Flehpot

Session S8.10

11:45 AM S8.10
CONTRIBUTION TO THE DIELECTRIC BEHAVIOR OF RELAXORS FROM THE SURFACE OF NANO-ORDER CLUSTER IN THE MATERIALS. Z. -Y. Cheng and R. S. Katiyar, Univeristy of Puerto Rico, Dept of Physics, San Juan, PR.

Besides the contribution from the thermally activated flips of the polar regions, the contribution from the surface of frozen polar regions to the dielectric behavior of relaxors is introduced and discussed. Based on it, a formula is proposed to describe the temperature and frequency dependence of the dielectric constant. The formula is strictly certified with the measured data of some relaxors in a wide temperature range at frequencies from 100 Hz to 100 kHz. It is indicated that the dielectric response of the surface motion of the frozen polar regions is resonance. The difference between the relaxation and resonance processes is given, and a relationship between them is proposed. The frozen polar region is nano-order cluster. The difference between the frozen polar regions and the general ferroelectric nanocrystal is discussed.

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