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- W2907437753 abstract "Commercial applications of phosphorus-bearing silicate glasses include optical communications systems and, particularly, bioceramics and bioglass technology. The wide range of uses of P-bearing glasses and melts reflects an unusually broad range of physicochemical properties as functions of chemical composition, which in turn govern their structural features. The structure of P-bearing silicate and aluminosilicate glasses and melts is characterized by phosphate complexes that can be either isolated or linked to the silicate network via POSi and POAl bridges. The abundance of phosphate complexes incorporating POAl and POSi bridges increases with the degree of polymerization. Thus, the more polymerized a silicate melt, the less pronounced is the depolymerizing effect of dissolved phosphorus. The polymerizing effect of dissolved phosphorus also is greater when isolated phosphate complexes are either abundant or more depolymerized. Equilibria between phosphate and silicate complexes depend slightly on temperature so that most silicate and aluminosilicate melts should become more depolymerized as the temperature is increased. The complicated composition dependence of the physicochemical properties of P-bearing melts reflects the complicated relationships between phosphate and silicate complexes. For example, solution of P2O5 affects composition-activity relations such that the activity coefficient of SiO2 increases significantly with increasing P2O5 concentration, thus affecting melt and crystallization behavior, and often also promotes liquid immiscibility in silicate melts. Physical properties such as melt viscosity and diffiusion also are functions of the silicate composition-dependent solubility mechanisms. In depolymerized silicate melts, dissolved P2O5 results in increased melt viscosity and decreased diffusivity, whereas the opposite trends can be observed in highly polymerized silicate systems. Similarly, volume, compressibility, and thermal expansion of silicate melts vary with P2O5 content in a manner that is governed by the silicate polymerization." @default.
- W2907437753 created "2019-01-11" @default.
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- W2907437753 date "2019-01-01" @default.
- W2907437753 modified "2023-09-26" @default.
- W2907437753 title "Phosphorus in Silicate Systems" @default.
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- W2907437753 doi "https://doi.org/10.1016/b978-0-444-63708-6.00013-2" @default.
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