Abstract
Currently, the solubility of phosphate glasses has been extensively studied for potential glass fertilizer. This work presents the study of 45P2O5-20CaO-xK2O-(29-x)Na2O-6Al2O3 glass, where x equals to 5, 10, 15 and 20 wt. % of K2O. Free bubble glasses were obtained at melting temperature of 1300 °C. Solubility study of phosphate glass indicates that the glass containing 15 wt. % of K2O released the highest amounts of PO43- ion and K+ ion and it exhibits the lowest pH value compare to other glasses. Spectroscopy analysis revealed the addition of K2O to the glass system contributed to the formation of metaphosphate and phyrophosphate units around 919 cm-1 and 1119 cm-1. The morphology analysis indicates the formation of pores on the glass surface was associated with the corrosion of the glass samples due to the immersion. The addition of K2O to the glass system has increased the glass solubility due to the breakup of the glass structure.
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