absorption coefficients have been achieved through improved processing, 0H- removal, and stoichiometry adjustments. The trade-off between mechanical and optical properties has been quantified, and a region of promising compromise identified.
© (1986) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
W. H. Rhodes, G. C. Wei, and E. A. Trickett "Lanthana-Doped Yttria: A New Infrared Window Material", Proc. SPIE 0683, Infrared and Optical Transmitting Materials, (19 December 1986);

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