Effects of magnesium for calcium substitution in P2O5–CaO–TiO2 glasses

摘要: Abstract Many phosphate glasses dissolve in aqueous solutions, and they are increasingly studied for use as degradable biomaterials. As magnesium has been suggested to improve glass formation glasses, its effect on structure, thermal properties dissolution were studied. Two series (one the metaphosphate range with 50 mol.% P2O5 one invert 30 mol.% P2O5) system P2O5-CaO-TiO2, where calcium was partially (0 100% a molar base) replaced by magnesium, produced melt-quench route. Substitution of reduced density (owing lower atomic weight compared calcium), made network more compact, caused Raman bands shift higher frequencies. Magnesium substitution significantly improved processing both widening window. The solubility low shown negligible pH changes ionic concentrations, less than 7.5% ions being released over 1 week. There no significant differences two series, which is surprising generally considered be soluble glasses. had marked influence dissolution, increasing about three-fold calcium-containing while such observed Results suggest that affects differently, but improves both.