29Si MAS NMR and microhardness studies of some lead silicate glasses with and without modifiers

Structure and lattice dynamics of binary lead silicate glasses investigated by infrared spectroscopy

“…This peculiar value corresponds to the concentration at which connectivity of the three-dimensional silicate network disappears [16]. Ours results in agreement with the literature results [4,5] show that this value corresponds also to the vanishing of the amount of the Q 4 structural units (Fig. 10).…”

“…In order to understand why this system can form glasses in a very large range of composition by comparison to alkaline earth silicate glass systems [2,3], numerous studies have been reported. The local structures of these compounds have been widely investigated by NMR [4][5][6][7][8], X-ray spectroscopy [8][9][10][11][12][13][14][15][16] and molecular dynamics [16][17][18]. But, even if considerable efforts have been made to explain the composition dependence of the structure and the role played by lead, there is still not a complete consensus on the subject [16,14].…”

Thermoluminescence kinetic study of binary lead-silicate glasses

“…Detailed knowledge of the physical properties, particularly electronic, and internal structure of these glasses is critical if they are to be used in all-optical switches. The present study concerns glasses of the lead-silicate family, which have been the subject of several recent experimental and theoretical studies [1][2][3][4][5][6][7][8][9][10][11][12][13]. Previous studies have presented two differing views on the nature of the glass structure as a function of lead concentration.…”

Nuclear magnetic resonance studies of 0.139MO (or M′2O) · 0.673SiO2· (0.188−x)Al2O3·xB2O3 (M=Mg, Ca, Sr and Ba, M′=Na and K) glasses

“…This result suggested that Ca preferentially arranged in the vicinity of Q 2 species rather than Q 3 . In particular the structure of alkali ion-free glasses have recently been studied by numerous workers [6][7][8][9].…”