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      https://www.ias.ac.in/article/fulltext/boms/031/05/0719-0722

    • Keywords

       

      Samarium barium antimonite; nanoparticles; combustion synthesis; sintering.

    • Abstract

       

      Nanoparticles of barium gadolinium antimonate (Ba2GdSbO6), a complex perovskite-type oxide, has been synthesized using an auto ignition combustion process for the first time. The nanoparticles thus obtained have been characterized by powder X-ray diffraction, thermogravimetric analysis, differential thermal analysis, Fourier transform infrared spectroscopy and transmission electron microscopy. The XRD studies have shown that the as-prepared powder is phase pure Ba2GdSbO6 and has a complex cubic perovskite (A2BB′O6) crystalline structure with lattice constant, 𝑎 = 8.449 Å. The TEM image reveals that the particle size of the as-prepared nano powder was in the range 30–60 nm. The nanocrystals of Ba2GdSbO6 synthesized by the combustion technique could be sintered to 96% of the theoretical density by heating at a temperature of 1560°C for a short duration of 3 h. The surface morphology of the sintered pellet has been studied by scanning electron microscope (SEM). The dielectric constant ($\varepsilon_{r}$) was 20 and the loss factor (tan𝛿) was 0.03 at 3 MHz. By the present combustion technique a phase pure nanopowder of Ba2GdSbO6 could be obtained by a single step process without the need of any calcination step.

    • Author Affiliations

       

      C Vijayakumar1 H Padma Kumar2 Sam Solomon3 J K Thomas2 P R S Warriar1 J Koshy2

      1. Department of Physics, University College, Trivandrum 695 034, India
      2. Electronic Materials Research Laboratory, Department of Physics, Mar Ivanios College, Trivandrum 695 015, India
      3. Department of Physics, St. Johns College, Anchal 691 306, India
    • Dates

       
  • Bulletin of Materials Science | News

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