Faculty Publications

Permanent URI for this communityhttps://idr.nitk.ac.in/handle/123456789/18736

Publications by NITK Faculty

Browse

Author: search.filters.author.Pujar, S.Subject: search.filters.subject.Oxalic acid dihydrate

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Effect of methyl orange dye molecule on the structural, optical and electrical properties of the KHOOD single crystals
    (Springer, 2020) Mahendra, K.; Pujar, S.; Udayashankar, N.K.
    In the present investigation, synthesis of pristine and methyl orange dye-doped potassium hydrogen oxalate oxalic acid dihydrate (KHOOD) single crystals are reported. In this study, the structural properties of the crystals were investigated using powder XRD and the effect of dye incorporation on the KHOOD crystal was explored in detail. The effect of dye molecule on the optical absorption of the crystal was studied and the optical band gap was calculated using Tauc relation and presented in detail. Further, the effect on emission and mechanical properties of the crystals were also explored after doping with the dye molecule. Furthermore, the crystals were also studied electrically by subjecting to varying electrical frequencies (A.C) and the properties of pristine and doped crystals were compared and explained in detail. The modulus properties of the crystals were studied and compared. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
  • No Thumbnail Available
    Item
    Systematic investigation and comparison of oxalic acid dihydrate, ammonium oxalate hydrate and ammonium hydrogen oxalate oxalic acid dihydrate single crystals
    (Elsevier Ltd, 2023) Mahendra, K.; Fernandes, B.J.; Pattar, J.; Pujar, S.; Nagaraja, B.S.; Ramesh, K.P.; Udayashankar, N.K.
    Semiorganic crystals are hybrid materials that have captured the interest of researchers due to their improved material characteristics and applications. In the current work, single crystals of oxalic acid dihydrate (OAD), Ammonium oxalate hydrate (AHO), and Ammonium hydrogen oxalate oxalic acid dihydrate (AHOOD) were grown using a slow evaporation method. Single crystal and powder XRD measurements were carried out to elucidate their unit cell parameters, crystal system, and structural information. To comprehend the interplay of light and matter, optical investigations like UV–Vis Spectroscopy and photoluminescence studies were performed. Interaction of ammonium with oxalic acid, and thus formed crystals, was investigated using impedance spectroscopy. Detailed dielectric parameters such as dielectric constant, dielectric loss, impedance, conductivity, and electric modulus were explored as a function of frequency. Vickers hardness test was used to calculate the hardness, Meyer's number, brittleness, and fracture toughness. The crystals were determined to be of the hard materials group. © 2022 Elsevier B.V.