Effect of P2O5 content in two series of soda lime phosphosilicate glasses on structure and properties – Part I: NMR

The effect of phosphate content on the bioactivity of soda-lime-phosphosilicate glasses

“…The processing of these glasses have been previously reported [5,6]. Compositions can be found in table (1) also with network connectivity values assuming phosphate enters the glass network (NC) and that a separate orthophosphate phase is formed (NC').…”

“…This study reports the bioactivity of two series of glasses of which structure and properties have been previously reported [5,6]. In series I phosphate was added to the glass, replacing SiO 2 and the Ca to Na ratio was kept constant.…”

Bioactive glass engineered coatings for Ti6Al4V alloys: Influence of strontium substitution for calcium on sintering behaviour

“…They have also looked at the structural role of phosphate and found evidence for glasses with greater than 5 mol% P 2 O 5 exhibiting amorphous phase separation into a silica rich and phosphate rich phase [15]. This was confirmed by solid-state 31 P nuclear magnetic resonance (NMR) experiments, which showed an orthophosphate phase for all phosphate contents when NC<2.5 [10,11,16].…”

“…The network connectivity may be calculated according to Hill [7], but it is now recognised that phosphate in bioactive glasses does not form part of the silicate network [10,11] and is thought to exist as a distinct orthophosphate droplet phase [12], and due allowance must be made for this in the calculation of NC as well as in the calculation of the TEC. We assume that by analogy with sodium borosilicate glasses of low borate content, such as Pyrex™, the TEC of the glass is determined solely by the matrix silicate phase.…”

Rare-Earth Recovery from Soda Lime Silicate Glass Cullet by P2O5 Addition

“…With phosphate addition, the glass cullet might experimentally approach a phosphosilicate glass system. We then exploited the chemical behavior of phosphate in the silicate network matrix, i.e., its high ionic field strength [12] to attract the rare-earth element, its tendency to form discrete anion complexes [13,14] to cluster the rare-earth element away from the silicate, and its low durability [15,16] to leach phosphate with rare-earth element using water. To study the effect of phosphate addition on rare-earth element, photoluminescence spectroscopy can be employed to record the emission spectra of the element, especially in glass samples lacking transparency.…”