Hydrogen bonded nonlinear optical γ-glycine: Crystal growth and characterization (original) (raw)
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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.
Synthesis, bulk growth, polarizability and nonlinear optical properties of γ-glycine single crystals
Crystal Research and Technology, 2015
The role of sodium acetate, sodium nitrate, sodium hydroxide and malonic acid as additives in assisting the nucleation of γ-polymorph from solution has been investigated. For the first time large dimensional bulk single crystals of γglycine have been grown at the optimized concentration of the additives by the top seeded slow cooling technique. The bulk growth of single crystals elucidates well the unidirectional growth characteristics and the existence of merohedral twinning in γ-glycine. Polarizability, plasmon energy and Fermi energy has been evaluated for the first time for γ-glycine single crystals based on an analytical approach. Structural affirmation of the nucleated polymorph has been carried out by Powder x-ray diffraction and the thermal characteristics of the nucleated polymorph are well revealed by Differential Scanning Calorimetry. The non linear optical characteristics of γ-glycine studied by Kurtz and Perry technique revealed increased SHG efficiency with the highest of about 2.2 in the presence of malonic acid compared to the standard Potassium dihydrogen orthophosphate (KDP).
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.
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.
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).
Laser induced phenomena in γ -glycine crystals
The photoinduced changes of absorption within the spectral range 200–800 nm and optical second harmonic generation caused by illumination by the cw second harmonic generation of the Nd:YAG laser (λ = 532 nm) and power about 400 mW were investigated. We have established that increasing the time of illumination by the second harmonic generation of the Nd:YAG laser leads to the occurrence of one strong spectral minimum at 319 nm and another less strong at 420 nm. Increasing the time of illumination leads to a slight red spectral shift of the photoinduced minima. The absence of a substantial increase in temperature indicates that the principal role is played here by the photooccupation of the trapping levels. The effect is observed in a wide spectral range of the incident photoinduced angles, however, the beam should possess a good Gaussian-like form and to be space homogenous. The results were reproduced with precision up to 3–4% which was achieved due to additional stabilization of th...
Journal of Physics and Chemistry of Solids, 2006
A new nonlinear optical material glycine potassium sulphate (GPS) has been synthesized and optical quality crystals were grown from aqueous solution. This material has positive temperature coefficient revealed from the solubility studies. The grown crystals were characterized by employing several techniques such as single crystal and powder X-ray diffraction, thermo gravimetric analysis, FTIR and UV-vis-NIR spectra. The etching studies have been done on the (1 0 0) plane of the grown crystal. Preliminary measurements to find second harmonic generation efficiency of GPS has been carried out.
Growth of gamma glycine crystal and its characterisation
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2010
Single crystal of ␥-glycine, an organic nonlinear optical material, has been grown by solvent evaporation technique from a mixture of aqueous solutions of glycine and potassium nitrate, lithium nitrate at room temperature. Gamma glycine crystals have been grown up to the dimension of 20 mm × 15 mm × 12 mm. Powder X-ray diffraction of the grown crystal was recorded and indexed. Single crystal X-ray diffraction studies were carried out and the unit cell parameters were compared with the literature values. The ␥-phase of glycine is confirmed by single crystal XRD and FTIR spectral analysis. The crystals were characterised by UV-vis-NIR transmission spectrum in the range 200-1100 nm. The second harmonic generation conversion efficiency of ␥-glycine crystal was twice the efficiency of KDP crystal. Thermal characteristics of ␥-glycine crystals were determined by thermogravimetric analysis (TGA) and differential thermal analysis, which shows the thermal stability of the grown crystals. Dielectric constant and dielectric loss measurements were carried out at different temperatures and frequencies. The microhardness of the grown crystals has been studied using Vicker's microhardness tester.
Journal of Molecular Structure, 2020
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