Growth and characterization of semi-organic nonlinear optical crystals of l-leucine hydrochlorobromide (LEHCBr)

2015 ◽  
Vol 93 (8) ◽  
pp. 836-840
Author(s):  
R. Omegala Priakumari ◽  
S. Grace Sahaya Sheba ◽  
M. Gunasekaran
Keyword(s):  
Single Crystal ◽  
Nonlinear Optical ◽  
Dielectric Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Ft Ir ◽  
Ir Analysis ◽  
Dta Curves

l-Leucine hydrochlorobromide (LEHCBr), a semi-organic nonlinear optical material, was synthesized and grown as single crystal by slow evaporation method at ambient temperature. The powder X-ray diffraction pattern of the grown LEHCBr crystal was indexed and compared with single crystal X-ray diffraction data. Functional groups present in the sample were identified by FT-IR analysis. The grown crystal shows a cut off wavelength of 247 nm from the recorded UV–vis–IR spectrum. The thermal stability and melting temperature of LEHCBr were determined from TGA/DTA curves. The Vickers hardness was evaluated to be 71.9 kg/mm2 using Vickers microhardness tester. The dielectric behavior of the crystal was studied at different temperatures. The positive photo conducting nature of the LEHCBr crystal was confirmed by photoconductivity study. The Kurtz–Perry powder study revealed the SHG efficiency of LEHCBr as 4.6 times higher than that of KDP.

scholarly journals Studies on the growth and characterization of L-cysteine hydrogen fluoride single crystal

2019 ◽  
Vol 37 (3) ◽  
pp. 304-309
Author(s):  
Azeezaa Varsha Mohammed ◽  
Suresh Sagadevan
Keyword(s):  
Single Crystal ◽  
Hydrogen Fluoride ◽  
Grown Crystal ◽  
Optical Band Gap ◽  
Second Harmonic ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Ft Ir

AbstractL-cysteine hydrogen fluoride (LCHF) single crystals were grown from aqueous solution. Single crystal X-ray diffraction, FT-IR, UV-Vis-NIR, and TG-DTA were used to test the grown crystals. The specimen dielectric and mechanical behaviors were also studied. Powder X-ray diffraction of the grown crystal was recorded and indexed. The optical properties of the LCHF crystal were determined using UV-Vis spectroscopy. It was found that the optical band gap of LCHF was 4.8 eV. The crystal functional groups were identified using FT-IR. Second harmonic generation (SHG) efficiency of the LCHF was three times higher than that of KDP. The dielectric constant, dielectric loss and AC conductivity were measured at different frequencies and temperatures.

scholarly journals Synthesis, growth and characterization of NaAl(SO4)·H2O triangular prism single crystal for inorganic NLO application

2019 ◽  
Vol 37 (2) ◽  
pp. 142-148
Author(s):  
P. Sakthi ◽  
R. Rajasekaran ◽  
A. Arun
Keyword(s):  
Dielectric Loss ◽  
Single Crystal ◽  
Grown Crystal ◽  
Triangular Prism ◽  
X Ray Diffraction ◽  
Low Dielectric ◽  
Different Temperatures ◽  
Evaporation Technique ◽  
Ft Ir

AbstractAn inorganic coordination complex of single crystal containing sodium and aluminum (SA) was grown at room temperature by slow evaporation technique. The crystal was characterized using single crystal X-ray diffraction (XRD), FT-IR, UV-Vis, SHG, SEM, EDX and TG/DTA analyses. The size of the grown crystal was around 17 mm × 15 mm × 5 mm. Both optical and SEM photographs confirmed that the crystal is transparent with smooth surface. The XRD data showed that the crystal belongs to the BCC crystal structure. The crystal shows excellent transparency in the entire region of visible light (cut-off value is 339 cm−1). The dielectric constant as well as dielectric loss of the sample was calculated by varying frequencies at different temperatures and the presence of low dielectric loss proved that this crystal can be used for the NLO application.

