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Molded Glass–Ceramics for Infrared Applications

Authors

  • Mathieu Rozé,

    Corresponding author
    1. Laboratory of Glasses and Ceramics, UMR CNRS 6226 “Sciences Chimiques de Rennes,” Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France
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    • Present address: Ph.D. student at the EcolePoytechnique of Montreal in the Complex Photonic Structures and Processes Group.

  • Laurent Calvez,

    1. Laboratory of Glasses and Ceramics, UMR CNRS 6226 “Sciences Chimiques de Rennes,” Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France
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  • Mathieu Hubert,

    1. Laboratory of Glasses and Ceramics, UMR CNRS 6226 “Sciences Chimiques de Rennes,” Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France
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  • Perrine Toupin,

    1. Laboratory of Glasses and Ceramics, UMR CNRS 6226 “Sciences Chimiques de Rennes,” Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France
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  • Bruno Bureau,

    1. Laboratory of Glasses and Ceramics, UMR CNRS 6226 “Sciences Chimiques de Rennes,” Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France
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  • Catherine Boussard-Plédel,

    1. Laboratory of Glasses and Ceramics, UMR CNRS 6226 “Sciences Chimiques de Rennes,” Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France
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  • Xiang-Hua Zhang

    1. Laboratory of Glasses and Ceramics, UMR CNRS 6226 “Sciences Chimiques de Rennes,” Université de Rennes I, Campus de Beaulieu, 35042 Rennes cedex, France
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  • This work has been supported by the French “Direction Générale pourl'Armement.”

*mathieuroze@gmail.com

Abstract

In this paper, the feasibility to make molded glass–ceramics transparent in the second and third atmospheric window has been investigated. The thermodynamical and viscosity properties of the base glass have been measured confirming the possibility of generating crystals during molding at different temperatures. 71Ga nuclear magnetic resonance confirms that gallium plays the role of nucleating agent of gallium in this glass. Examination of X-rays diffraction patterns and optical properties indicates that the generation of nanocrystals of GeGa4Se8 allows the glass–ceramics to keep a wide transparency in the infrared range from 2 to 15 μm. The crystallization of large GeSe2 crystals of at higher temperature induces scattering and a reduced transparency window. The mechanical and structural properties of the as-prepared glass ceramics show an increase of toughness from 0.188 to 0.387 MPa m1/2 and elastic modulus from 22.7 to 26.55 GPa while the number and size of crystals increase. As a result, the preparation of molded IR glass–ceramics with high resistance to thermal and mechanical shocks has been clearly demonstrated.

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