• M Haris

      Articles written in Pramana – Journal of Physics

    • Characterization of pure and copper-doped iron tartrate crystals grown in silica gel

      V Mathivanan M Haris

      More Details Abstract Fulltext PDF

      Single crystal growth of pure and copper-doped iron tartrate crystals bearing composition Cu$_{x}$ Fe$_{(1−x)}$ C4H4O6 · $n$H2O, where $x = 0, 0.07, 0.06, 0.05, 0.04, 0.03$, is achieved using gel technique. The elemental analysis has been done using energy-dispersive X-ray analysis (EDAX) spectrum. The characterization studies such as Fourier transform infrared spectroscopy (FTIR), powder X-ray diffraction (XRD), magnetic analysis and thermal analysis have been done for crystals with $x = 0$ for pure iron tartrate and with $x = 0.05$ for copper-mixed iron tartrate crystals. A detailed comparison has been made between pure and doped crystals.

    • Synthesis and characterization of gel-grown cobalt tartrate crystals

      V M Athivanan M Haris T Prasanyaa M Amgalan

      More Details Abstract Fulltext PDF

      Crystals of cobalt tartrate are grown from the gel using chemical reaction method. The functional groups are found from Fourier transform infrared spectroscopy (FTIR). The OH stretching mode owing to water, carbonyl group, CH stretching modes and metal–oxygen stretching are identified. The unit cell dimensions, interaxial angles and unit cell volume are found from powder X-ray diffraction studies (XRD) which show the orthorhombic nature of the crystal. The magnetic study is used to find the magnetic susceptibility and magnetic moment of the grown crystal. It reveals the magnetic nature of the crystal. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) are done to find the thermal properties of the crystal which manifest the water of hydration in the crystal. The variation of dielectric constant with respect to the applied frequency shows the polarization property of the crystal. The AC conductivity is increased proportionally with increase in frequency. The reverse nature is found for the AC resistivity. The nature of the composition of the crystals affects the dielectric properties.

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