Study of diffuse phase transition and relaxor ferroelectric behavior of Ba0.97Bi0.02Ti0.9Zr0.05Nb0.04O3 ceramic
作者： Z. Raddaoui , S. El Kossi , J. Dhahri , N. Abdelmoula , K. Taibi
DOI: 10.1039/C8RA08910H
关键词:
摘要: In the present work, structural and dielectrics properties of polycrystalline sample Ba0.97Bi0.02Ti0.9Zr0.05Nb0.04O3 (BBTZN) prepared by a molten-salt method were investigated. X-ray diffraction analyses revealed formation single-phase pseudocubic structure with Pmm space group. Unlike trend observed in classic ferroelectrics, temperature dependence dielectric constants showed presence three sequences phase transitions. fact, local disorder provides frequency dependent relaxor like behaviours attributed to dynamic polar nanoregions (PNRs). The diffuse transition (DPT) analyzed using modified Curie–Weiss law Lorenz formula confirms short-range association between nanopolar domains. obtained values degree diffuseness are found be range 1.58–1.78 due existence different states polarization and, hence, relaxation times regions. at maxima, which is governed production PNRs high temperature, satisfies Vogel–Fulcher (V–F) law. electric modulus for various frequencies indicating thermally activated ascribed Maxwell–Wagner (M–W) charge phenomenon.
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