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      https://www.ias.ac.in/article/fulltext/pram/063/02/0189-0197

    • Keywords

       

      Pyrochlores; neutron diffraction; complex impedance spectroscopy

    • Abstract

       

      Nd2Sn2O7 pyrochlores with the substitution of Zr4+ were prepared by conventional ceramic double sintering technique. The single-phase formation was confirmed by X-ray diffraction and neutron diffraction techniques. Relative intensity calculations for X-ray diffraction analysis were performed for oxygen positional parametersx = 0.331 and 0.375, while Rietveld refinements were employed for neutron diffraction data. The neutron diffraction study revealed that there are only two anion sites with 48f and 8b positions. This indicates that the 8a site, i.e. O(3) sublattice, is completely vacant and the structure is a perfect cubic pyrochlore with space group Fd3m (Oh7). From the conductivity measurements, it is observed that the electronic conductivity dominates from room temperature up to about 525 K and forT > 525 K, the oxygen ion conduction dominates the charge transport in these compositions. Complex impedance spectroscopy indicates the existence of grain and grain boundary as two separate elements.

    • Author Affiliations

       

      Y D Kolekar1 S B Kulkarni2 Keka Chakraborty3 A Das3 S K Paranjpe3 4 P B Joshi2

      1. Physics Department, Shivaji University, Kolhapur - 416 004, India
      2. Physics Department, Shivaji University PG Centre, Solapur - 413 255, India
      3. Condensed Matter Physics Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India
      4. International Atomic Energy Agency, Vienna, Austria
    • Dates

       
  • Pramana – Journal of Physics | News

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