Study of the electrical properties of Pb(Zn,Ni)1/3Nb2/3O3–PbTiO3 ceramics across the morphotropic phase boundary
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Structure and electrical properties of (1 − x)Pb(Zn0.2Ni0.8)1/3Nb2/3O3–xPbTiO3 ceramics with x = 0.24–0.38 were examined in detail. X-ray diffraction measurements reveal that all samples are in pure perovskite phase, and most of them lie within the morphotropic phase boundary (MPB) region. The dielectric behaviors of all compositions are characterized with diffuse phase transition and frequency dispersion. The variable power law and the Vogel–Fulcher relation have been used to describe such dielectric behaviors. The highest dielectric constant and the largest piezoelectric coefficient are simultaneously observed when x = 0.30. The variation of the ferroelectric property with PT content is also discussed.
KeywordsMorphotropic phase boundary Perovskite phase Electrical properties Relaxor ferroelectrics
This work is a part of Project 50432030 supported by National Natural Science Foundation of China.