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Proceedings Paper

Lanthana-Doped Yttria: A New Infrared Window Material
Author(s): W. H. Rhodes; G. C. Wei; E. A. Trickett
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Paper Abstract

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.

Paper Details

Date Published: 19 December 1986
PDF: 7 pages
Proc. SPIE 0683, Infrared and Optical Transmitting Materials, (19 December 1986); doi: 10.1117/12.936410
Show Author Affiliations
W. H. Rhodes, GTE Laboratories Inc. (United States)
G. C. Wei, GTE Laboratories Inc. (United States)
E. A. Trickett, GTE Laboratories Inc. (United States)

Published in SPIE Proceedings Vol. 0683:
Infrared and Optical Transmitting Materials
Robert W. Schwartz, Editor(s)

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