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    • Keywords

       

      Lanthanum samarium oxalate crystals; growth; UV-visible; XRD; TGA; DSC; IR; EDAX; XPS

    • Abstract

       

      Lanthanum samarium oxalate (LSO) single crystals are grown in silica gels by the diffusion of a mixture of aqueous solutions of lanthanum nitrate and samarium nitrate into the test tube having the set gel impregnated with oxalic acid. Tabular crystals of LSO having well defined hexagonal basal planes are observed at different depths inside the gel. LSO crystals grown by this method are colourless and transparent. Laue transmission X-ray diffraction pattern of LSO reveals well defined spots with two-fold symmetry along the horizontal axis. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) support that LSO loses water around 120°C, and CO and CO2 around 350–450°C. The infrared (IR) absorption spectrum of LSO establishes the presence of oxalate (C2 O4)2− ions. Energy dispersive X-ray analysis (EDAX) confirms the presence of La and Sm in the sample. X-ray photoelectron spectroscopic (XPS) studies of LSO confirm the presence of La and Sm in their respective oxide states. An empirical structure for LSO has been proposed on the basis of these findings.

    • Author Affiliations

       

      Varughese John1 M A Ittyachen1 K S Raju1 2

      1. School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam - 686 031, India
      2. Department of Crystallography and Biophysics, University of Madras, Guindy Campus, Madras - 600 025, India
    • Dates

       
  • Bulletin of Materials Science | News

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      Posted on July 25, 2019

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