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Journal of Materials Science

, Volume 49, Issue 17, pp 5997–6006 | Cite as

Study on Mn-induced Jahn–Teller distortion in BiFeO3 thin films

  • Surbhi Gupta
  • Monika Tomar
  • Vinay Gupta
Article

Abstract

Present work reports Raman spectroscopy study of single-phase Mn-doped BiFeO3 [BiFe1−x Mn x O3 (0 ≤ x ≤ 0.20)] polycrystalline thin films carried out in backscattering geometry. De-convolution of Raman spectra showed a gradual transition in the crystal symmetry from rhombohedral (−R) to multiphase [rhombohedral (−R) + tetragonal (−T)] structure with increasing Mn doping concentration in BiFe1−x Mn x O3 (BFMO) thin films. X-ray diffraction (XRD) along with Le-Bail extraction refinement confirms that the structural symmetry lowering in BFMO thin films occurs at about 10 % Mn doping concentration. A blue shift is observed in the direct energy band gap of BFMO thin films from 2.53 to 2.87 eV (at T = 295 K) and is attributed to the local symmetry lowering and local induced strain in Fe3+ environment resulted from Jahn–Teller distortion in (MnFe)3+O6 octahedral unit. Second-derivative analysis of FTIR spectra in the spectral regions (420–470) cm−1 and (480–680) cm−1 further indicates the favourable structure distortion leading to the simultaneous exhibition of enhanced ferromagnetic and ferroelectric properties owing to Mn substitution in host BiFeO3 lattice.

Keywords

BiFeO3 Phonon Mode Thin Film Sample Lattice Dynamic Property Vibrational Phonon Mode 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

Authors are thankful to the Department of Science & Technology (DST), Government of India for the financial support to carry out the work. One of the authors (SG) is thankful to the University of Delhi for the research fellowship (UTA).

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of Physics and AstrophysicsUniversity of DelhiDelhiIndia
  2. 2.Physics Department, Miranda HouseUniversity of DelhiDelhiIndia

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