Transparency through Structural Disorder: A New Concept for Innovative Transparent Ceramics

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• 作者：Kholoud Al Saghir ; S茅bastien Chenu ; Emmanuel Veron ; Franck Fayon ; Matthew Suchomel ; C茅cile Genevois ; Florence Porcher ; Guy Matzen ; Dominique Massiot ; Mathieu Allix
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：January 27, 2015
• 年：2015
• 卷：27
• 期：2
• 页码：508-514
• 全文大小：450K
• ISSN：1520-5002

文摘

Transparent polycrystalline ceramics present significant economical and functional advantages over single crystal materials for optical, communication, and laser technologies. To date, transparency in these ceramics is ensured either by an optical isotropy (i.e., cubic symmetry) or a nanometric crystallite size, and the main challenge remains to eliminate porosity through complex high pressure鈥揾igh temperature synthesis. Here we introduce a new concept to achieve ultimate transparency reaching the theoretical limit. We use a controlled degree of chemical disorder in the structure to obtain optical isotropy at the micrometer length scale. This approach can be applied in the case of anisotropic structures and micrometer scale crystal size ceramics. We thus report Sr_1+x/2Al_2+xSi_2鈥?i>xO₈ (0 < x 鈮?0.4) readily scalable polycrystalline ceramics elaborated by full and congruent crystallization from glass. These materials reach 90% transmittance. This innovative method should drive the development of new highly transparent materials with technologically relevant applications.