Infrared glass ceramics transmitting light from 2 to 15 mum have been produced from a Ga-Ge-Sb-Se glass. The glass composition is selected in the middle of the glass forming region and the annealing temperature must be close to T-g to avoid excessive crystal growth. A heating time of the order of two weeks is necessary to see evolution of the thermal expansion coefficient of the composite while keeping the optical transmission properties of the glass. (C) 2003 Elsevier Science B.V. All rights reserved. [References: 6]
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