Crystal growth, thermal and optical studies of nonlinear optical material: Glycine potassium sulphate (original) (raw)
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Growth, optical, thermal and electrical properties of nonlinear optical -glycine single crystal
Scientific Research and Essays, 2015
Single crystal growth of γ-glycine has been grown by solution growth technique. The lattice parameters and crystal system of the grown crystals were confirmed by single crystal X-ray diffraction analysis. The functional groups present in the grown crystal were identified by FT-IR spectral analysis. The optical property of the γ-glycine crystal is studied by UV-Visible spectrum. Optical constants such as band gap, refractive index, extinction coefficient and electrical susceptibility were calculated to analyze the optical property from UV-Visible spectrum. The thermal analyses revealed good thermal stability of the material thus proving its suitability for NLO applications. The second harmonic generation (SHG) test has been confirmed by the Kurtz powder test. The dielectric studies of γ-glycine crystal were studied in the different frequency and different temperatures. Photoconductivity measurements were carried out in order to reveal the negative photoconductivity of the γ-glycine crystal.
Optik, 2013
Single crystals of the organic nonlinear optical material ␥-glycine have been grown in the presence of Zinc sulphate by slow evaporation technique at ambient temperature for the first time. Bulk growth of ␥-glycine single crystals was grown by Top-seeded solution growth method. The ␥-phase of glycine was confirmed by powder X-ray diffraction and the FTIR analysis. Elemental analysis CHN was performed to confirm the non-inclusion of zinc sulphate species into the solution. Inductively coupled plasma optical emission spectrometry study (ICP-OES) was employed to quantify the concentration of Zinc element in the grown ␥-glycine single crystals. The optical transmission was ascertained from UV-Vis-NIR spectrum. The optical band gap was estimated for ␥-glycine single crystal using UV-Vis-NIR study. Differential scanning calorimetry analysis was employed to explore information about thermal stability, phase transition and melting point of the grown crystal. The second harmonic generation relative efficiency was measured by Kurtz and Perry powder technique.
Structural, dielectric and piezoelectric properties of nonlinear optical γ-glycine single crystals
Physica B Condensed Matter
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 g-glycine crystal was confirmed by X-ray diffraction technique. It was found to crystallize in the trigonal system with space group P3 1. The chemical composition was determined by NMR. Fourier transform infrared studies revealed the functional groups present in the grown crystal and UV-vis-NIR 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 energydispersive spectrometry (EDS). The second-order nonlinear optical property of the material was investigated by Kurtz powder technique and the relative second harmonic efficiency of g-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 (d 33) 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.
Hydrogen bonded nonlinear optical γ-glycine: Crystal growth and characterization
Journal of Crystal Growth, 2005
Single crystals of g-glycine(GG) were grown by solvent evaporation technique from a mixture of aqueous solutions of glycine and ammonium nitrate at ambient temperature. X-ray diffraction, thermogravimetric/differential thermal analysis, Fourier transform infrared spectral techniques were employed to characterize the crystal. The lattice parameters were calculated and they agree well with the reported values. GG exists as dipolar ions in which the carboxyl group is present as a carboxylate ion and the amino group as an ammonium ion. Due to this dipolar nature, glycine has a high decomposition temperature. The UV cutoff of GG is below 300 nm and has a wide transparency window, which is suitable for second harmonic generation of laser in the blue region. Nonlinear optical characteristics of GG were studied using Q switched Nd:YAG laser (l ¼ 1064 nm). The second harmonic generation conversion efficiency of GG is 1.5 times that of potassium dihydrogen phosphate. The X-ray diffraction and Fourier transform infrared spectral studies show the presence of strong hydrogen bonds which create and stabilize the crystal structure in GG. The main contributions to the nonlinear optical properties in GG results from the presence of the hydrogen bond and from the vibrational part due to very intense infrared bands of the hydrogen bond vibrations. GG is thermally stable up to 441 K.
