Thermal and structural studies of Li2O‐Na2O‐SrO‐TiO2‐B2O3‐P2O5 glasses by DTA, IR and EPR spectroscopy

Glasses in molar fraction in the system 33.33[xNa2O‐(1‐x)Li2O]‐2.5SrO‐2.5TiO2‐45B2O3‐16.67P2O5 (0.0 ≤ x ≤ 1.0) were prepared by standard melt quenching procedures, their physical properties were characterized by thermal analysis and density measurements. Their local structures were comprehensively c...

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Bibliographic Details
Published inJournal of Applied Surfaces and Interfaces Vol. 1; no. 1-3; pp. 57 - 63
Main Authors H. Bih, H. Sinouh, H. Es‐soufi, L. Bih, M. Haddad, L. Bejjit, B. Manoun, P. Lazor
Format Journal Article
LanguageEnglish
Published Faculté Polydisciplinaire de Khouribga 01.08.2017
Subjects
Borophosphate Glasses
EPR
Mixed Alkali Effect (MAE)
Thermal Analysis
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Summary:Glasses in molar fraction in the system 33.33[xNa2O‐(1‐x)Li2O]‐2.5SrO‐2.5TiO2‐45B2O3‐16.67P2O5 (0.0 ≤ x ≤ 1.0) were prepared by standard melt quenching procedures, their physical properties were characterized by thermal analysis and density measurements. Their local structures were comprehensively characterized by Infrared spectroscopy (IR) and electron paramagnetic resonance (EPR). The variation of the glass transition temperature as a function of the glass compositions is non‐linear. The infrared spectroscopy of the glasses has identified the presence of different structural grouping units in the glassy‐matrix. It is found that the stretching and bending vibration modes of borate groups are more sensitive to the substitution of alkali elements. EPR experiments have shown the presence of Ti3+ centers in the glasses. The variation of the g‐factor as a function of the Na/(Na+Li) ratio presents a minimum around (x=0.5). The composition nonlinearity behavior of Tg, vibration bending mode, and g‐factor are signature of the mixed alkali effect in the glasses.
ISSN:2550-4800