Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3147166
Keywords
dielectric polarisation; dielectric resonance; electric domains; grain size; high-frequency effects; lead compounds; piezoceramics; zirconium compounds
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Funding
- Swiss National Science Foundation [200021-116038]
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We report on the experimental investigation of a high-frequency (1 MHz-1.8 GHz) dielectric dispersion in unpoled and poled Pb(Zr,Ti)O-3 ceramics. Two overlapping loss peaks could be revealed in the dielectric spectrum. The linear dependence between the lower-frequency peak position and average grain size D, which holds for D/<= 10 mu m, indicates that the corresponding polarization mechanism originates from piezoelectric resonances of grains. The intensity of the higher-frequency peak is drastically reduced by poling. It is thus proposed that this loss peak is related to domain wall contribution to the dielectric dispersion.
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