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Investigation of Polarization Mechanism of Relaxor Ferroelectrics

Published online by Cambridge University Press:  15 February 2011

Z. -Y. Cheng ,
R. S. Katiyar  and
Yao Xi
Z. -Y. Cheng
Affiliation:
Department of Physics, P. O. Box 23343, University of Puerto Rico, San Juan, PR 00931–3343, USA Electronic Materials Research Laboratory (EMRL), Xi'an Jiaotong University, Xi'an 710049, CHINA
R. S. Katiyar
Affiliation:
Department of Physics, P. O. Box 23343, University of Puerto Rico, San Juan, PR 00931–3343, USA
Yao Xi
Affiliation:
Department of Physics, P. O. Box 23343, University of Puerto Rico, San Juan, PR 00931–3343, USA
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Abstract

Addition to thermally activated flips of polar regions in relaxor ferroelectrics, a new polarization mechanism, which originates from the vibrations (breathing) of surface of polar regions, is introduced to explain the dielectric behavior of relaxor ferroelectrics. This new mechanism plays an important role in the dielectric behavior of such materials at low temperature. Based on the above assumption and general dielectric theory, a formula is given to characterize the temperature dependence of the dielectric constant. The correctness of the formula is verified by using it to fit the experimental results of the two typical relaxors. The fitted results show that the method is of high precision and that the temperature of the dielectric constant maximum is decided by the two polarization behavior. It also indicates that the new polarization is a resonance polarization.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 455
Copyright
Copyright © Materials Research Society 1997

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References

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