X-ray powder diffraction data for a new compound (NH4)H2Co2O(OH)(MoO4)1.6(WO4)0.4•H2O type ϕy

2018 ◽  
Vol 33 (4) ◽  
pp. 315-318 ◽  
Author(s):  
Adriana Echavarría ◽  
Sandra L. Amaya
Keyword(s):  
Raman Spectroscopy ◽  
Lamellar Structure ◽  
Laser Raman Spectroscopy ◽  
Powder Diffraction Data ◽  
X Ray Diffraction ◽  
Hexagonal Symmetry ◽  
X Ray ◽  
Laser Raman ◽  
Ir Laser ◽  
Ft Ir

A new trimetallic compound with formula (NH4)H2Co2O(OH)(MoO4)1.6(WO4)0.4•H2O and lamellar structure was prepared by hydrothermal synthesis. The solid was characterized using X-ray diffraction (XRD), thermogravimetric (TGA) and differential thermal (DTA) analyses, Fourier-transform infrared spectroscopy (FT–IR), laser Raman spectroscopy (LRS), and atomic absorption spectroscopy (AA). Crystallographic studies showed that the solid crystallizes with hexagonal symmetry in space group R-3 m with a = 6.0807 and c = 21.7591 Å.

scholarly journals Effect of Graphene Oxide Concentration in Electrolyte on Corrosion Behavior of Electrodeposited Zn–Electrochemical Reduction Graphene Composite Coatings

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 758 ◽  
Author(s):  
Yang ◽  
Zhang ◽  
Wang ◽  
Wang ◽  
Chen ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Laser Raman Spectroscopy ◽  
304 Stainless Steel ◽  
Sulfate Electrolyte ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tafel Polarization ◽  
Laser Raman

Pure Zn and Zn–ERGO composite coatings were prepared by direct current electrodeposition on 304 stainless steel. Samples were characterized by X-ray diffraction (XRD), scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM/EDS), and laser Raman spectroscopy (Raman). Results obtained have shown that the concentration of GO sheets in zinc sulfate electrolyte has an important effect on the preferred crystal orientation and the surface morphology of Zn–ERGO composite coatings. A study of the corrosion behavior of the coatings by Tafel polarization and electrochemical impedance spectroscopic (EIS) methods leads to the conclusion that the Zn-1.0 g/L ERGO composite coating possesses the best corrosion resistance compared to the pure Zn coating and other composite coatings in this study.

scholarly journals Characterization of Metal/Carbon Multilayers by Raman Spectroscopy

1989 ◽  
Vol 160 ◽  
Author(s):  
David D. Allred ◽  
Qi Wang ◽  
Jesus Gonzalez-Hernandez
Keyword(s):  
Raman Spectroscopy ◽  
Amorphous Semiconductor ◽  
Laser Raman Spectroscopy ◽  
Plasma Confinement ◽  
Ray Optics ◽  
X Ray ◽  
Laser Raman ◽  
Line Shapes ◽  
Two Peaks

AbstractLaser Raman spectroscopy has been found to be useful for characterizing amorphous semiconductor multilayers, especially the interfaces of multilayers. Recently, we have extended this technique to the characterization of magnetron sputtered multilayers commonly used as reflectors in soft x-ray optics. Unlike the multilayers previously studied which contained only semiconductors and dielectrics, these are generally semiconductor/metal multilayers. We report here on the Raman characterization of the most common class of multilayers used in soft x-ray optics, those that contain a high density metal like tungsten interspersed with layers of carbon. In all of the metal/carbon multilayers the dominate feature in the Raman spectra is due to a-C. The a-C spectra consists of a broad peak at about 1560 cm-1 (G-peak) and a shoulder at about 1400 cm-1 (D-peak). This can be deconvoluted with Gaussian line shapes to yield two peaks (one at about 1560 to 1570 cm-1 and the other at about 1380 to 1420 cm-1). Among the W/C multilayer samples peak positions and relative magnitudes changed little with carbon thickness over the range of 1 to 12 nm. Significant differences are, however, seen as the identity of the metal component is altered or, especially, as the preparations are varied. For example, the intensity ratio of the D-peak to G-peak was much larger for multilayer samples prepared under conditions of good plasma confinement.

scholarly journals Gamma-Irradiation Induced Functionalization of Graphene Oxide with Organosilanes

2019 ◽  
Vol 20 (8) ◽  
pp. 1910 ◽  
Author(s):  
Kabiru Musa Aujara ◽  
Buong Woei Chieng ◽  
Nor Azowa Ibrahim ◽  
Norhazlin Zainuddin ◽  
Chantara Thevy Ratnam
Keyword(s):  
Raman Spectroscopy ◽  
Graphene Oxide ◽  
Thermogravimetric Analysis ◽  
Gamma Ray ◽  
Chemical Interaction ◽  
Chemical Reduction ◽  
Contact Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir

Gamma-ray radiation was used as a clean and easy method for turning the physicochemical properties of graphene oxide (GO) in this study. Silane functionalized-GO were synthesized by chemically grafting 3-aminopropyltriethoxysilane (APTES) and 3-glycidyloxypropyltrimethoxysilane (GPTES) onto GO surface using gamma-ray irradiation. This established non-contact process is used to create a reductive medium which is deemed simpler, purer and less harmful compared conventional chemical reduction. The resulting functionalized-GO were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis (TGA), and Raman spectroscopy. The chemical interaction of silane with the GO surface was confirmed by FT-IR. X-ray diffraction reveals the change in the crystalline phases was due to surface functionalization. Surface defects of the GO due to the introduction of silane mioties was revealed by Raman spectroscopy. Thermogravimetric analysis of the functionalized-GO exhibits a multiple peaks in the temperature range of 200–650 °C which corresponds to the degradation of chemically grafted silane on the GO surface.

