DIELECTRIC PROPERTIES OF BARIUM CRYSTAL GLASS

The temperature dependence of impedance spectra of industrially produced (RONA, Lednick Rovne, Slovakia) barium crystal glass was studied. The linear dependence of complex impedance on the sample thickness was used for separating the bulk dielectric properties from the electrode boundary effects. The temperature dependence of direct current conductivity was evaluated from the Nyquist plots. The ZARC circular line was adjusted to the Nyquist plots by the least squares method. The distribution of relaxation times in impedance was evaluated this way. More detailed analysis of impedance spectra was performed by the equivalent circuit method in capacitance. Four relaxation processes were identified this way.