Growth and characterization of urea-oxalic acid crystals by solution growth technique

¹ Department of Physics, Dhanalakshmi College of Engineering, 601301 Chennai, India
² Department of Physics, Loyola College, 600034 Chennai, India
³ Department of Physics, B.S. Abdur Rahman University, 600048 Chennai, India
⁴ Department of Chemistry, Dhanalakshmi College of Engineering, 601301 Chennai, India

^a e-mail: skrishnanjp@gmail.com

Received: 26 February 2013
Revised: 5 September 2013
Accepted: 6 September 2013
Published online: 15 November 2013

Abstract

Single crystals of urea-oxalic acid (UOA) have been grown from aqueous solution by slow evaporation technique. Single crystal X-ray diffraction analysis confirmed that the grown crystals belong to monoclinic system having space group P₂₁/C. The presence of functional groups was confirmed by using Fourier transform infrared (FTIR) spectroscopy. Optical absorption studies show very low absorption in entire visible region and the UV cut-off is found to be around 240 nm. Thermal analysis studies were carried out using TG/DTA analysis and the grown crystal is thermally stable up to 180 °C. Dielectric constant studies confirm the ferroelectric property of the materials and very low dielectric loss reveals very high purity of the crystal.