Structure and electrical conductivity of glasses in the Na2O-Na2SO4-P2O5 system

Dielectric dispersion and spectroscopic investigations on Na2SO4–B2O3–P2O5 glasses mixed with low concentrations of TiO2

“…Such weak and variable interaction between these two ions is expected to influence the electrical properties to a large extent. A considerable number of previous studies on a variety of physical properties of different alkali sulfophosphate glasses are available in the literature [6][7][8][9]. The introduction of B 2 O 3 to alkali sulfophosphate glasses is expected to increase the thermal stability of the glass network (since borate groups form M + [BO 4 ] − pairs) and also reported to increase the electrical conductivity [10][11][12][13].…”

“…Normally, the ions of titanium exist in the glass in Ti 4+ state and participate in the glass network forming with TiO 4 , TiO 6 and some times with TiO 5 (comprising of trigonal bipyramids) structural units [14,17]. However, there are also reports suggesting that these ions may also exist in Ti 3+ valence state in some of the glass matrices and acts as modifiers [17,18]; such variation in the coordination and valence of titanium ions are expected to cause the structural modifications and local field variations in the glass network and expected to influence the electrical properties to a large extent.…”

Optimization of electrical conductivity in the Na2O‐P2O5‐AlF3‐SO3 glass system

“…When metal oxides (Me 2 O) are introduced into the pure Q 3 phosphate network, they cleave P-O-P linkages to form polar bonds of the type P-O-Me + , ie, nonbridging oxygens (NBOs), in the glass bulk. 18 Since sodium interacts with the glass network mostly through ionic bonding, we can deduce that as [Na + ] and [NBOs] increase, the electrical conductivity becomes higher. Nonetheless, the relationship between conductivity and Na + content is nonlinear as variations in free volume and the ionic bonding of the NBOs can also restrain the movement of the Na + ions as compared to a glass network with lower sodium E B (and the same [Na + ]).…”

Structural and physical properties of $$\hbox {Sm}^{3+}$$ Sm 3 + doped magnesium zinc sulfophosphate glass

“…The optical bandgap energy (E opt ) for both direct (E dir opt ) and indirect (E indir opt ) transitions are calculated using the UV absorption edge of the UV-Vis-NIR spectra via Tauc's plot. The absorption coefficient (α (v)) as a function of photon energy (hv) is expressed in the equation (10) as [26]:…”

“…The IR spectra of the Li 2 SO 4 -LiPO 3 glass system demonstrated that the sulfate ions can be incorporated into the polyphosphate structural fragments to form the mixed sulfate phosphate network [9]. Sokolov et al [10] investigated the IR spectra of Na 2 O-Na 2 SO 4 -P 2 O 5 glass systems in which the observed band, around 620 cm −1 , is assigned to the presence of SO 2− 4 in the glass network. Furthermore, the appearance of bands at 1170, 1130 and 640 cm −1 are attributed to the stretching and bending vibrations of S-O of sulfate structural fragments, indicating the formation of sulfate phosphate structure.…”