| Structural, Dielectric and Impedance Spectroscopic
Studies on Fe Doped BaTiO3 |
Shukdev Pandey, Om Parkash and Devendra Kumar*
Pages : 209-218
DOI : 10.1080/0371750X.2018.1526653 |
| Abstract |
| ABSTRACT
Compositions with x=0.03, 0.05 and 0.10 are synthesized in the system
BaFexTi1–xO3 using conventional solid state reaction method and characterized by
X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive
X-ray spectroscopy (EDX). XRD patterns reveal the coexistence of tetragonal and
hexagonal phases which are strongly affected by the level of Fe doping. The
hexagonal phase increases with increasing x, being maximum for x=0.10. SEM
images show the presence of agglomerated grains which increase in size with
amount of Fe doping. SEM for x=0.10 shows mostly rod-like or rectangular grains
indicating predominantly hexagonal phase. Dielectric and impedance measurements
have been carried out in the frequency range 20 Hz-1 MHz as a function of
temperature (300-650 K). The samples with x=0.03 and 0.05 exhibit diffuse phase
transition. Using complex impedance analysis equivalent circuit models have been
developed which represent the data well and successfully separate out the
contributions of tetragonal phase, hexagonal phase, grain boundaries and electrodes.
[Keywords: Fe doped BaTiO3, Dielectric response, Diffuse phase transition, Impedance
spectroscopy] |
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