Borkar, Hitesh and Rao, Vaibhav and Tomar, M. and Gupta, Vinay and Kumar, Ashok (2018) Near room temperature bismuth and lithium co-substituted BaTiO3 relaxor ferroelectrics family. Journal of Alloys and Compounds, 737. pp. 821-828. ISSN 0925-8388

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Abstract

Eco-friendly lead-free relaxor ferroelectrics, Ba1-x (Bi0.5Li0.5)(x)TiO3 (BBLT) with x = 0.3, 0.4 and 0.5, have been synthesized by using the conventional solid-state reaction route. The crystal structure and phase purity were verified by x-ray diffraction (XRD) patterns using Rietveld refinement which revealed the presence of tetragonal (95-80%) and orthorhombic phases (5-20%) in the matrix. The temperature dependent dielectric constant and tangent loss dispersion spectra, slim ferroelectric-hysteresis, and nano-scale microstructures suggest the presence of short-range ordering (SRO)/polar nano-regions (PNRs) in the matrix. The dielectric spectra suggest that the dielectric dispersion increases with increase in Bi/Li concentrations which may be due to compositional fluctuations, ordering of cations at nano-scale and presence of metastable states of SRO and long-range ordering (LRO) regions. The nonlinear Vogel-Fulcher relationship is fitted for maximum dielectric constant temperatures (T-m) which provides activation energy and freezing temperature of all compositions. The current density (J) versus electric field (E) (J-E) data obey bulk-limited current conduction mechanisms that may be due to a diffusive displacement of Ti4+ at octahedral center, the creation of random fields due to in-homogeneity at A-site, and trap-assisted hoping of charge carriers under high E-fields

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Chemistry > Physical Chemistry Materials Science Metallurgy & Metallurgical Engineering
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	07 Nov 2019 11:41
Last Modified:	07 Nov 2019 11:41
URI:	http://npl.csircentral.net/id/eprint/3928

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