Abstract
Dielectric and ferroelectric characteristics for Pb1−xBax(Fe1/2Nb1/2)O3 (x = 0, 0.05, 0.1, 0.15, and 0.2) ceramics are determined together with their structures. X-ray diffraction (XRD) analysis confirms the solid solutions with the cubic structure. The dielectric nature changes from diffuse ferroelectric to relaxor ferroelectric with increasing x, while the phase transition temperature TC (or Tm) decreases monotonously. The diffuse ferroelectric phase transition is observed in the solid solutions with 0 ≤ x ≤ 0.05. For Pb1—xBax(Fe1/2Nb1/2)O3 with 0.1 ≤ x ≤ 0.2, relaxor ferroelectric behavior is determined, and the Vogel-Fulcher equation is used to describe the relaxor behavior. The 1/ε versus T plots reveal the diffusion dielectric characteristics in both diffuse and relaxor ferroelectrics.
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