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Bulk nucleation and crystal growth in calcium tetra and digermanate glasses

Calcium tetragermanate and calcium digermanate glasses were prepared and studied with the aid of differential thermal analysis, X-ray diffraction and FTIR spectroscopy. The molar ratio of GeO 6 GeO 4 groups increases with the CaO GeO 2 molar ratio. A two steps crystallisation process was found: init...

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Published in:Journal of the European Ceramic Society 1998, Vol.18 (11), p.1587-1591
Main Authors: Catauro, M., Laudisio, G.
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Language:English
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description Calcium tetragermanate and calcium digermanate glasses were prepared and studied with the aid of differential thermal analysis, X-ray diffraction and FTIR spectroscopy. The molar ratio of GeO 6 GeO 4 groups increases with the CaO GeO 2 molar ratio. A two steps crystallisation process was found: initially microcrystals are formed that at higher temperatures are transformed in well shaped crystals. An unidentified phase crystallises in both glasses. CaGe 2O 5 crystals also grow in calcium digermanate glass. The influence of the specific surface area of the glass sample and of a heat treatment of nucleation was pointed out. The activation energy for crystal growth in each glass was evaluated by a non isothermal method.
doi_str_mv 10.1016/S0955-2219(98)00079-X
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ispartof Journal of the European Ceramic Society, 1998, Vol.18 (11), p.1587-1591
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subjects Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Growth from solid phases (including multiphase diffusion and recrystallization)
Materials science
Methods of crystal growth
physics of crystal growth
Physics
title Bulk nucleation and crystal growth in calcium tetra and digermanate glasses
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