Structural studies on boroaluminosilicate glasses

Boroaluminosilicate glasses as ion exchange materials

“…9) of the dye incorporated glass with B 2 O 3 to Na 2 O ratio of 0.23 is characterized by mainly four peaks, around 3500 cm −1 , 2900 cm −1 , 1050 cm −1 and 440 cm −1 . Based on the previous studies [17,18], the peak at 3500 cm −1 is …”

“…The pattern corresponding to the glass sample with B 2 O 3 to Na 2 O ratio of 0.23 contains only one sharp peak around −22 ppm, characteristic of the tetrahedrally coordinated boron, (BO 4 ) − structural units whereas for the sample with B 2 O 3 to Na 2 O ratio of 4.4, in addition to the sharp peak at −22 ppm, a broad peak characteristic of trigonally coordinated boron (BO 3 ) structural units as symmetrically placed shoulders on both sides of the sharp peak is also observed. For a quadrupolar nuclei like 11 B (I = 3/2), the quadrupolar interaction get significantly reduced when it occupies the cubic tetrahedral environment, resulting in the appearance of a sharp peak in the 11 B MAS NMR patterns [17,18]. Unlike this for boron in trigonal environment (BO 3 structural units), due to the significant quadrupolar interaction, a broad line shape is observed.…”

“…For glass sample with B 2 O 3 to Na 2 O ratio of 0.23, 29 Si MAS NMR patterns shown in Fig. 6(a), revealed the existence of Q 3 and Q 4 silicon structural units in the ratio of 60:40 (where Q n represents silicon structural units having n number of bridging oxygen atoms [17,18]). However, with an increase in B 2 O 3 concentration, as in the sample with B 2 O 3 to Na 2 O ratio of 4.4, there is a significant increase in the Q 4 structural units at the expense of Q 3 structural units and the Q 3 : Q 4 ratio changes to 25:75 ( Fig.…”

Structural influence of PbO by means of FTIR and acoustics on calcium alumino-borosilicate glass system

“…It can be used as wall-covering panels, floors and roofs in building, interior facing of containers and as a road surfacing [9]. On the other hand, lead borosilicate glasses have some remarkable features such as its high chemically stability over a wide range of concentrations, possess low melting points, a desirable electrical resistivity, and are considered as a basis for the manufacture of various coatings, semiconductor microelectronics, optical lenses, enamels, solder glasses, glass-ceramic cements, and as hard nuclear waste materials [10][11][12][13].…”

Preparation and characterization of transition metal oxide doped borate glasses

“…UV/Visible absorption spectroscopy is the measurement of the attenuation of a beam of light after it passes through a sample or after reflection from a sample surface. Absorption measurements can be at a single wavelength or over an extended spectral range [12]. Oxide glasses are generally non-conductor of electricity that they act as insulators.…”