Journal of Physical Studies 11(3), 289–293 (2007)
DOI: https://doi.org/10.30970/jps.11.289 THE MODELLING OF DIELECTRIC SPECTRA OF THE δ-PHASE Bi2O3 FILMSI. M. Chernenko, V. M. Duda, K. V. Chasovsky
Dnipropetrovsk National University |
Every dispersion species from three different ones observed in the dielectric spectra $ε'(ω)$, $ε”(ω)$ of $δ$-Bi$_{2}$O$_{3}$ films in the temperature interval 20-200$^{\circ}$C has been fit by the frequency characteristics of the simplest $RC$-circuits whose ideal capacities were changed by ‟universal” ones. A resultant equivalent circuit (consisting of two ‟universal” capacities $C_{n}(ω)=B_{n}(jω)^{n}$, $C_{m}(ω)=B_{m}(jω)^{m}$ and a single active resistor $R$) whose frequency characteristics reflects experimental data sufficiently well are suggested. At $n$, $m=1$ this circuit represents well known Debye equivalent circuit. In accordance with the suggested dispersion mechanisms the obtained results have allowed to determine the temperature dependencies of the volume $dc$-conductivity $σ(0)$, conduction and space charge relaxation times $τ_{1}$ and $τ_{2}$, respectively, as well as volume dielectric permittivity $ε_ınfty}$, space charge region capacitance $C_{\rm sc}$, and parameters $(n, m)$ characterizing ‟universal” capacities.
PACS number(s): 73.40.-c