Physical properties of alkaline-earth and alkali borate glasses prepared over an extended range of compositions

Structure–property correlations in lead borate and borosilicate glasses doped with aluminum oxide

“…The increase in N 4 for the first three samples -which would be expected to raise the T g -is more than offset by this depolymerization effect. The reported increase in T g over the PbO content range of 20-27.5 mol% [45], is probably because N 4 temperature around alkali oxide concentration of about 27 mol% [46,47]. This correlates well with NMR studies performed at higher alkali oxide loadings where NBO units start to form above this 27-33 mol% regime [48].…”

Structural, thermal and optical properties of CaBO and CaLiBO glasses doped with Eu3+

“…To avoid liquid-liquid phase separation in the preparation of binary CaO-B 2 O 3 glasses high temperatures are required in order to obtain a homogeneous melt [5,14,15]. In this work, the addition of 10 mol% of Li 2 O to the CaB 4 O 7 glass composition prevents this liquid-liquid phase separation by allowing the preparation of glasses at much lower temperatures, as can be noted in MT values in Table 1.…”

Packing as a probe of structure in alkaline earth glass systems

“…The calculation of pf begins with the volume of a formula unit of glass, V f , which is given by the ratio of the mass per mole glass to the density of the composition given in [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The pf is then determined by…”