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Journal of Materials Science
Erschienen in: Journal of Materials Science 17/2014

01.09.2014

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

verfasst von: Surbhi Gupta, Monika Tomar, Vinay Gupta

Erschienen in: Journal of Materials Science | Ausgabe 17/2014

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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.
Vorheriger Artikel Random l-lactide/ε-caprolactone copolymers as drug delivery materials
Nächster Artikel Nanocrystallization in Ni60Ta40 and Ni60Nb40 metallic glasses below calorimetric glass transition

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Metadaten
Titel
Study on Mn-induced Jahn–Teller distortion in BiFeO3 thin films
verfasst von
Surbhi Gupta
Monika Tomar
Vinay Gupta
Publikationsdatum
01.09.2014
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 17/2014
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-014-8318-9

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