MECHANOCHEMICAL SYNTHESIS OF NANOCRYSTALLINE FLUORINATED HYDROXYAPATITE

2005 ◽  
Vol 04 (04) ◽  
pp. 643-649 ◽  
Author(s):  
N. RAMESHBABU ◽  
T. S. SAMPATH KUMAR ◽  
R. MURUGAN ◽  
K. PRASAD RAO
Keyword(s):  
Laser Raman Spectroscopy ◽  
Mechanochemical Processing ◽  
Fluorine Substitution ◽  
X Ray ◽  
Laser Raman ◽  
Fine Grain ◽  
Transmission Electron ◽  
Ft Ir ◽  
Synthetic Hydroxyapatite ◽  
Nano Size

Synthetic hydroxyapatite ( Ca 10( PO 4)6( OH )2, HA ) is an important material used for orthopaedic and dental implant applications. The biological hydroxyapatite in the human bone and tooth is of nano size and differs in composition from the stiochiometric HA by the presence of other ions such as carbonate, magnesium and fluoride, etc. Osseointegration is enhanced by using nanocrystalline HA . This stimulates the interest in synthesizing nanocrystalline HA by different routes and among the methods, mechanochemical seems to form fine grain size and uniform characteristic nanocrystalline materials. Fluorinated hydroxyapatite ( FHA , Ca 10( PO 4)6( OH )2-x F x) possesses higher corrosion resistance in biofluids than pure HA and reduces the risk of dental caries. The present work deals with the synthesis of nanocrystalline FHAs by mechanochemical processing. The nanomaterials were characterized using X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) methods. Nano FHA of about 27-46 nm size was observed. The functional groups present in the FHA powders were ascertained by Fourier transform infrared spectroscopy (FT-IR) and Laser Raman spectroscopy. A gradual decrease in intensity of the OH - band at 655 and 3572 cm-1 has been observed with increasing fluorine substitution. The TEM micrograph shows that the powder is highly agglomerated and particle size is below 50 nm.

Photo- and Thermo-Chromic Study of the Ethylenediamine Trimolybdate

2008 ◽  
Vol 47-50 ◽  
pp. 1193-1196
Author(s):  
De Hui Sun ◽  
Hong Jie Zhang ◽  
Ji Lin Zhang ◽  
Jiang Bo Yu
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Powder Diffraction ◽  
Color Difference ◽  
Laser Raman Spectroscopy ◽  
X Ray ◽  
Laser Raman ◽  
Thermochromic Properties ◽  
The Difference

The ethylenediamine trimolybdate (ENTMo) can show unusually photochromic and thermochromic properties and there exists in the difference of chromic mechanisms, which has been proved in our previous work [1]. In this paper, X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) and laser Raman spectroscopy (LRS) of the colored samples are characterized and analyzed in detail. The crystal structure, the inorganic skeleton and the microenvironment of center ions of the colored samples do not substantively change except distortion. The color difference of the photochromic and the thermochromic samples is discussed and that the difference of reduction sites result in their different chromic mechanisms is suggested.

Synthesis and characterization of a macrocyclic copper complex containing the 14-membered 1,3,5,8,10,12-hexaazacyclotetradecane unit

2017 ◽  
Vol 72 (2) ◽  
pp. 115-118 ◽  
Author(s):  
Mohammad Hakimi ◽  
Zahra Mardani ◽  
Keyvan Moeini ◽  
Fabian Mohr
Keyword(s):  
Raman Spectroscopy ◽  
Elemental Analysis ◽  
Copper Complex ◽  
Copper Atom ◽  
Octahedral Geometry ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir

AbstractIn this work, a new macrocyclic copper complex, [Cu(ACE)(SCN)2]; ACE: 1,3,6,10,12,15-hexaazatricyclo[13.3.1.16,10]eicosane, was prepared and characterized by elemental analysis, FT-IR, Raman spectroscopy and single-crystal X-ray diffraction. X-ray analysis of [Cu(ACE)(SCN)2] reveals an elongated octahedral geometry around the copper atom in a centrosymmetric CuN6 environment.

scholarly journals Fabrication, Characterization, and Antimicrobial Activity, Evaluation of Low Silver Concentrations in Silver-Doped Hydroxyapatite Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
A. Costescu ◽  
C. S. Ciobanu ◽  
S. L. Iconaru ◽  
R. V. Ghita ◽  
C. M. Chifiriuc ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Raman Spectroscopy ◽  
Hydroxyl Groups ◽  
Major Public Health Problem ