Phase separation and physical properties of sodium borosilicate glasses with intermediate silica content

Abstract

Microstructures of sodium borosilicate glasses with intermediate silica content, doped with CuO, were examined. Electron micrographs of heat-treated glasses show two randomly distributed phases. DC conductivity measurements indicate that alkali oxide is associated with B2O3. CuO is assumed to act as a network modifier in the borate matrix and does not affect the phase separation process. Optical absorption in the UV and visible regions was also examined. Phase separation causes a shift of the UV edge towards longer wavelengths, which is considered to be a result of light scattering on SiO2-rich particles produced by heat treatment.

FTIR structural investigation of gamma irradiated BaO–Na2O–B2O3–SiO2 glasses

“…1 shows the FTIR spectra of the base ternary Na 2 O-B 2 O 3 -SiO 2 glass system. The first absorption region shows small absorption bands at 440 and 530 cm À 1 .The band at 440 cm À 1 has been reported to exist in B 2 O 3 -SiO 2 , alumino borosilicate glasses and in sodium borosilicate as well [28]. It was assumed that this band is related to Si-O-Si and O-Si-O bending modes of bridging oxygens overlapped with B-O-B bending modes.…”

FTIR Spectroscopy and Structure of the Binary Glass Cu2O – MoO3 System

“…The effect of Cu2+ on the phase separation has been reported [11] for the glass Na2 O -B2 O3 -SiO2 system and it was found that Cu2O took part as a network former. There was no tendency for Cuo or Cu2+ to be formed and conductivity occurred only by Cu+ ions [5,10]The optical absorption properties of Cu: (Ar) 3d10 4s1 and Mo: (Kr) 4d5 5s1 are immensely important since they are the coloring agents in the oxide glasses.…”

“…The cuprous Cu+ ion does not produce coloring whilst Cu2+ ions create color centers with an absorption band in the visible, thus producing blue and green glasses. This absorption band is at or near 12500 cm-1 (800nm) and occurs in alkali silicate and borate glasses [11,12].…”

Molecular dynamics study of acoustic velocity in silicate glass under irradiation

“…14). The drop in the mean B coordination number has an effect, since the [3] B-O distances are shorter than the [4] [25,26] species in borate glasses.…”