www.ijcrt.org © 2018 IJCRT | Volume 6, Issue 2 April 2018 | ISSN: 2320-2882 IJCRT1892138 International Journal of Creative Research Thoughts (IJCRT) www.ijcrt.org 898 GROWTH AND CHARACTERIZATION OF UREA-THIOUREA DOPED TRIGLYCINE SULPHATE SINGLE CRYSTALS B.Leema Rose 1 ,S.Narayana Kalkura 2 and C.Gnanasampantham 1* 1.Department of physics Research centre, S.T. Hindu college , Nagercoil, TamilNadu, India 2.Crystal Growth center,Anna University,Chennai ABSTRACT Ferroelectrics are an important class of electronic materials. Due to the demand of highly sophisticated radiation and thermal detectors,electro-optical devices,imaging,recording and other important applications in various sophisticated instrumentations, this field has gained significantly in its scientific and technological values. Glycine derivative ,triglycine sulphate (TGS) , a well known ferroelectric reflects a large pyroelectric coefficient and a high Volt/Watt sensitivity put in to thermoelectric detector. In the present study 0.5mole % urea(NH2-CO-NH2) and 0.5 mole% thiourea(NH2-CS-NH2) was put together and used as the double dopant.A single crystal with well defined crystal morphology was obtained.The grown crystal was characterized for their morphological,structural,optical, SEM,EDAX and non-linear optical properties. Keywords Amino acids,Urea,Thiourea, chiral carbon, non-centro symmetric, hydrophilic. 1.INTRODUCTION In nature about 300 aminoacids occur. Most of the aminoacids are alpha aminoacids,which means that the amino group is attached to the same carbon atom which the carboxyl groups is attached. Generally aminoacids having an asymmetric carbon atom exhibit optical activity.Asymmetry arises when 4 different groups are attached to the same carbon atom. Aminoacids posses second harmonic generation because of the chiral carbon atom and crystallizes in non-centro symmetric space groups. Among the twenty aminoacids , based on the structure, Glycine is the simplest aminoacid, hydrophilic in nature and has no asymmetric carbon atom and therefore shows no optical activity.To get non centro symmetric space groups selective acids such as sulphuric acid, phosphoric acids are used to convert glycine into non centro symmetric space group. Triglycine sulfate (TGS) (CH2NH2COOH)3·H2SO4, a ferroelectric discovered in 1956[1]. This noval material may be considered a unique material for pyroelectric uses [2,3]. TGS undergoes second order phase transition from paraelectric to ferroelectric state at Tc , 322 K which is followed by change of structural space group of symmetry from P21/m to P21.Lattice parameters of TGS at room temperature are a = 9.392 Å, b = 12.734 Å, c = 5.784 Å and monoclinic angle β = 109.45 º [4]. 2.EXPERIMENTAL 2.1. Materials Analar grade glycine, Concentrated sulphuric acid , and triple distilled water were used for the synthesis of TGS. Urea and Thiourea were used as the double dopants.