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Meeting Materials Science & Technology 2019
Symposium Ceramic and Crystal Materials for Optics and Photonics
Presentation Title Grain Size Dependent Properties Trends in Nanocrystalline Ceramics for Optical Applications
Author(s) James A. Wollmershauser, Boris N Feigelson, Kevin P Anderson, John W Drazin, Mason A Wolak, Heonjune Ryou, Edward P Gorzkowski
On-Site Speaker (Planned) James A. Wollmershauser
Abstract Scope It is well known that reducing the grain size of polycrystalline ceramics can increase the strength and hardness of ceramics, as well as, enhance light transmission in birefringent ceramics when the grain size becomes smaller than the optical wavelength of interest. However, only a limited amount of experimental work currently exists which demonstrates dense nanocrystalline ceramics with grain sizes under 100nm with porosity levels required for optical applications, i.e. < 0.01%. This talk will focus on some of NRL’s work on synthesis and properties of nanocrystalline ceramics with grain sizes much smaller than 100 nm and negligible porosity. As the grain size is reduced well below 50 nm, traditional descriptions of bulk behaviors in polycrystalline materials appear to break down and new mechanisms are needed to explain the grain size dependent mechanical behavior and optical scattering phenomena.


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