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    • Keywords


      Molten salt; structural refinement; impedance; PL emission.

    • Abstract


      SrBi$_{0.95}$Sm$_{0.05}$Ta$_{2-x}$V$_x$O$_9$ (x = 0, 0.05, 0.1, 0.2) compounds, which have been studied through X-ray diffraction Rietveld refinement, Fourier transform infrared (FTIR), absorption and emission techniques, were prepared through the molten salt method. All samples were refined in the orthorhombic system without any secondary phase detected. The Ta–O bond strength in the compounds is revealed by FTIR and Rietveld measurements. Along with scanning electron microscopic analysis, ceramics also consist of plate-like grains that decreased with the V content increasing. The difference in absorption spectra is attributed to localized tail stats within the bandgap. According to the impedance and AC conductivity results, after introducing vanadium into the structure, the V-doped SrBi$_{0.95}$Sm$_{0.05}$Ta$_2$O$_9$ ceramics exhibit higher conductivity. The reason that x = 0.1 ceramic has the smallest semicircle radius referring to ahigher efficient charge carrier transfer is that this ceramic sample is mainly composed of large particles. Samarium emits orange-red colour at wavelength 599 nm, which is attributed to ${}^4$G$_{5/2}$ ${\rightarrow}$ ${}^6$H$_{7/2}$ transition. Regarding photoluminescence intensity, the more vanadium ions are introduced into the lattice, the fewer emission peaks are obtained. The latter has been interpreted in terms of the inhibition of the transfer of energy from one ion to another. In essence, The red photoluminescence emission intensity of Sm$^{3+}$ ions were successfully enhanced in SrBi$_{0.95}$Sm$_{0.05}$Ta$_{2-x}$V$_x$O$_9$ (x = 0.05).

    • Author Affiliations



      1. Semlalia Faculty of Sciences, Cadi Ayyad University, 40000 Marrakech, Morocco
      2. Faculty of Physics, University of Belgrade, Studentskitrg 12-16, 11158 Belgrade, Serbia
      3. Guilin University of Technology, Guilin 541006, China
    • Dates

  • Bulletin of Materials Science | News

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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

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