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Proceedings Paper

Synthesis, characterization, and densification of Al[sub]2-x[/sub]Sc[sub]x[/sub](WO[sub]4[/sub])[sub]3[/sub] ceramics for low-expansion infrared-transparent windows
Author(s): Niladri Dasgupta; Bruce Butler; Erinn Sörge; Tzu-Chien Wen; Dinesh K. Shetty
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Paper Abstract

Materials and Systems Research, Inc. is developing a material with a low coefficient of thermal expansion (CTE) that could be used in an infrared-transparent window. The material is derived from a solid solution of Al2(WO4)3, which has positive thermal expansion, and Sc2(WO4)3 with a negative thermal expansion. An optimum composition of Al 0.5 Sc1.5(WO4)3 was identified by synthesizing solid solutions, Al2-xScx(WO4)3, by a solid-state route with compositions ranging from x = 0 to 2.0. A single orthorhombic phase was obtained at all compositions. A composition corresponding to x = 1.5 had a low CTE value of -0.15 x 10-6/oC in the temperature range, 25-700ºC. A low temperature solution combustion process was developed for this optimum composition resulting in a single phase powder with a surface area of ~ 14 m2/g and average particle size (as determined from surface area) of 91 nm. Preliminary densification experiments via dry uniaxial pressing and pressureless sintering at 1100°C for 2 hours resulted in a sintered compact 97.5% in density and submicron grain size.

Paper Details

Date Published: 20 May 2011
PDF: 11 pages
Proc. SPIE 8016, Window and Dome Technologies and Materials XII, 80160D (20 May 2011); doi: 10.1117/12.884035
Show Author Affiliations
Niladri Dasgupta, Materials and Systems Research, Inc. (United States)
Bruce Butler, Materials and Systems Research, Inc. (United States)
Erinn Sörge, Materials and Systems Research, Inc. (United States)
Tzu-Chien Wen, The Univ. of Utah (United States)
Dinesh K. Shetty, The Univ. of Utah (United States)


Published in SPIE Proceedings Vol. 8016:
Window and Dome Technologies and Materials XII
Randal W. Tustison, Editor(s)

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