Investigation of Sol-Gel Derived SiO2 -P2O5 - CaO- Na2O Bioactive Glass Using Various Precursors

In this research، sol-gel bioactive glass in SiO2 -P2O5 – CaO - Na2O system using common nitrate precursors was investigated. Some parameters like water/alcohol/TEOS ratio، type of catalyst (acid or alkali) and temperature of heat treatment were also studied. Various precursors such as acetates، carbonates and chlorides were utilized to introduce Ca and Na in glass composition. Characterization of crystallization temperature، created phases and chemical groups in synthesis powder was accomplished by STA، XRD and FTIR analyses. Although above-mentioned parameters influence on final powder characteristics، their changes cannot induce amorphous phase development in composition with high amount of Na2O and sodium nitrate is always observed in their XRD patterns. Results indicated that by decreasing Na2O from 24. 4 %mol. to 13. 7 %mol. in glass composition، amorphous phase could be achieved.