Dielectric Characterization and AC Impedance Studies of Composite Ceramics xBiFeO3-(1-x)Sr2Bi4Ti5O18
Abstract
The xBiFeO3-(1-x)Sr2Bi4Ti5O18(SBFTi-x, x=0, 0.1, 0.3 and 0.5) composite ferroelectric ceramics were prepared by sol-gel with self-propagating combustion method. The dielectric properties and AC impedance were analyzed. Six-layered Aurivillius structure was confirmed from the X-ray analysis. With the increasing of BiFeO3 content, Bi3+ and Fe3+ co-doped in A and B site cause the lattice distortion in SBFTi-x ceramic, and the Curie temperature continuous increasing and the dielectric peak gradually broadened due to disordered distribution of ions. Besides, The electrical structure in SBFTi-x ceramics become uniform and all samples show negative temperature coefficient characteristics. Space charge polarization and mixed relaxation processes were also found in SBFTi-x ceramics.
Keywords
Sol-gel, Dielectric properties, Relaxation
DOI
10.12783/dtmse/icmsea/mce2017/10814
10.12783/dtmse/icmsea/mce2017/10814
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