GLS crystals were grown with the optimized growth parameters. The formation of GLS compounds was confirmed by powder X-ray diffraction studies. Metastable zone width and induction period values have been determined in order to optimize the growth parameters. The interfacial tension values estimated using the experimentally determined induction period are found to be comparable with theoretical values. The density measurements were carried out by both theoretical and experimental methods. The NLO property of GLS crystals has been inferred by Kurtz- Perry technique. The mechanical hardness was tested by Vickers Microhardness tester.

Introduction

Materials with non-linear electro-optic properties have wide applications in modern optical and optoelectronic devices. Organic crystals possess high efficiency of frequency conversion, moderately high damage threshold, wide range of transparency. GLS crystallizes in orthorhombic structure with space group of Pna2₁. The study of the growth defects includes the defects such as inclusions, step growth, mechanical stress etc., which are due to poor control of crystal growth parameters. In the present study investigations have been made to evaluate the interfacial tension (γ), between the GLS (solute) and water based solution by measuring the induction period (τ) and hence to calculate critical radius (r*), number of molecules in the critical nucleus (i*) and Gibb’s free energy (∆G*) for the formation of GLS.

Growth of GLS

GLS has got good solubility in water; the crystals were grown by slow cooling method. Saturated solution of GLS was prepared and extreme care was taken towards maintenance of temperature; even minor fluctuations in temperature will lead to inclusions and defects in the growing crystals. The beaker containing solution was kept in the constant temperature bath controlled to an accuracy of ± 0.1°C. The temperature was lowered at the rate of 0.5ºC/day and the crystals of GLS have been obtained (Fig).

Powder X-ray diffraction analysis

The powder sample of GLS was subjected to powder XRD analysis and the recorded XRD pattern is shown in Fig. The obtained powder X-ray diffraction data were analyzed by using PROSZKI software package and the lattice parameters were calculated. It is confirmed that GLS belongs to orthorhombic crystal system with space group Pna2₁. The cell parameters were found to be a=16.423Å, b=5.005Å and c=7.654Å.

Nonlinear optical properties

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/9732 must be provided.

1. Characterization of swift heavy ion induced modification on the nonlinear optical Benzimidazole (BMZ) single crystals
2. Growth and characterization of NLO-N-Bromosuccinimide (NBS) single crystals
3. Swift heavy ion induced modification on the Optical, Mechanical and Dielectric behaviour of GLS single crystals
4. Growth of Unidirectional Semi-organic and Inorganic single crystals from solution by Sankaranarayanan-Ramasamy (SR) method and their characterization
5. Growth And Characterization of Nonlinear Optical L-Asparaginium Picrate Single Crystals.