Thermal, optical, mechanical, and electrical properties of a novel NLO active Glycine potassium sulphate single crystals (original) (raw)
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Optical and Dielectric Properties of Glycine Fumarate NLO Single Crystal
Abstract: Single crystals of the Glycine Fumarate (GFA) were from the aqueous solution by slow evaporation method at room temperature. Single crystal X ray diffraction analysis reveals that the crystal belongs to orthorhombic crystal system. Optical transmission studies show that the crystal is transparent in the entire visible region with cut off wave length 252 nm .The optical band gap is found to be 3.872 eV. Mechanical hardness studies carried out to find the Hardness number of the grown crystal and it is increase with increase in applied load. Mayer index number was calculated for the grown up crystal and found that the materials belongs to the soft material category. Dielectric constant and the dielectric loss of material were calculated by using dielectric analysis at the room temperature. Further, electrical properties, such as Plasma energy, Penn energy, Fermi energy and electronic polarizability of the growth crystals have been predicated. The optical second harmonic generation conversion efficiency of GFA was determined by Kuntz powder technique and it shows that the material is the potential candidate for the NLO applications and its efficiency found to be 0.2 times that of KDP
International Journal of Advanced Science and Engineering, 2019
Single crystals of Diglycine Sulphate monohydrate (DGSM) have been grown by slow evaporation solution growth technique. The size of the grown crystals is 20x10x10mm3 with the duration of 25 days. To identify the cell parameter, space group and planes indexing the grown crystals were subjected to single & powder XRD. The different modes of vibrations present in the crystal were identified with FT- IR spectrum. The optical transmission, absorbance, extinction coefficient, Reflectance and refractive index have been studied to find its linear properties by UV-Vis spectroscopy. Band gap energy was calculated to be 4.71 eV. The dielectric constant, dielectric loss and AC conductivity has been measured as a function of frequency and temperature.
YMER Digital, 2022
Studies on dislocation & reactivity in organic crystalline materials play an important role in crystal growth, plasticity, crystal strength, ionic conductivity, electric conductivity & diffusion properties. The presence of dislocation governs or modifies a number of phenomenons. Etching behavior helps to understand surface characteristics & direction bonding. Studies on dislocations provide the information of ferroelectrics for the formation of domains. The interaction between domains and dislocation is not fully understood in organic ferroelectrics. Keeping this in view, crystalline materials were tried starting with amino acid having zwitter ions characteristics. In the present article Tri- Glycine Potassium Sulphate [NH2CH2COOH-K2SO4] single [GPS] crystal has been used for the study
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.
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.
Procedia Engineering, 2012
Single crystals of glycine doped potassium dihydrogen orthophosphate (KDP) were grown by Sankaranarayanan-Ramasamy (SR) method with have a size of 20 mm in diameter and 90 mm in length. The grown crystals were subjected to powder X-ray diffraction (XRD), differential scanning calorimeter (DSC), thermo-gravimetric analysis (TGA), optical transmission, dielectric and Vickers microhardness studies. The TGA of the samples reveal that the grown crystals were stable up to 200 C at least for all samples. The important optical parameters such as reflection and extinction coefficients of the grown crystal were calculated and discussed. The variation of dielectric constant, dielectric loss, a.c. resistivity and a.c. conductivity with frequency of applied field in the range from 1 kHz to 200 kHz was studied. The lower values of dielectric loss due to less of defect were observed in SR grown glycine doped KDP crystals. Vickers microhardness study shows higher mechanical stability in SR method grown crystals.
Thermal, mechanical, and electronic properties of glycine-sodium nitrate crystal
Journal of Physics and Chemistry of Solids, 2008
Glycine-sodium nitrate, C 2 H 5 N 2 NaO 5 (GSN), crystals were grown from aqueous solutions by slow cooling with a temperature lowering rate of 1 1C/day in the range of 40-22 1C. These crystals were analyzed by differential thermal and thermogravimetric analysis (DTA-TGA) and mechanical hardness tester in order to obtain their thermal and mechanical properties. Mechanical characterization was done by studying the variation of microhardness with applied load. The dielectric properties of GSN were calculated by using the CASTEP code within the framework of the generalized gradient approximation (GGA). For better understanding of the optical properties of GSN, the second derivative of e 2 (E) was evaluated. DTA-TGA analysis showed that the material has a thermal stability up to 198 1C. The microhardness test was carried out for several faces of GSN crystals, and the tests revealed a load dependence to hardness. Analysis of the second derivative of e 2 (E) allowed to obtain better resolution of the electronic transitions involving the energy bands. Besides, a theoretical representation of the orbitals' energy diagram was obtained. A discussion about the relation of structure-properties and molecular character of GSN is presented here.
DIELECTRIC PROPERTIES OF PURE AND NI 2+ DOPED GLYCINE SODIUM SULFATE CRYSTALS
Pure and Ni 2+ added glycine sodium sulfate (GSS) single crystals were grown by the slow evaporation technique and characterized chemically, structurally, thermally, optically, mechanically and electrically. Effect of Ni 2+ addition as an impurity on the properties of GSS has also been investigated. All the six crystals grown exhibit normal dielectric behavior and are found to be thermally stable up to 250˚C, NLO active and mechanically soft. The Ni 2+ addition is found to increase the dielectric parameters. The low dielectric constant values observed for pure GSS indicate that GSS is not only a promising NLO material but also a low dielectric constant value dielectric material.