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      https://www.ias.ac.in/article/fulltext/boms/039/07/1765-1774

    • Keywords

       

      Perovskite; BaTiO$_3$; X-ray diffraction; spectroscopic ellipsometry; refractive index.

    • Abstract

       

      Fe and W co-substituted BaTiO3 perovskite ceramics, compositional formula BaTi$_{0.5}$(Fe$_{0.33}$W$_{0.17}$)O$_3$, were synthesized by the standard solid-state reaction method and studied by X-ray diffraction, scanning electronmicroscopy and spectroscopy ellipsometry. The prepared sample remains as double phases with the perovskite structure. The structure refinement of BaTi$_0.5$(Fe$_{0.33}$W$_{0.17}$)O$_3$ sample was performed in the cubic double and hexagonal setting of the Fm$\bar{3}$m and P6$_3$/mmc space groups. Spectral dependence of optical parameters; real and imaginaryparts of the dielectric function, refractive index, extinction coefficient and absorption coefficient were carried out in the range between 1.4 and 4.96 eV by using the ellipsometry experiments. Direct bandgap energy of 4.36 eV was found from the analysis of absorption coefficient vs. photon energy. In addition, the oscillator energy, dispersion energy and zero-frequency refractive index values were found from the analysis of the experimental data usingWemple–DiDomenico single-effective-oscillator model.

    • Author Affiliations

       

      FAYÇAL BOURGUIBA1 AHMED DHAHRI1 TAREK TAHRI2 KAMEL TAIBI3 JEMAI DHAHRI1 E K HLIL4

      1. Laboratory of Condensed Matter and Nanosciences, Faculty of Sciences of Monastir, Monastir 5019, Tunisia
      2. Laboratoire de Physique Appliqué, Département de Physique, Faculté des Sciences de Sfax, 3018 Sfax, Tunisia
      3. Laboratoire de Science et Génie des Matériaux, Faculté de Génie Mécanique et Génie des Procédés, Université des Sciences et de la Technologie Houari Boumediene, BP32 El Alia, Bab Ezzouar 16111, Algeria
      4. Institut Néel, CNRS-Université J. Fourier, B.P. 166, 38042 Grenoble, France
    • Dates

       
  • Bulletin of Materials Science | News

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