Open AccessИсследование электрофизических характеристик катион-замещенной керамики гексаалюмината бария методом импедансной спектроскопии
Author(s) -
Б.А. Беляев,
Н. А. Дрокин,
В.А. Полубояров
Publication year - 2018
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2018.02.45380.226
Subject(s) - materials science , barium , electrical impedance , relaxation (psychology) , ceramic , crystallite , analytical chemistry (journal) , electrical resistivity and conductivity , aluminium , capacitor , equivalent circuit , condensed matter physics , nuclear magnetic resonance , voltage , chemistry , composite material , electrical engineering , physics , psychology , social psychology , chromatography , metallurgy , engineering
We report on the behavior of frequency and temperature dependences of the impedance of a measuring cell in the form of a parallel-plate capacitor filled with barium hexaaluminate ceramics with four aluminum cations replaced by iron (BaO · 2Fe_2O_3 · 4Al_2O_3). The measurements have been performed in the frequency range of 0.5–10^8 Hz at temperatures of 20-375°C. A technique for determining the electrical properties of the investigated ceramics is proposed, which is based on an equivalent electric circuit allowing the recorded impedance spectra to be approximated with sufficiently high accuracy. The established spectral features are indicative of the presence of two electric relaxation times different from each other by three orders of magnitude. This fact is explained by the difference between the charge transport processes in the bulk of crystallites and thin intercrystallite spacers, for which the charge activation energies have been determined.