Separation of piezoelectric grain resonance and domain wall dispersion in Pb(Zr,Ti)O-3 ceramics

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.


Published in:
Applied Physics Letters, 94, 21, 212906
Year:
2009
Publisher:
American Institute of Physics
ISSN:
0003-6951
Keywords:
Laboratories:




 Record created 2009-06-25, last modified 2018-03-17

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