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Relaxor behavior of $BaBi_4Ti_3Fe_{0.5}Nb_{0.5}O_{15}$ceramics

Kumar, Sunil and Varma, KBR (2008) Relaxor behavior of $BaBi_4Ti_3Fe_{0.5}Nb_{0.5}O_{15}$ceramics. In: Solid State Communications, 147 (11-12). pp. 457-460.

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Abstract

Monophasic $BaBi_4Ti_3Fe_{0.5}Nb_{0.5}O_{15}$ (BBTFN) which exhibited relaxor ferroelectric properties has been synthesized via the solid-state reaction route. X-ray powder diffraction (XRD) studies carried out at room temperature confirmed the phase to be an n=4 member of the Aurivillius family of oxides. The XRD pattern was indexed to an orthorhombic cell associated with lattice parameters a = 5.463(3) \AA, b = 5.443(3) \AA and c = 41.77(2) \AA. A broad dielectric peak associated with the frequency dependent dielectric maximum temperature was observed. The high temperature slope of the dielectric peak was characterized by the Lorenz-type quadratic law for relaxors. The dielectric relaxation was modeled using the Vogel-Fulcher relationship with activation energy $E_a = 0.014 \pm 0.002 eV$ and freezing temperature $T_{VF} = 558 \pm 1 K.$. Relaxor behavior and the incidence of ferroelectric hystersis (P vs E) loop at room temperature suggested the coexistence of long-range polar ordering with the polar nanoregions induced by compositional fluctuations.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier
Keywords: Ferroelectrics;Ceramics;Dielectric response
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 14 May 2009 06:41
Last Modified: 19 Sep 2010 04:51
URI: http://eprints.iisc.ernet.in/id/eprint/16274

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