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Structural and thermochemical properties of sodium magnesium phosphate glasses
Language
en
Article de revue
This item was published in
Journal of Alloys and Compounds. 2015, vol. 632, p. 766-771
Elsevier
English Abstract
Ternary phosphate based glasses with the general formula (50−x/2)Na2O–xMgO–(50−x/2)P2O5 (0 ⩽ x ⩽ 42.8 mol%), where the O/P ratio was varied from 3 to 3.75, have been prepared using a conventional melt quenching technique. ...Read more >
Ternary phosphate based glasses with the general formula (50−x/2)Na2O–xMgO–(50−x/2)P2O5 (0 ⩽ x ⩽ 42.8 mol%), where the O/P ratio was varied from 3 to 3.75, have been prepared using a conventional melt quenching technique. Samples were investigated by means of density measurements, Fourier-transformed infrared (FTIR), Raman and 31P solid state magic angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopies, differential scanning calorimetry (DSC), inductively coupled plasma atomic emission spectroscopy (ICP/AES) analysis and calorimetric dissolution.The depolymerization of metaphosphate chains are described by the decrease of Q2 tetrahedral sites allowing the formation of pyrophosphate groups (Q1) revealed by spectroscopic investigations. As a result, the increase of density and glass transition temperature when x rises. Calorimetric study shows that the dissolution phenomenon is endothermic for a lower MgO content and becomes exothermic when magnesium oxide is gradually incorporated, suggesting the disruption of phosphate chains with increasing O/P ratio.Read less <
English Keywords
Magnesium phosphate glasses
Calorimetric dissolution
Depolymerization
Metaphosphate glasses
Pyrophosphate groups
Origin
Hal imported