International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Special Issue: 09 | Sep -2017
p-ISSN: 2395-0072
www.irjet.net
One Day International Seminar on Materials Science & Technology (ISMST 2017) 4th August 2017 Organized by
Department of Physics, Mother Teresa Women’s University, Kodaikanal, Tamilnadu, India
Investigations on the growth and characterization of NLO active Cadmium Picrate single crystal L. Ruby Nirmala1* 1*Assistant
Professor, Department of Physics, M.V.Muthiah Govt. Arts College for Women, (Affiliated to Mother Teresa Women’s University, Kodaikanal) Dindigul, Tamil Nadu, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Single crystal of Cadmium Picrate has been
interest in the technology of explosives chiefly because of the ease with which picric acid combines with many metals and basic compounds to form picrates, some of which are capable of direct detonation when subjected to heat or shock. Picric acid [10] and its complexes with amino acids, viz., l-prolinium picrate, l-valinium picrate and lasparaginium picrate and Glycine picrate show very high second harmonic generation efficiency [11-14]. Motivated by these considerations an attempt has been made to grow an another material such as cadmium Picrate single crystals.
grown from aqueous solution by slow evaporation solution growth technique. The lattice dimensions have been identified from single crystal and powder X-Ray diffraction measurements. The vibrational frequencies of various functional groups in the crystals have been confirmed by the FT-IR spectrum. Transmission range of the crystal has been determined by UV-Vis-NIR spectra. The mechanical stability of the grown crystal has been derived from Vickers micro hardness study. The dielectric response has been studied for different frequency ranges by parallel plate capacitor technique. The enhancement in the NLO property of the grown crystals using KDP crystal as a reference has been studied using SHG measurements.
2. EXPERIMENTAL PROCEDURE: MATERIAL SYNTHESIS AND CRYSTAL GROWTH
Key Words: X-ray diffraction;. Growth from solutions;
The saturated cadmium picrate solution was prepared by dissolving analar grade Picric acid (C6H3N3O7), and Cadmium Acetate (C4H6CdO42H2O) in Acetone. The saturated solution was stirred in a magnetic stirrer for 5 hours, to get homogenous mixture. The synthesized salt was taken and the saturated solution was prepared in accordance with the solubility data. Slow evaporation of the solvent at room temperature yielded many small crystals. The solution was then covered with a perforated polythene paper. The beaker containing the solution was kept in an undisturbed environment for slow evaporation. Transparent yellow colour Cadmium Picrate crystals were harvested in a growth period of 14 days as shown in Fig - 1. Best crystals were selected from the parent solution and it was used for characterization analysis.
Nonlinear optical materials; Dielectric materials.
1. INTRODUCTION The most efficient nonlinear optical (NLO) frequency conversion materials are the important requirement for many applications in the field of Photonics and optoelectronics [1–3]. More recent works have demonstrated that organic crystals will have very large nonlinear susceptibilities compared with that of inorganic crystals, but their uses are impeded by poor mechanical properties and the inability to produce large crystals. Purely inorganic NLO materials typically have excellent mechanical and thermal properties with relatively modest optical nonlinearities [4]. In view of this, a new approach has been developed to combine the favorable aspects of both organic and inorganic molecules to form semi-organic compounds. In semi-organics, polarizable organic molecules are stoichiometrically bound within an inorganic host [5]. Picric acid (2,4,6-trinitrophenol) is an organic acid, which is used in the dyeing industry and as an explosive. The presence of three electrons withdrawing Nitro groups make it as a good acceptor for neutral carrier donor molecule [6-8]. The metal derivatives of picric acid are helpful in homeopathic medicine and it shows the extraordinary variety in the bonding of metal salts and complexes [9]. The explosive characteristics of the metallic salts of picric acid are of © 2017, IRJET
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Impact Factor value: 5.181
Fig - 1: As grown Cadmium picrate crystal
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