Structural features of 19Al2O3-19Fe2O3-62P2O5 glass from a theoretical and experimental point of view

Thermal properties of Na2O–P2O5–Fe2O3 polyphosphate glasses

“…Two bands about 1090 and 930 cm −1 are assigned to symmetric stretching vibrations of non-bridging oxygens in Q 1 and Q 0 , respectively. The bands in the range from 700 to 800 cm −1 are related to vibrations of P-O-P linkages [37][38][39]. The intensity of band related to Q 2 decreases, Q 0 increases, and Q 1 rather remains unchanged.…”

“…Furthermore, the band related to Q 1 structural unit moves toward lower values of Raman shift from 1070 to 1030 cm −1 . The band related to symmetric stretching vibrations of non-bridging oxygens in Q 1 connected to Fe should be about 1050-1140 cm −1 [14,38,39]. This shift can, therefore, be associated with a decrease in Q 1 -Fe connections.…”

Influence of the replacement of silica by boron trioxide on the properties of bioactive glass scaffolds

“…They can be assigned to vibrations of penta‐, tetra‐, and diborate groups as well as ring breathing vibrations of both BO 3 and BO 4 groups (Table 4). 76,77 Bands typical for Q 1 P and Q 0 P units are also visible 69,78,79 …”

“…However, the surface of the 13‐93‐based and 13‐93‐BS BG scaffold struts is seen to be smooth (according to higher magnification images), whereas the struts of 13‐93‐B BG scaffolds appear rougher. This is a sign that the BG particles in the case of silicate 13‐88 and borosilicate (13‐93‐BS) BGs are sintered together (via a viscous flow mechanism 54 ), which results in suitable densification. In contrast, the 13‐93‐B BG particles appear to be not (completely) fused together, resulting in a greater porosity of around 95%.…”

“…76,77 Bands typical for Q 1 P and Q 0 P units are also visible. 69,78,79 The 13-93-BS glass has a borate-silico-phosphate matrix and therefore its spectrum is very complex (Figure 5). Bands typical for borosilicate and borophosphate glasses are visible and summarized in Table 5.…”