Single crystals of γ-glycine in the presence of cesium chloride were grown from aqueous solution by low temperature solution growth technique. The phase purity and crystal structure of the grown crystals were confirmed by Powder X-ray diffraction analysis. The presence of functional groups were confirmed by FT-IR spectrum. Thermal analysis of the grown crystal was determined by thermogravimetric and differential thermal analysis (TG/DTA), which results the thermal stability of the grown crystal. The optical absorption and lower cut-off values were ascertained by recorded UV-Visible spectrum of γ-glycine crystals. The existence of second harmonic generation efficiency of frequency doubling was found to be 6 times greater than that of KDP. © 2014 WILEY-VCH Verlag GmbH &amp; Co. KGaA, Weinheim.

Ezhil Vizhi R

Department of Physics

School of Advanced Sciences

Vellore Campus

Rajan Babu D

Yogambal C

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Crystal Research and Technology

A nonlinear optical material γ-glycine single crystal was grown for the first time in the presence of sodium bromide by slow cooling method. The solubility of the material was analyzed gravimetrically. Metastable zonewidth was studied by the polythermal method. The form of crystallization was confirmed by powder X-ray diffraction analysis. The crystal of γ-glycine were found to crystallize in hexagonal crystal system. The presence of all the functional groups of the γ-glycine was confirmed by FT-IR and FT-Raman spectral analysis. Thermal properties of the grown crystal were determined by thermo-gravimetric analysis (TGA) and differential thermal analysis (DTA), which indicated the thermal stability (up to 210 °C) and the melting point (257 °C). The grown crystal was subjected to Vickers microhardness test. The dielectric response of the sample is studied as a function of frequency and temperature. The optical transparency and lower cut-off value of UV transmission (223 nm) were ascertained by recording a UV–visible spectrum of γ-glycine crystal. The second-order nonlinear optical property was confirmed by Q-switched Nd:YAG laser. © 2016 Elsevier B.V.

Journal of Crystal Growth

Investigations on the growth and characterization of γ-glycine single crystal in the presence of sodium bromide

Single crystals of γ-glycine were grown by slow evaporation technique. The crystalline system was confirmed by single crystal X-ray diffraction analysis. The optical absorption study has shown that the grown crystal possesses lower cut-off wavelength. Solubility and metastable zone width were estimated for different temperatures. The induction period of title compound was determined by varying the temperature and concentration. Nucleation parameters such as Gibbs volume free energy change (ΔGv), interfacial tension (γ), critical free energy change of the nucleus (ΔG*), nucleation rate (J), number of molecules in the critical nucleus (i*) have been calculated for the aqueous solution grown γ-glycine single crystals. The second harmonic generation (SHG) of γ-glycine was confirmed by Q-switched Nd:YAG laser technique. © 2013 Elsevier B.V.

Physica B: Condensed Matter

Investigations on the nucleation kinetics of γ-glycine single crystal

Single crystals of the nonlinear material γ-glycine have been grown in the presence of lithium nitrate by slow-evaporation method. Structural characterization of the grown crystals was carried out by powder and single crystal X-ray diffraction (XRD) methods and it is observed that the samples crystallize in hexagonal system with non-centrosymmetric space groups. The modes of vibrations of different molecular groups present in glycine have been identified by spectral analyses. UV-visible transmittance study was performed to analyze optical transparency of γ-glycine crystals and found that the crystal was transparent in the entire visible-NIR region. Second harmonic generation (SHG) conversion efficiency has been estimated as 62 mV and the output power by the crystal was 1.72 times that of potassium dihydrogen phosphate (KDP) crystal. The thermal stability and decomposition of the sample have been studied by thermal analysis and it is observed that the γ-glycine crystal have good thermal stability. © 2011 Elsevier GmbH.

Optik

Crystal growth, optical and thermal studies of nonlinear optical γ-glycine single crystal grown from lithium nitrate

Gamma glycine was synthesized and the single crystals were grown by the slow evaporation method in the presence of lithium nitrate. Structure and crystalline nature of the grown γ-glycine crystal was confirmed by X-ray diffraction technique. It was found to crystallize in the trigonal system with space group P31. The chemical composition was determined by NMR. Fourier transform infrared studies revealed the functional groups present in the grown crystal and UVvisNIR spectra revealed the transmission properties of the crystal specimen. Surface morphology of the grown crystal was studied by scanning electron microscopy (SEM) and elemental composition was confirmed by energy-dispersive spectrometry (EDS). The second-order nonlinear optical property of the material was investigated by Kurtz powder technique and the relative second harmonic efficiency of γ-glycine was estimated to be higher than that of KDP. The dielectric measurement was carried out as a function of frequencies at room temperature and the results were discussed. The samples have shown piezoelectric behavior with a fairly good piezoelectric charge coefficient (d33) of 7.37 pC/N. Photoluminescence studies showed emission peak around 350 nm. Thermo gravimetric and differential thermal analyses were employed to understand the thermal and physio-chemical stability of the synthesized compound. © 2011 Elsevier B.V. All rights reserved.

Structural, dielectric and piezoelectric properties of nonlinear optical γ-glycine single crystals

This work investigates the influence of iron doping on Potassium Hydrogen Phthalate (KHP) single crystals by the slow evaporation solution growth technique. Factors such as evaporation rate, solution pH, solute concentration, super saturation limit, etc. are very important in order to have optically transparent single crystals. As part of the work, the effects of metallic salt FeCl3 in different concentrations were analyzed with pure KHP. Powder X-ray diffraction suggests that the grown crystals are crystallized in the orthorhombic structure. The functional groups and the effect of moisture on the doped crystals can be analyzed with the help of a FTIR spectrum. The pure and doped KHP single crystal shows good transparency in the entire visible region, which is suitable for optical device applications. The refractive indices along b axis of pure and doped KHP single crystals were analyzed by the prism coupling technique. The emission of green light with the use of a Nd:YAG laser (λ=1064 nm) confirmed the second harmonic generation properties of the grown crystals. © 2010 Elsevier B.V. All rights reserved.

Journal	Data powered by TypesetCrystal Research and Technology
Publisher	Data powered by TypesetWiley
ISSN	0232-1300
Open Access	0