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

Abstract

<jats:p>Phosphate glasses, with molar compositions 37.5Na2O-25[(1-x)MgO-xNiO]-37.5P2O5 (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 Ni2+ 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 Ni2+ for Mg2+ 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 (P3O10) 5- and di-phosphate (P2O7) 4- groups, and Mg/NiO6 octahedra, with Mg-O-P and Ni-O-P linkages.</jats:p>

Asymmetrical Supercapacitor Fabricated Using Sodium Nickel Phosphate and Transition Metal-Carbon Nitride Nanocomposite as Electrodes

“…As revealed in Figure A, the peak at 1647 cm –1 is due to the H–O–H bending of water. PO stretching is observed at 1300–1140 cm –1 , and 1140 and 1248 cm –1 are correlated to symmetric and asymmetric stretching in PO 2 in the phosphate tetrahedron . The peak at 1116 cm –1 is owing to the asymmetric stretching of PO 4.…”

“…Asymmetric stretching of the P–O–P bonds is detected at 905 cm –1 . M–OH absorbs in the regime 700–500 cm –1 , and the peak at 573 cm –1 can be correlated to the bending of Ni–O–H and due to the asymmetric bending vibration of PO 4 . − …”

“…P�O stretching is observed at 1300−1140 cm −1 , and 1140 and 1248 cm −1 are correlated to symmetric and asymmetric stretching in PO 2 in the phosphate tetrahedron. 21 The peak at 1116 cm −1 is owing to the asymmetric stretching of PO 4. Energy & Fuels Figure 3C−F shows the XPS spectra, and Figure S4 exhibits the wide scan spectrum.…”

“…The peak at 1116 cm –1 is owing to the asymmetric stretching of PO 4. − Vibrational bands of PO 4 3– are observed around 1093, 1026, and 994 cm –1 , corresponding to tetrahedral stretching vibrations. Asymmetric stretching of the P–O–P bonds is detected at 905 cm –1 .…”