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Electron spin resonance study and improved magnetic and dielectric properties of Gd–Ti co-substituted BiFeO3 ceramics

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Abstract

Polycrystalline BiFeO3 (BFO), Bi0.90Gd0.10FeO3 (BGF), Bi0.90Gd0.10Fe1−xTixO3 (x = 0.03–0.10; BGFTx) ceramics were prepared via solid state reaction method. X-ray diffraction studies reveal R3c symmetry for BFO and BGF samples and coexistence of R3c + Pn2 1 a symmetries for BGFTx samples. The change in line width of Raman modes indicates the structural distortion and substitution of dopants ions in the BFO lattice. Magnetic studies show weak ferromagnetism in BGF and BGFTx samples as a result of Gd3+–Fe3+, Gd3+–Gd3+ interactions and imbalance created between two antiparallel Fe3+ spin sublattices by Ti substitution. The maximum remnant magnetization of 0.141 emu/g is observed for BGFTx=0.10 sample. Further, electron spin resonance study confirms the weak ferromagnetism of BGFTx samples, associated with small grains and increase in anisotropy of particles distribution as found during SEM studies. UV–Visible absorption spectra in the spectral range from 1.6 to 3.5 eV showed one d–d crystal field transition and two charge-transfer transitions with optical band gap variation in visible region. Improved dielectric properties with very low values of dielectric loss have been observed for BGF and BGFTx samples.

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Acknowledgments

This work was financially supported by Department of science and Technology (DST), India through Grant No. SR/FTP/PS-91/2009. Prakash Chandra Sati is also thankful to DST for providing INSPIRE Fellowship.

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Authors and Affiliations

  1. Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida, 201307, India

    Manoj Kumar, Prakash Chandra Sati & Sandeep Chhoker

Authors
  1. Manoj Kumar
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  2. Prakash Chandra Sati
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  3. Sandeep Chhoker
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Correspondence to Manoj Kumar.

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Kumar, M., Sati, P.C. & Chhoker, S. Electron spin resonance study and improved magnetic and dielectric properties of Gd–Ti co-substituted BiFeO3 ceramics. J Mater Sci: Mater Electron 25, 5366–5374 (2014). https://doi.org/10.1007/s10854-014-2315-2

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  • DOI: https://doi.org/10.1007/s10854-014-2315-2

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