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Published in:
29-11-2016
Ba0.06(Na1/2Bi1/2)0.94TiO3–Ba(Fe1/2Ta1/2)O3: giant permittivity lead-free ceramics
Published in: Journal of Materials Science: Materials in Electronics | Issue 6/2017
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Abstract
Perovskite type lead-free (1 − x)Ba0.06(Na1/2Bi1/2)0.94TiO3–xBa(Fe1/2Ta1/2)O3 (0 ≤ x ≤ 1.0) ceramics have been synthesized using solid-state reaction method and characterized by X-ray diffraction, scanning electron microscopy, FTIR, Raman spectroscopy and dielectric studies. X-ray diffraction studies of all the ceramics suggested the formation of single phase with crystal structure transforming from rhombohedral–tetragonal (R3c) to hexagonal (P3m1) symmetry with the increase in Ba(Fe1/2Ta1/2)O3-content. Raman and FTIR spectra also confirmed the formation of single phase solid solutions. Dielectric studies showed the giant permittivity ~106 in x = 0.50 and 0.75 compositions and the phase transition is found to be of diffusive character. The simultaneous occurrence of compositional fluctuations and weak ferroelectric interactions were considered to be the main cause for diffusivity.