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2015
ACL
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K.Al Saghir, S.Chenu, E.Véron, F.Fayon, M.Suchomel, C.Genevois, F.Porcher, G.Matzen, D.Massiot, M.Allix, 'Transparency Through Structural Disorder: A New Concept for Innovative Transparent Ceramics.', Chem. Mat. 27 508 (2015) doi:10.1002/chin.201513010
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−high 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 Sr1+x/2Al2+xSi2−xO8 (0 < x ≤ 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.
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