Structural investigations of sodium diborate glasses containing PbO, Bi2O3 and TeO2: Elastic property measurements and spectroscopic studies

The role of lead oxide on structural and physical properties of lithium diborate glasses

“…It shows that the values of glass transition temperature (T g ) decrease gradually as the lead oxide content increased. There is an initial change in (T g ) at about 10 mol% Pb 3 O 4 , which reveals initial breaking down of the diborate structure when the major part of lead content acts as a modifier [17]. This is followed by a gradually decreasing the values of (T g ) in the region 70 P PbO > 10 where new boro-plumbate structure evolves [17].…”

“…There is an initial change in (T g ) at about 10 mol% Pb 3 O 4 , which reveals initial breaking down of the diborate structure when the major part of lead content acts as a modifier [17]. This is followed by a gradually decreasing the values of (T g ) in the region 70 P PbO > 10 where new boro-plumbate structure evolves [17]. The values of (T g ) are quantitatively described in terms of two effects: 1-increasing the values of (T g ), creation of 4-coordinated boron (BO 4 units).…”

“…A broad absorption band at 1585-1150 cm À1 range, attributed to the stretching vibration of B-O bonds in borate triangular (BO 3 ) units [17,25]. BO 3 units for the diborate composition should be neutral and charged metaborate triangles, BØ 3 , BØ 2 O À , respec- tively (where Ø representing an oxygen atom bridging two boron atoms) [26][27][28].…”

“…Also the [BO 3 ] stretching absorption peak is split, indicating the presence of both BØ 3 and BØ 2 O À boron's [17,27]. The absorption band at 1150 cm À1 shifts to 1101 cm À1 and the band at 1035 cm À1 shift to 1008 cm À1 accompanied by a decrease in the intensity and increase in broadening which attributed to formation of tetrahedral [BØ 4 À ] units [26].…”

An optical and structural investigation into CdTe nanocrystals embedded into the tellurium lithium borophosphate glass matrix

“…The observed infrared bands for the doped and undoped glass samples are shown in Figure 3, and the peak assignments are given in Table 2 ν (Te-O-Te) bending modes in TeO 4 groups [16] ν (B-O-B) bending modes [17] Deformation mode of P-O − groups [18] ν (TeO 4 ) [19,20] ν (TeO 3 ) [21] ν (TeO 2 ) [22,23] νs(POP) [24] νas(POP) [24] v (BO 4 ) [25] νs (PO 3 ) (chain end groups) [26] and ν (P-O-) stretching modes [27][28][29] v (BO 4 ) [30] νas (PO 3 ) [26] Ionic B-O stretching νas(PO 2 ) ν(P=O)in and νas(PO 2 ) in [24] ν(P=O) and (v (BO3) (v (BO 3 ) [31,32] modified with doping by CdTe nanoparticles. In addition, the appearance of the (v P==O) and (v (BO 3 ) bands may indicate the absence of a cyclic structure in the glass, which is due to the growth of nanoparticles.…”