Influence of barium oxide on glass-forming ability and glass stability of the tellurite–phosphate oxide glasses

Abstract

The effect of BaO content on the glass-forming ability, glass stability and structure of tellurite-phosphate oxide glasses in the 70TeO 2-10P 2 O 5-(20-x)ZnO-xBaO (x = 0, 5 and 10 mol%) system has been discussed. From the differential scanning calorimetry, the glass transition (Tg), crystallization (Tc) and the melting (Tm) temperatures were estimated. The decrease in reduced glass transition temperature (Tr g) and glass-forming tendency parameter (K h (Tc 1)) with addition and increasing BaO caused a decrease in the glass-forming ability of glasses. It was also found that the thermal stability of these glasses against crystallization decreased with increase in BaO concentration into chemical composition of base glass, i.e., glass without barium oxide. The FTIR spectra were measured to understand the structure of the obtained tellurite-phosphate oxide glasses. The results have shown that phosphorous and tellurium ions were taken part in the formation of the glass network of the studied glasses. The addition of BaO caused significant changes in the FTIR spectra of glasses. More and more TeO 3 and TeO 3?d units and PO 4 2groups (Q 1 units) were created when the BaO was added into the chemical composition of the base glass. Increasing barium ions content into the chemical composition of glasses caused depolymerization of the tellurite-phosphate oxide glass network. Keywords Tellurite-phosphate oxide glasses Á BaO Á Glass-forming stability Á Glass stability Á Structure

BaO-doped silicate and borosilicate glasses for enhanced chemical durability: molecular dynamics simulations based strategy for glass design

“…Also, Aboutaleb et al 56 reported increasing T g with BaO doping in binary BaO–B 2 O 3 glasses. On the other hand, the present studies demonstrate the reducing T g with increasing BaO content for both the binary BaO–SiO 2 as well as quaternary Ba-NBS glasses, which is in good agreement with the earlier studies of Lesniak et al 54 Thus, the present results show that the addition of BaO in the glass matrix would facilitate the easier fabrication of glass by reducing the glass transition temperature.…”

“…Notably, here, the oxygen atoms connected to either of Si/B on both the ends were considered as BO. The increasing NBOs with BaO doping suggest that Ba will break the random network of glass, similar as shown by the studies of Lesniak et al 54 In particular, small field strength and large ionic radius of barium ions result in a network modifier behavior; 56 therefore, the NBO fraction of the glass structure is increased with BaO doping. Further, for a similar concentration of BaO, the NBOs were detected to be higher for Ba-NBS (BS10) than BaO-SiO 2 (B10) due to the higher concentration of network modifiers (Na 2 O + BaO) for B10 than BS10.…”

“…39 Considering the numerous applications of BaO-doped silicate glasses, it is essential to explore the effect of BaO doping in these glasses. Though extensive research has been focused on the structural aspects of borosilicate glasses using MAS-NMR, IR, and Raman spectroscopic studies, [40][41][42][43][44][45][46][47][48][49][50] only few experimental 21,29,[51][52][53][54][55][56] and simulation studies 57,58 have made pioneering contribution in the direction of BaO-doped glasses. Also, the available literature is quite scattered and further studies are needed to approach the appropriate conclusions.…”

Spectroscopic Properties of Erbium-Doped Oxyfluoride Phospho-Tellurite Glass and Transparent Glass-Ceramic Containing BaF2 Nanocrystals

“…Figure 3 shows the normalized to the band at ~1030 cm −1 FTIR spectra (in the 1300–500 cm −1 range) of the precursor oxyfluoride phospho-tellurite glass with varying ErF 3 concentrations. As shown in Figure 3, all spectra presented the typical bands characteristic for tellurite glasses, i.e., at 610, 710, 770 cm −1 [58,59,60] and phosphate glasses, i.e., the bands at 500 cm −1 and in the 1300–900 cm −1 range [61,62,63,64,65,66,67].…”

Influence of Oxide Glass Modifiers on the Structural and Spectroscopic Properties of Phosphate Glasses for Visible and Near-Infrared Photonic Applications

“…Particularly noteworthy are the glass modifiers such as alkaline earth metal oxides (MO = MgO, CaO, SrO, BaO) that strongly influence the properties of glass systems [ 11 , 12 , 13 , 14 ]. Previously published results indicate that the depolymerization of the glass network due to the incorporation of alkaline earth oxides into the glass matrix promotes the formation of non-bridging oxygen (NBO) groups [ 15 ]. Moreover, Pavić et al [ 16 ] stated that modifiers like MgO, CaO as well as BaO influence some properties (electrical, dielectric and spectroscopic) of Fe 2 O 3 doped into phosphate glasses.…”