Synthesis and characterization of glass -ceramic materials for optical applications
Item
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Title
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Synthesis and characterization of glass -ceramic materials for optical applications
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Identifier
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d_2009_2013:f97a128d0fa0:10280
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identifier
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10261
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Creator
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Popov, Ivan,
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Contributor
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Leslie L. Isaacs | Vladimir Petricevic
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Date
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2009
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Language
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English
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Publisher
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City University of New York.
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Subject
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Chemical engineering | Materials science
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Abstract
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Porous glass impregnation with Cr-doped olivine nano-crystallites, and synthesis and devitrification behavior of Cr-doped CaO--GeO 2--Li2O--B2O3(Al2O 3) 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 mum. Glass-ceramic samples exhibit broad-band emission in the 1050-1600 nm spectral range, 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 Cr 4+:Ca2GeO4 with increased lattice parameters. Nucleation and crystallization kinetics of Cr-doped CaO--GeO2--Li 2O--B2O3(Al2O3) glasses were investigated. Activation energies were 530 KJ/mol for nucleation and 415KJ/mol for crystallization. The Avrami coefficient was found to be 3.7, suggesting 3-dimensional bulk crystallization within the glass.
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Type
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dissertation
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Source
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2009_2013.csv
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degree
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Ph.D.
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Program
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Engineering
