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International audience; Phase transformation and nucleation-rate-like curve were firstly determined in chalcogenide glasses based on GeS2-Ga2S3-CsCl system, offering a controlled way to the transparent glass-ceramics with designed-in crystal phases and desired microstructure. The whole visible transparent glass of a composition of 25GeS2*35Ga2S3*40CsCl was specified for a demonstration of the controlled crystallization. The expected crystal phases (Ga2S3 crystals) with a very fine size of ~50 nm were achieved successfully, more impressively with a large crystallinity degree of > 80%. An IR-transmitting glass-ceramic with the well improved resistance to the environmental impact was also obtained after a heat-treatment at 350 oC for 30h. And the nonlinear evolution of the thermo-mechanical properties for the resultant glass-ceramics is elucidated by the structural investigation employing SEM, XRD, and NMR techniques. The corresponding results would have benefit for the optimization of designing transparent chalcogenide glass-ceramics with highly specialized properties for many potential new applications in IR spectral region.

Made available in DSpace on 2022-04-28T20:37:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-01-01 In this paper, the influence on optical properties of alkali halides such as CsCl in a covalent glassy matrix has been investigated. Chalcogenide glasses belonging to the (GeS2)-(Ga2S3)-CsCl system with high ratio of CsCl present an entire transparency in the visible range. These glasses maintain good transmission up to 12μm. Furthermore, the thermomechanical properties and the glass hygroscopicity have been investigated as function of the CsCl amount. This new generation of glasses presents a great interest for optical application. They could be used both for passive applications (multi-spectral imaging) and active applications for rare-earth doping due to their good transmission in the visible range, increasing optical pumping possibilities. UMR CNRS 6226 Sciences Chimiques de Rennes Equipe Verres et Céramiques Campus de Beaulieu, 263, Av. du général Leclere CS 74205, 35042 Rennes Cedex Laboratório dos Materiais Fotônicos Instituto de Química UNESP, C.P. 355, CEP 14801-970, Araraquara, SP Laboratório dos Materiais Fotônicos Instituto de Química UNESP, C.P. 355, CEP 14801-970, Araraquara, SP

International audience; In this paper, the introduction of silver by incorporation of AgI in the family of chalcogenide glasses transparent from the visible range to 16 µm has been reported. A large glass forming region belonging to the GeSe2-Ga2Se3-AgI and able to accept more than 50 mol. % of AgI was discovered. Pure glasses, slightly transparent in the visible range up to 16 µm have been synthesized. A systematic study of thermo-mechanical and optical properties was performed. The possibility of shaping and drawing these glasses give them a great interest in ion exchange experiments to achieve gradient of the refractive index.