Formation and structure of ionic (Na, Zn) sulfophosphate glasses

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

“…The spectra have also exhibited three usual bands originated from borate groups in the regions 1381-1414 cm −1 due to BO 3 units, 944-964 cm −1 due to BO 4 units and 709-724 cm −1 due to bending vibrations of B O B linkages [22]. In the spectral regions 658-678 cm −1 and 1124-1148 cm −1 vibrational bands corresponding to bending and asymmetric modes of SO 4 2− groups, respectively are also observed [23,24]; additionally a prominent band in the regions 581-620 cm −1 attributed to the vibrations of TiO 6 structural units [25][26][27] is also located in these spectra. With the gradual introduction of TiO 2 in the glass network, all the asymmetrical bands are observed to grow at the expense of symmetrical bands.…”

“…During this process the sulfate units remain as terminal groups without any chemical interaction with the phosphate units [4]. As a consequence, variation in the density is hardly expected with the variation in the content of Na 2 SO 4 ; however, due to the formation of dithiophosphate (DTP) units (due to the weak interaction between pyrophosphates), a slight increase in the density is possible (Table 1).…”

“…These materials exhibit high electrical conductivity (purely ionic), compatible with the electrode materials and are thermally and chemically stable. The SO 4 2− ions largely dissolve in the phosphate glass matrix and mostly remain as isolated units [4]. However, there are also reports suggesting that sulfate ions and metaphosphate ions interact weakly and form a small dynamic concentration of dithiophosphate (DTP) units in the glass matrices [5].…”

Micromechanical properties of (Na,Zn)-sulfophosphate glasses

“…In this way, the glass forming region was extended to compositions with an average number of nonbridging oxygen per phosphate anion of more than 3.5 [10]. To control the hot forming processes connected with these potential applications a detailed study on melt rheology (T > T g ) was carried out, which show that the shift from PO 4 3− to SO 4 2− structural units decreases the kinetic fragility of the melts and results in gradually decreasing glass transition and softening point [10]. At the same time a sub-T g relaxation phenomena was evident and correlated to sulfate structural units decoupled from the phosphate network [11].…”

Effect of annealing temperatures on an ion transport properties of the bioglass

“…The 45S5 type bioglass is superior in charge storage performance by the electrical polarization [12]. Ion transport studies in Na + containing phosphate glasses have been mostly studied for the purpose of electrolyte applications [13][14][15][16][17].…”