Influence of MgO (CaO) on the structure of silicate-phosphate glasses Ta and NMR study

Thermal and structural properties of model silicate-phosphate glasses containing the different amounts of the glass network modifiers, i.e. Mg 21 and Ca 2+ were studied. To explain the changes of the parameters characterizing the glass transition effect (Tg, Acp) and the crystallization process (Tc,...

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Bibliographic Details
Published in:Journal of Thermal Analysis and Calorimetry 2006-04, Vol.84 (1), p.185-190
Main Authors: WACŁAWSKA, Irena, SZUMERA, M
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Chemical industry and chemicals
Exact sciences and technology
Glasses
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Summary:Thermal and structural properties of model silicate-phosphate glasses containing the different amounts of the glass network modifiers, i.e. Mg 21 and Ca 2+ were studied. To explain the changes of the parameters characterizing the glass transition effect (Tg, Acp) and the crystallization process (Tc, AH) depending on the cations modifiers additions, analysis of the bonds and chemical interactions of atoms in the structure of glasses was used. 31P MAS-NMR spectra of SiO2-P2O5-MgO(CaO)-K2O glasses show that the phosphate complexes are monoand diphosphate. It has been found that increasing amounts of Mg 2+ or Ca 2+ cations in the structure of glasses causes the reduction of the degree of polymerization of the phosphate framework (Q1- > Q0). The influence of increasing of modifiers in the structure of silicate-phosphate glasses on the number of non-bridging oxygens per SiO4 tetrahedron and density of glasses was presented.
ISSN:1388-6150
1572-8943
0368-4466
DOI:10.1007/s10973-005-7183-9