Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1595868 | Solid State Communications | 2006 | 4 Pages |
Abstract
Ferroelectric materials present a dielectric dispersion in the frequency range of 0.1-1 GHz, which has been attributed to either a relaxation or a resonance process. However, the results reported in the literature have not been conclusive enough to distinguish clearly each process. In this work, the dielectric response of La-modified lead titanate ferroelectric ceramics were carefully investigated in both unpoled and poled state in the frequency range of 0.05-1Â GHz. The results revealed clearly that the dielectric dispersion is highly anisotropic and can be associated with an overdamped process (relaxation-like) or a damped resonance process, which depends on the measuring direction. It was found that the dielectric dispersion can be modelled as a resonance process, which is either damped or overdamped when the ferroelectric or the ferroelastic contribution prevails.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
J. de Los S. Guerra, L.A. Bássora, J.A. Eiras,