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Molded Glass–Ceramics for Infrared Applications
Author(s) -
Rozé Mathieu,
Calvez Laurent,
Hubert Mathieu,
Toupin Perrine,
Bureau Bruno,
BoussardPlédel Catherine,
Zhang XiangHua
Publication year - 2011
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/j.2041-1294.2011.00037.x
Subject(s) - materials science , ceramic , composite material , crystallization , infrared , glass ceramic , diffraction , optics , chemical engineering , physics , engineering
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. 71 Ga 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 GeGa 4 Se 8 allows the glass–ceramics to keep a wide transparency in the infrared range from 2 to 15 μm. The crystallization of large GeSe 2 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 m 1/2 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.