Abstract
A glass with the composition 48.5SiO 2 · 48.5B 2O 3 · 3Na 2O was studied at temperatures in the range from 340 to 860 °C using impedance spectroscopy. The spectra obtained were simulated using a simple equivalent circuit. During cooling of a sample, the specific conductivity of the sample decreased according to Arrhenius equation until at temperatures <670 °C phase separation occurs (droplet phase: Na 2O/B 2O 3-rich) which runs parallel to deviations from linearity in the Arrhenius plot. In the temperature range from 670 to 630 °C, specific conductivities at constant temperature depend on time due to decreasing Na 2O concentrations in the matrix during cooling and increasing Na 2O-concentrations during heating. The specific conductivities during heating and cooling exhibit a hysteresis which is explained by changes in the chemical compositions of matrix and droplet phase during thermal treatment which, however, always deviate from the equilibrium concentrations at temperatures <670 °C.
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