Abstract
In this communication, the effect of gadolinium (Gd) substitution on structural, microstructural, electrical and dielectric properties of bismuth ferrite BiFeO3 (i.e. Bi(Fe0.95Gd0.05)O3 abbreviated as BFGO5) has been reported. The development of an environment-friendly lead-free multiferroic material by substituting a rare earth element at the uncommon site of BiFeO3 (BFO) (i.e. Gd at the Fe site rather than commonly preferred Bi site) for the tailoring of its multiferroic properties has been attempted in this study. The present studied material has been fabricated through a conventional standard solid-state reaction (SSR) method using carbonates and high-quality oxides in a stoichiometric amount. The phase formation and basic crystal data were analysed by X-ray diffraction technique which shows a single-phase formation of BFGO5 material in orthorhombic symmetry. The average crystallite size was calculated using Scherrer’s formula and found to be 84 nm. The surface morphology and compositions examined by FE-SEM, EDX, FT-IR and TEM show the formation of highly compact sample with uniform distribution of grains. Detailed studies of dielectric parameters (dielectric constant and tangent loss) in a selected frequency range (1–1000 kHz) at different temperatures (273–773 K) clearly exhibit enhancement on dielectric properties of BFO. Studies of its impedance spectroscopy, electrical modulus and electrical conductivity confirm the semiconductor behaviour [negative temperature coefficient of resistance (NTCR)] and non-Debye type relaxation process of the material. The polarization versus electric field (P–E) analysis of BFGO5 shows an improvement in remnant polarization as compared to the parent compound BFO. Therefore, based on the several investigations of results, the BFGO5 material could be considered as a favourable candidate for electronic device applications.
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08 September 2021
Editor's Note: Readers are alerted that the reliability of the data presented in this article is subject to criticism that is being considered by the editors. We will update readers once we have further information and all parties have been given an opportunity to respond in full.
19 May 2022
This article has been retracted. Please see the Retraction Notice for more detail: https://doi.org/10.1007/s00339-022-05625-7
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Acknowledgements
The authors are grateful to National Physical Laboratory, New Delhi, for providing some TEM characterization facility. Author Alok Shukla gratefully acknowledges the financial support received from SERB-DST, Government of India, New Delhi, in the form of Research Project no. EMR/2015/002420.
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Thansanga, L., Shukla, A., Kumar, N. et al. RETRACTED ARTICLE: Study of effect of Gd substitution at the Fe site on structural, dielectric and electrical characteristics of BiFeO3. Appl. Phys. A 125, 764 (2019). https://doi.org/10.1007/s00339-019-3058-y
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DOI: https://doi.org/10.1007/s00339-019-3058-y