Journal of Materials Science: Materials in Electronics, 2020
Organic nonlinear optical L-phenylalanine D-mandelic acid (LPDMA) single crystals have been harvested adopting slow solvent evaporation solution growth technique (SSEST) with growth period of 15 days. The XRD studies of the crystal confirm the non-centrosymmetric nature of the crystal. The presence of functional groups for the formation of the compound was confirmed by Fourier Transform Infrared (FTIR) analysis. The UV-Visible spectral studies ascertained linear optical quality and estimation of optical parameters. The nonlinear optical property was studied from Kurtz-Perry powder technique and Z-scan technique. The quantum chemical calculations such as HOMO-LUMO and Molecular Electrostatic Potential (MEP) were calculated and presented. In order to find out various mechanical parameters such as Vicker's hardness number (H v), Mayer's index (n), yield strength (r y) and stiffness constant (C 11), Vicker's microhardness tester was utilized.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011
Single crystals of ␥-glycine, an organic nonlinear optical material have been synthesized in the presence of potassium fluoride (KF) by slow evaporation technique at ambient temperature. The size of the grown crystal is up to the dimension of 12 mm × 10 mm × 8 mm. The ␥-phase was confirmed by single crystal X-ray diffraction, powder XRD and the FTIR analysis. Optical absorption spectrum reveals that the grown crystal has good optical transparency in the entire visible region with an energy band gap of 5.09 eV, which is an essential requirement for a nonlinear optical crystal. Thermal stability of the grown ␥-glycine crystal was determined using the thermo gravimetric and differential thermal analyses. The NLO activity of ␥glycine was confirmed by the Kurtz powder technique using Nd:YAG laser and the grown crystal exhibits high relative conversion efficiency when compared to potassium dihydrogen phosphate (KDP).
Semi-organic single crystals of glycine potassium sulphate were synthesized by a slow evaporation technique. Good quality single crystals with size 6.02mm x 2.63mm x 1.81mm were grown in 32 days. Single crystal and powder XRD analyses confirmed the orthorhombic crystal structure. Vibration spectrum was recorded to determine the symmetries of molecular vibrations. The TGA, DTA shows that the material has good thermal stability; the UV-Vis spectrum shows the transmitting ability of the crystal in the entire visible region. The dielectric constant and dielectric loss were calculated by varying frequencies at different temperature. The microhardness test reveals that the crystals possess good mechanical strength.
Comparative Study of Nonlinear Semi-Organic Crystals: Glycine Sodium Nitrate
International Letters of Chemistry, Physics and Astronomy, 2015
Glycine Sodium Nitrate (GSN) crystals were grown using slow evaporation technique at ambient temperature. Good quality crystals were obtained in the time interval of 5-6 weeks. Energy Dispersive X-ray Analysis (EDAX) and CHN analysis were carried out to check the purity of the grown crystals. Surface morphologies, smoothness and defects were observed by scanning electron microscope. GSN crystals were characterized by powder X-ray diffraction and indexing was done based on monoclinic system. UV-Vis study of the crystals showed that there is a wide range of transparency in the visible region. We also studied Raman and Fourier transform infrared spectra of GSN crystals. The results and their implications are discussed in the paper in detail.
GROWTH AND CHARACTERIZATION OF PURE AND NI 2+ DOPED GLYCINE SODIUM SULFATE CRYSTALS
Single crystals of glycine sodium sulfate (GSS), a new semi-organic nonlinear optical (NLO) material, have been grown by the free evaporation method and characterized chemically, structurally, thermally, optically and mechanically. Effect of Ni 2+ addition as an impurity on the properties of GSS has also been investigated. X-ray diffraction analysis indicates the crystal system as monoclinic. The functional groups have been identified using Fourier transform infrared spectral analysis. The crystals are found to be thermally stable up to 250˚C. The UV-Vis-NIR spectral analysis shows that these crystals have their cut off wavelengths around 250nm. Second harmonic generation (SHG) measurement shows the NLO property. Micro hardness measurement indicates that GSS comes under soft material category. The Ni 2+ addition is found to increase the optical transparency and micro hardness whereas it decreases the second harmonic generation efficiency.