Synthesis and characterization of Cr4+-doped CaO–GeO2–Li2O–B2O3(Al2O3) transparent glass-ceramics |
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| Institution: | 1. Institute for Ultrafast Spectroscopy and Lasers, Center for Ultrafast Photonics, New York State Center for Advance Technology, Departments of Physics, The City College and the Graduate School of The City University of New York, New York, NY 10031, USA;2. Department of Chemical Engineering, The City College and the Graduate School of the City University of New York, New York, NY 10031, USA;3. Department of Earth and Atmospheric Science, The City College and the Graduate School of the City University of New York, New York, NY 10031, USA |
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| Abstract: | Synthesis and devitrification behavior of Cr-doped CaO–GeO2–Li2O–B2O3(Al2O3) glasses have been studied. A range of glass compositions was found to yield transparent glass-ceramics after devitrification. The size of crystallites is below 1 μm. Glass-ceramic samples exhibit 1050–1600 nm broad-band emission with a maximum around 1260 nm, very similar to the emission of Cr4+:Ca2GeO4 bulk crystals. X-ray diffraction measurements indicate that the structure of crystallites exhibiting near infrared emission in glass-ceramics may be assigned to Cr4+:Ca2GeO4 with increased lattice parameters. |
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