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Please use this identifier to cite or link to this item: http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/313

Titre: Effect of isothermal heat treatment time on structural transformation and crystallization of B2O3-PbO glass
Auteur(s): Aboutaleb, Djamila
Iratni, A.
Safi, B.
Mots-clés: Lead borate glasses
Phase separation
Ostwald ripen
Structural configuration
Issue Date: 2008
Collection/Numéro: Matériaux & Techniques / Vol.96, N°4-5 (2008);pp. 181-187
Résumé: Lead borate glass was prepared by the quench method, followed by treatment at its isothermal temperature at different time periods. When the sample was rapidly cooled from the melt, it showed two distinguished opalescent layers. The SEM analysis and XRD pattern provide characteristics of glass without XRD peaks and their morphology show the aggregated spherical particles in the phase separated glass. This data show that phase separation occurred even when the melts were rapidly cooled, however, the sample shows a Ostwald ripen with increasing time of heat treatment, which implies that the size of particles increases and their number decreases. When changing the sample's composition by adding lead oxide (PbO), the sample crystallizes directly upon heat treatment. The infrared absorption spectra show shift edge for sample glass with heat treatment, which indicates a change of structural configuration, i.e. conversion of tetrahedral boron on triangular boron coordination
URI: http://dlibrary.univ-boumerdes.dz:8080/jspui/handle/123456789/313
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