Structural and thermochemical properties of sodium magnesium phosphate glasses
作者： Refka Oueslati Omrani , Abdeltif Kaoutar , Abdelaziz El Jazouli , Saida Krimi , Ismail Khattech
DOI: 10.1016/J.JALLCOM.2015.01.297
关键词: Raman spectroscopy 、 Differential scanning calorimetry 、 Magnesium phosphate 、 Inorganic chemistry 、 Analytical chemistry 、 Magic angle spinning 、 Inductively coupled plasma atomic emission spectroscopy 、 Magnesium 、 Metaphosphate 、 Glass transition 、 Chemistry
摘要: Abstract Ternary phosphate based glasses with the general formula (50− x /2)Na 2 O– MgO–(50− /2)P O 5 (0 ⩽ ⩽ 42.8 mol%), where / 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 31 solid state magic angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopies, differential scanning calorimetry (DSC), inductively coupled plasma atomic emission spectroscopy (ICP/AES) analysis calorimetric dissolution. The depolymerization metaphosphate chains are described decrease Q tetrahedral sites allowing formation pyrophosphate groups ( 1 ) revealed spectroscopic investigations. As result, increase glass transition temperature when rises. Calorimetric study shows that dissolution phenomenon is endothermic for lower MgO content becomes exothermic magnesium oxide gradually incorporated, suggesting disruption increasing ratio.
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