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      https://www.ias.ac.in/article/fulltext/boms/035/07/1039-1045

    • Keywords

       

      Perovskites; nanoparticles; combustion synthesis; dielectric properties; energy bandgap.

    • Abstract

       

      Nanocrystalline NdBa2ZrO5.5 has been successfully synthesized through a single step auto-ignition combustion route for the first time. X-ray diffraction and Fourier transform infrared spectroscopy revealed that the combustion product is phase pure and has an ordered cubic perovskite structure. The phase transitions and thermal stability of the nanopowder were investigated by differential thermal and thermogravimetric analyses. Transmission electron microscopy results indicated that the particle sizes are 20–30 nm. Selected area electron diffraction pattern has shown that as-prepared powder is polycrystalline in nature. The optical absorption spectra analysis confirmed that the material falls to the semiconducting range with a bandgap of ∼3.69 eV and therefore, could be used as transparent wide bandgap semiconductor. The relative density of the sintered sample is ∼96% at 1510 °C for 2 h. The surface morphology of the sintered pellet has been studied by scanning electron microscopy and the average grain size observed is ∼0.7 𝜇m. Dielectric constant (𝜀r) of NdBa2ZrO5.5 at 5 MHz is 29.6 and loss factor (tan 𝛿) is 4 × 10-2 at room temperature.

    • Author Affiliations

       

      V Ratheesh Kumar1 P R S Wariar1 R Pazhani2 J K Thomas2 R Jose3 J Koshy1

      1. Department of Physics, University College, Trivandrum 695 034, India
      2. Department of Physics, Mar Ivanios College, Trivandrum 695 015, India
      3. University of Malaysia Pahang, 26300 Kuantan, Malaysia
    • Dates

       
  • Bulletin of Materials Science | News

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