Elaboration and structural characterization of phosphate glasses with composition 37.5Na2O-25[(1-x)MgO-xNiO]-37.5P2O5 (0≤x≤1)

Phosphate glasses, with molar compositions 37.5Na 2 O-25[(1-x)MgO-xNiO]-37.5P 2 O 5 (0 ≤ x ≤ 1), have been prepared using the conventional melt quenching technique. The free nickel glass is colorless while the glasses containing nickel are yellow. The effect of Ni 2+ ions on structural and physico-chemical properties of these glasses has been investigated by XRD, DTA, EPR, Raman, FTIR spectroscopies and by density and chemical durability measurements. Substitution of Ni 2+ for Mg 2+ strengthens the glass network, as shown by the decrease of the molar volume, the increase of the glass transition temperature, and the improvement of the chemical durability. This behavior is a consequence of the replacement of Mg-O bonds by more covalent Ni-O bonds. The glass structure consists of tri-phosphate (P 3 O 10 ) 5- and di-phosphate (P 2 O 7 ) 4- groups, and Mg/NiO 6 octahedra, with Mg-O-P and Ni-O-P linkages.