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

Niladri Dasgupta; Bruce Butler; Erinn Sörge; Tzu-Chien Wen; Dinesh K. Shetty

doi:10.1117/12.884035

20 May 2011 Synthesis, characterization, and densification of Al_2-xSc_x(WO₄)₃ ceramics for low-expansion infrared-transparent windows

Niladri Dasgupta, Bruce Butler, Erinn Sörge, Tzu-Chien Wen, Dinesh K. Shetty

Author Affiliations +

Proceedings Volume 8016, Window and Dome Technologies and Materials XII; 80160D (2011) https://doi.org/10.1117/12.884035
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

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, Al_2-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.

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Niladri Dasgupta, Bruce Butler, Erinn Sörge, Tzu-Chien Wen, and Dinesh K. Shetty "Synthesis, characterization, and densification of Al_2-xSc_x(WO₄)₃ ceramics for low-expansion infrared-transparent windows", Proc. SPIE 8016, Window and Dome Technologies and Materials XII, 80160D (20 May 2011); https://doi.org/10.1117/12.884035

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