DIELECTRIC RELAXATION BEHAVIOR OF CERAMICS IN THE Pb(Zn1/3Nb2/3)O3-BaTiO3-PbTiO3 SYSTEM |
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| Affiliation: | Electronic Materials Research Laboratory, Xi′an Jiaotong University, Xi′an 710049, China |
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| Abstract: | The dielectric properties of ceramics in Pb(Zn1/3Nb2/3)O3-BaTiO3-PbTiO3 system were characterized using dielectric-temperature spectra. A spontaneous (zero field) relaxor-normal ferroelectric tran sition was observed for tetragonal rich compositions. A significant hysteresis effect accompanied by this transition, similar to first-order phase transition of normal ferroelectrics. This behavior was different from that of other relaxors, in which such transitions occurred only under a biased dc field. This observation was explained in terms of a thermally driven transformation from an ensemble of polar microregions to normal long-range ferroelectric state (micro-macro domain transition), which was attributed to the internal field resulting from the tetragonal strain. |
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