Development of Biogenic Silver Nanoparticle Using Rosa Chinensis Flower Extract and Its Antibacterial Property

2016 ◽  
Vol 16 (4) ◽  
pp. 3969-3972 ◽  
Author(s):  
Yongde Meng ◽  
Yanjie Sun
Keyword(s):  
Silver Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rosa Chinensis ◽  
Flower Extract ◽  
Transmission Electron ◽  
Ft Ir ◽  
Ir Analysis ◽  
The Fourier Transform

In the present study, biosynthesis of silver nanoparticles was carried out using Rosa chinensis flower extract as reducing agent. The characterization of silver nanoparticles was done by UV-VIS spectrum. The morphology and size of silver nanoparticles were determined by transmission electron microscope (TEM) image. The crystallization of silver nanoparticles was confirmed by X-ray diffraction (XRD) measurements. The Fourier transform infrared (FT-IR) analysis was used to confirm the possible involvement in the formation and stabilization of synthesized silver nanoparticles by the extract of Rosa chinensis flower. Antibacterial activity of silver nanoparticles was studied against Gram positive Staphycoccus aureus and Gram negative Escherichia coli.

Synthesis and characterization of Cu(II)-halide 1-methylimidazole complexes

2016 ◽  
Vol 71 (2) ◽  
pp. 105-112 ◽  
Author(s):  
Michael Hörmannsdorfer ◽  
Ulrike Kahl ◽  
Tom Nilges
Keyword(s):  
Mass Spectrometry ◽  
Ir Spectroscopy ◽  
Single Crystal ◽  
Thermal Analyses ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

AbstractThree new complexes of Cu(II) halides (Cl, Br) with 1-methylimidazole (MIm), [Cu(MIm)4]Br2 (1), [Cu(MIm)4Br]Br · H2O (2), and [Cu(MIm)6]Cl2 · 2H2O (3) have been synthesized in ethanol. Their crystal structures have been determined by single-crystal X-ray diffraction. FT-IR spectroscopy, mass spectrometry, and thermal analyses were applied to characterize the compounds.

scholarly journals Modeling of magneto-conductivity of bismuth selenide: a topological insulator

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Yogesh Kumar ◽  
Rabia Sultana ◽  
Prince Sharma ◽  
V. P. S. Awana
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Single Crystal ◽  
Single Crystals ◽  
X Ray Diffraction ◽  
Field Range ◽  
X Ray ◽  
Bulk Carriers ◽  
Different Temperatures

AbstractWe report the magneto-conductivity analysis of Bi2Se3 single crystal at different temperatures in a magnetic field range of ± 14 T. The single crystals are grown by the self-flux method and characterized through X-ray diffraction, Scanning Electron Microscopy, and Raman Spectroscopy. The single crystals show magnetoresistance (MR%) of around 380% at a magnetic field of 14 T and a temperature of 5 K. The Hikami–Larkin–Nagaoka (HLN) equation has been used to fit the magneto-conductivity (MC) data. However, the HLN fitted curve deviates at higher magnetic fields above 1 T, suggesting that the role of surface-driven conductivity suppresses with an increasing magnetic field. This article proposes a speculative model comprising of surface-driven HLN and added quantum diffusive and bulk carriers-driven classical terms. The model successfully explains the MC of the Bi2Se3 single crystal at various temperatures (5–200 K) and applied magnetic fields (up to 14 T).

