Journal of Alloys and Compounds2022，Vol.89311.DOI:10.1016/j.jallcom.2021.162225

Multiferroic, optical and magneto-dielectric properties with enhanced magneto-impedance characteristic of KBiFe2O5

Khan, Bushra Singh, Manoj K. Kumar, Aditya Pandey, Arushi Dwivedi, Sushmita Kumar, Upendra Ramawat, Surbhi Kukreti, Sumit Dixit, Ambesh Roy, Somnath C.
Journal of Alloys and Compounds2022，Vol.89311.DOI:10.1016/j.jallcom.2021.162225
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  • NSTL
  • Elsevier

Multiferroic, optical and magneto-dielectric properties with enhanced magneto-impedance characteristic of KBiFe2O5

Khan, Bushra 1Singh, Manoj K. 1Kumar, Aditya 1Pandey, Arushi 1Dwivedi, Sushmita 1Kumar, Upendra 2Ramawat, Surbhi 3Kukreti, Sumit 3Dixit, Ambesh 3Roy, Somnath C.4
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作者信息

  • 1. Univ Allahabad
  • 2. IIIT Allahabad
  • 3. Indian Inst Technol Jodhpur
  • 4. Indian Inst Technol Madras
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Abstract

KBiFe2O5 (KBFO) is an interesting multiferroic compound with the coexistence of ferroelectric and ferromagnetic phases with a narrow band gap. In this work, KBiFe2O5 (KBFO) is synthesized using a sol-gel technique, followed by calcination at 973 K. Rietveld refinement analysis of XRD data confirms the presence of monoclinic crystal structure with space group P2/c. The SEM micrograph of KBFO reflects the irregular shape of grains with slight agglomeration. The optical band gap measured by UV visible spectroscopy of KBFO is found to be 1.56 eV. The multiferroic behavior of KBFO has been confirmed by the electrical (dielectric) and magnetic (M-H loop) measurements. A weak ferromagnetic nature is observed due to canting of the magnetic moment of G-type anti-ferromagnetic ordering. The dielectric studies reveal the Maxwell Wagner type dispersion and an anomaly near magnetic phase transition temperature. KBFO shows negative magneto-dielectric (MD) coupling as both epsilon and tan delta decreases with the increasing magnetic field. Impedance spectroscopy is performed to analyze the intrinsic and extrinsic effects in MD coupling. The Nyquist plot shows positive magneto-resistance and negative magneto-capacitance which represent strong MD coupling in KBFO. It also reveals that the bulk property (intrinsic effect) dominates over the extrinsic effect in the sample. These results affirm that KBFO is a new candidate for room-temperature multiferroicity with a suitable bandgap and strong MD coupling for photovoltaic applications. (C) 2021 Elsevier B.V. All rights reserved.

Key words

Multiferroic/Dielectric constant/Bandgap/Magneto Dielectric Coupling/ELECTRICAL-PROPERTIES/COMPOSITES/BIFEO3/SIZE

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出版年

2022
Journal of Alloys and Compounds

Journal of Alloys and Compounds

EISCI
ISSN：0925-8388
被引量7
参考文献量46
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