Impedance Spectroscopy Study of the Electrical Properties of Cation-Substituted Barium Hexaaluminate Ceramics |
| |
| Authors: | B A Belyaev N A Drokin V A Poluboyarov |
| |
| Institution: | 1.Kirensky Institute of Physics, Federal Research Center KSC SB RAS,Russian Academy of Sciences,Krasnoyarsk,Russia;2.Siberian Federal University,Krasnoyarsk,Russia;3.Siberian State Aerospace University,Krasnoyarsk,Russia;4.Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch,Russian Academy of Sciences,Krasnoyarsk,Russia |
| |
| Abstract: | 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 · 2Fe2O3 · 4Al2O3). The measurements have been performed in the frequency range of 0.5–108 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. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
