Investigation of the solubility and ion release in the glass system K2O-Na2O-CaO-P2O5

Glasses from the quaternary glass system K(2)O-Na(2)O-CaO-P(2)O(5) were produced by standard glass forming techniques. The compositions were limited by fixing the P(2)O(5) at 45mol%, fixing the CaO content at either 20,24 or 28 mol%. The K(2)O and Na(2)O made up the residual varying from 0 to 25 mol % K(2)O. General trends showed that with increasing CaO content, the glasses showed a decrease in solubility as expected. For a single system of fixed CaO content, with increasing K(2)O content, there was an increase in solubility. This was seen at all three CaO contents. All the glasses showed an initial increase in pH followed by a gradual decrease with time and this was accounted for by the initial release of Na(+) ions into solution. For the ion release curves, for all fixed CaO contents, the glass with 0mol% K(2)O showed the lowest Ca(2+) release. This was accounted for as being due to the low solubility compared to the K(2)O containing glasses. The Na(+) release appeared anomalous, as it was higher than all the K(2)O containing glasses. Even though the glasses with 0 mol% K(2)O showed the lowest solubility, the amount of Na(+) contained in the glass was high, hence the high levels of release. (C) 2001 Elsevier Science Ltd. All rights reserved.