Effect of BaO addition on the structural aspects and thermophysical properties of sodium borosilicate glasses

Effect of barium on diffusion of sodium in borosilicate glass

“…The structural aspects of these glasses have been studied earlier by 29 Si, 11 B NMR and IR spectroscopy [12]. This study showed existence of Q 2 and Q 3 structural units of Si with no direct interaction between Ba 2+ and boron structural units.…”

Ionic transport behavior of BaO containing sodium borosilicate glasses

“…11 B MAS NMR patterns of all the samples are characterized by sharp peak superimposed over broad shoulders placed symmetrically on either side of the sharp peak. Sharp peak is attributed to the tetrahedrally coordinated boron (BO 4 structural units) and broad peak to the trigonally coordinated boron (BO 3 structural units) [6,7]. The line shape and peak position are identical for all the glass samples, indicating that the boron network is unaffected by the doping of BaO into the sodium borosilicate glass.…”

“…2A and B, respectively. The broad asymmetric peak 29 Si MAS NMR could be deconvoluted into two peaks with chemical shift values around −99 and −86 ppm which were attributed to Q 3 and Q 2 structural units of silicon, respectively [6,7]. With increase in BaO concentration in the glass, initially the relative concentration of Q 3 and Q 2 structural units remained same, however, after addition of more than 3.47 mol% BaO, the Q 2 concentration marginally increases at the expense of Q 3 structural units.…”

Photoacoustic spectroscopic and electron paramagnetic resonance investigations on copper doped alkali borosilicate glasses

“…The glass samples after annealing were cut into 2mm thick plates and polished on either side for further studies. PAS spectra in 250-900 nm range were recorded on an indigenously built PA spectrometer with a 450W tungsten-halogen lamp as the excitation source [5]. PA spectra were normalized for variations in the intensity of excitation source profile by normalization of sample spectra to that of a carbon spectrum.…”