Mechanics, Materials Science & Engineering, May 2017
ISSN 2412-5954
Effects of Manganese (Ii) Sulphate on Structural, Spectral, Optical, Thermal and Mechanical Properties of L-Alanine Sodium Sulphate Single Crystals19 F. Praveena1, S.L. Rayar2 1
Department of physics, M.E.T.Engineering College, chenbagaramanputhoor, Tamilnadu, India
2 DOI 10.2412/mmse.56.71.446 provided by Seo4U.link
Keywords: LASS, FT-IR, TG-DTA, sodium sulphate single crystals.
ABSTRACT. New Non-linear Optical materials have been attracting in the research world for their potential applications in emerging opto-electronic technology. The dipolar nature of amino acid leads to peculiar physical and chemical properties, thus making a good candidate for NLO applications. Single crystals of manganese (II) sulphate doped LAlanine sodium sulphate(LASS) has been synthesized by slow evaporation technique. Structural property of the grown crystals are characterized by X-ray powder diffraction,FT-IR spectral analysis conforms all the functional groups.Thermogravity(TG) and differential themogravimetric(DTA) analysis have been performed to study the thermal stability of the crystals. The second harmonic generation efficiency was measured by Kurtz-Perry powder technique. The transmission and absorption of electromagnetic radiation is analysed through UV-VIS spectrum. Microhardness was measured at different applied load to understand the mechanical stability of the crystal.
Introduction. Non-linear optical materials are used in several practical applications in telecommunication, optical computing, optical data storage and processing, laser technology and in many other fields. Today research is focused on searching new semi organic nonlinear optical (NLO) materials, as they share the advantages of both inorganic (high thermal and mechanical stability) and organic (broad optical frequency range and second harmonic conversion efficiency) materials. Alanine is an amino acid, which is an important source of energy for muscle tissue, the brain and central nervous system. L-alanine is an isomer of alanine with the chemical formula CH3CHNH2COOH next to glycine. L-alanine molecule can exist in zwitterionic form and it can form novel nonlinear optical (NLO) compounds [1-2].They contain proton donar carboxyl acid (-COO) group and the proton acceptor amino (NH2) group in them [3]. These versatile behaviours of amino acid based organic crystal attract the researchers towards crystal growth of NLO crystals. The complexes of amino acids and salts are promising materials for optical second harmonic generation (SHG) [4]. Recently also optical, spectral and second harmonic generation studies were carried out on L-Alanine based materials [5-8]. In this work, the manganese (II) sulphate is introduced into the lattice of L-alanine sodium sulphate crystals to alter the structural, spectral, thermal, optical and mechanical properties of LASS crystal and analysed. Characterization studies such as powder XRD, EDAX, FTIR were done. Kurtz and Perry SHG test confirms the NLO property of the grown crystals.Hardness values are found out by Vickers hardness test. Synthesis and growth of the crystal. Analytical reagent (AR) grade L-alanine, sodium sulphate(Na2SO4) and manganese(II) sulphate monohydrate (MnSO4.H2O) were used along with double distilled water (as a solvent) for the growth of single crystals by the slow evaporation method. L-alanine and Sodium sulphate mixed in 1:1 molar ratio were dissolved in double distilled water and stirred for four hours to obtain a homogeneous solution. The solutiobn was filtered and kept in a dust free environment. Transparent and colorless single crystals of L-alanine sodium sulphate (LASS) The Authors. Published by Magnolithe GmbH. This is an open access article under the CC BY-NC-ND license http://creativecommons.org/licenses/by-nc-nd/4.0/
MMSE Journal. Open Access www.mmse.xyz
110