Abstract
The anodic process during electro-thermal poling of one bioactive and three bioabsorbable glasses was investigated by means of impedance spectroscopy and time-of-flight secondary ion mass spectrometry (ToF-SIMS). The bioactive glass with the nominal composition 46.4% SiO2, 25.2% Na2O, 25.2% CaO, 3.2% P2O5 (46S4) and the three bioabsorbable glasses of the CaX series ((55−X)% Na2O, X% CaO, 45% P2O5, with X=20, 30, 40) were poled at temperatures between 473K and 513K using voltages between 50V and 490V. Both impedance spectroscopy studies during poling and subsequent ToF-SIMS profiling show that the thickness of the Na+ ion depletion layer under the anode increases in a linear fashion with increasing poling voltage. However, the same absolute values for the thickness were only obtained under the assumption that the dielectric permittivity of the depletion layer is about 2–3 times lower than the dielectric permittivity of the bulk glass.
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