Disordered Ferroelectric Systems: Giant Dielectric Enhancement, Maxwell-Wagner Relaxations and Conductor–Insulator Transition
Authors:
- 1 January 2004
- journal article
- research article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 307 (1) , 171-176
Abstract
Simultaneous consideration is carried out for dielectric permittivity, conductivity, piezoelectric, and elastic properties of statistical mixtures and ferroelectric ceramics with disorderly distributed and oriented crystallites. The divergence of the static dielectric permittivity on the percolation threshold for the conductor-insulator transition and a giant dielectric relaxation are confirmed. The Maxwell-Wagner relaxations of the complex piezoelectric coefficients and elastic compliances are studied in detail too. All relaxation spectra differ considerably from the Debye ones and have approximately the Cole-Cole character. The essential difference between average relaxation times for dielectric and piezoelectric (elastic) relaxations was found for the first time.Keywords
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