Fabrication of transparent spinel: the role of impurities

Ivar E. Reimanis; Keith Rozenburg; Hans-Joachim Kleebe; Ronald L. Cook

doi:10.1117/12.604622

18 May 2005 Fabrication of transparent spinel: the role of impurities

Ivar E. Reimanis, Keith Rozenburg, Hans-Joachim Kleebe, Ronald L. Cook

Proceedings Volume 5786, Window and Dome Technologies and Materials IX; (2005) https://doi.org/10.1117/12.604622
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

Densification and microstructural evolution of transparent magnesium aluminate spinel (MgAl₂O₄) were examined through systematic experiments that focus on the role of impurities in the starting powders. Up to 1 wt. % LiF was added to very fine spinel powder synthesized by a metal-exchange method. The material was densified by pressing at elevated temperatures. Very high transmissivity was achieved under appropriate conditions. A layered spinel/LiF/spinel specimen was also fabricated with the intent of better understanding the role of LiF on microstructure development. Its presence can lead to accelerated grain growth, or growth suppression, depending on a complex interplay of chemistry, concentration and processing schedule.

Citation Download Citation

Ivar E. Reimanis, Keith Rozenburg, Hans-Joachim Kleebe, and Ronald L. Cook "Fabrication of transparent spinel: the role of impurities", Proc. SPIE 5786, Window and Dome Technologies and Materials IX, (18 May 2005); https://doi.org/10.1117/12.604622

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