• Interesting cationic (Li+/Fe3+/Te6+) variations in new rocksalt ordered structures

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      https://www.ias.ac.in/article/fulltext/jcsc/127/02/0225-0233

    • Keywords

       

      Lithium-based oxides; rocksalt superstructures; single crystal XRD; honeycomb ordering; UV-visible diffuse reflectance.

    • Abstract

       

      A new series of layered oxides, Li3(Li1.5xFe3−(x+1.5x)Tex)O6, (0.1 ≤ 𝑥 ≤ 1.0) possessing rock-salt superstructures crystallizing in monoclinic (S.G. C2/m) symmetry is reported here. Investigations based on single crystal and powder X-ray diffraction studies for the 𝑥 = 1 member, Li3(Li1.5Fe0.5Te)O6, (a=5.1834(1); b=8.8858(2); c=5.16840(8) Å; 𝛽=110.660(1)°) confirmed the stabilization of (Li1.5Fe0.5Te1.0O6)3− honeycomb arrays with a very high amount of lithium ions. The structure for the x = 0.5 member (Li3.75Fe1.75Te0.5O6) has also been confirmed by the powder X-ray diffraction Rietveld refinements. Li3(Li1.5Fe0.5Te)O6 and Li3(Li0.75Fe1.75Te0.5)O6 oxides exhibited Curie–Weiss behaviour in the temperature range of 50–300 K with negative 𝜃 values. Their respective ionic conductivities were found to be 6.76 × 10−5 S cm−1 and 2.21 × 10−6 S cm−1 at 573 K. The UV-visible diffuse reflectance measurements for the differentmembers of the series Li3(Li1.5xFe3−(x+1.5x)Tex)O6, (0.1 ≤ 𝑥 ≤ 1.0) show the expected shifts in their absorptionedges based on the increasing amount of Fe3+ions starting from 𝑥 = 1.0 member to 𝑥 = 0.1 member

    • Author Affiliations

       

      Akanksha Gupta1 Vinod Kumar1 S Uma1

      1. Materials Chemistry Group, Department of Chemistry, University of Delhi, Delhi 110 007, India
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