Abstract
A long-term transport experiment has been performed on a bioactive calcium phosphate glass of the molar composition 30CaO*25Na2O*45P2O5 using the technique of bombardment induced ion transport (BIIT) with potassium as foreign bombarder ion. Ion transport due to gradients of the electrical potential and the concentration lead to incorporation of K+ and depletion of both Na+ and Ca++ by electrodiffusion in the forward direction. The resulting concentration profiles have been quantitatively analyzed by time-of-flight secondary ion mass spectrometry (ToF-SIMS). The concentration profiles of the P+ and POx+ signals (x = 1–4) resemble those of the K+, Na+, and Ca++ signals, indicating a characteristic change of the local bonding situation. This is interpreted as an indirect hint of a change of local structure of the glass network. Because the concentration profiles imprinted by the BIIT constitute pronounced concentration gradients, these depletion profiles further evolve on a much longer time scale due to chem...
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