One Step Synthesis and Characterization of Zirconia-Graphene Composites

2012 ◽  
Vol 600 ◽  
pp. 174-177 ◽  
Author(s):  
Jian Fei Xia ◽  
Zong Hua Wang ◽  
Yan Zhi Xia ◽  
Fei Fei Zhang ◽  
Fu Qiang Zhu ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Graphene Composite ◽  
Transmission Electron ◽  
One Step ◽  
Ft Ir ◽  
Xrd Techniques

Zirconia-graphene composite (ZrO2-G) has been successfully synthesized via decomposition of ZrOCl2•6H2O in a water-isopropanol system with dispersed graphene oxide (GO) utilizing Na2S as a precursor could enable the occurrence of the deposition of Zr4+ and the deoxygenation of GO at the same time. Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) techniques were used to characterize the samples. It was found that graphene were fully coated with ZrO2, and the ZrO2 existing in tetragonal phase, which resulted in the formation of two-dimensional composite.

scholarly journals After 200 Years: The Structure of Bleach and Characterization of Hypohalite Ions by Single‐Crystal X‐Ray Diffraction

2021 ◽  
Author(s):  
Filip Topić ◽  
Joseph M. Marrett ◽  
Tristan H. Borchers ◽  
Hatem M. Titi ◽  
Christopher J. Barrett ◽  
...  
Keyword(s):  
Single Crystal ◽  
X Ray Diffraction ◽  
X Ray

Microwave-assisted solvent-free synthesis and spectral and structural characterization of cyclotriphosphazene hexakis(o-tolylamide)

2018 ◽  
Vol 73 (12) ◽  
pp. 999-1003 ◽  
Author(s):  
Mohammad Hakimi ◽  
Homeyra Rezaei ◽  
Keyvan Moeini ◽  
Heidar Raissi ◽  
Vaclav Eigner ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Microwave Irradiation ◽  
Stacking Interactions ◽  
X Ray Diffraction ◽  
Aromatic Rings ◽  
X Ray ◽  
Microwave Assisted ◽  
Ft Ir ◽  
Solvent Free Synthesis

AbstractA new cyclotriphosphazene, 2,2,4,4,6,6-hexakis (o-tolylamono)-1,3,5,2λ5,4λ5,6λ5-triazatriphosphinine (MPAP), was prepared using microwave irradiation and identified by elemental analysis, FT-IR, Raman, 31P NMR spectroscopy, and single-crystal X-ray diffraction. In the crystal, in addition to hydrogen bonds, the network is further stabilized by inter- and intramolecular π–π stacking interactions between aromatic rings.

Synthesis and Characterization of Tetraphenylphosphonium Tetraazidoborate

2002 ◽  
Vol 57 (6) ◽  
pp. 621-624 ◽  
Author(s):  
Wolfgang Fraenk ◽  
Heinrich Nöth ◽  
Thomas M. Klapötke ◽  
Max Suter
Keyword(s):  
Single Crystal ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray

AbstractTetraphenylphosphonium tetraazidoborate, [P(C6H5)4][B(N3)4], was obtained from B(N3)3 - in situ prepared from BH3 · O(C2H5)2 and HN3 - and [P(C6H5)4][N3]. Recrystallization from an acetonitrile / hexane mixture yielded colorless crystals in 60% yield. The molecular structurewas determined by single crystal X-ray diffraction and the [B(N3)4]- anionwas shown to possess S4 symmetry.

scholarly journals Structural and morphological characterization of rare earth modified lead titanate

Cerâmica ◽  
2007 ◽  
Vol 53 (328) ◽  
pp. 422-447
Author(s):  
F. C. D. Lemos ◽  
D. M. A. Melo ◽  
P. S. de Lima ◽  
C. A. Paskocimas ◽  
E. Longo ◽  
...  
Keyword(s):  
Rare Earth ◽  
Lead Titanate ◽  
Pechini Method ◽  
Morphological Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Crystallite Sizes ◽  
Modifier Cation

Rare earth modified lead titanate powders Pb1-xRExTiO3 (REPT), x = 0.01, 0.05, 0.07 and RE = Yb, Y, were prepared by the Pechini method. The materials were calcined under flowing oxygen at different temperatures from 300 to 700 ºC. Nanostructured REPT were investigated using X-ray diffraction, scanning electron microscopy and surface area analysis (BET). The results suggest that the modifier cation incorporated into the system has notable influence in the microstructure and a notable decrease in the crystallite sizes.

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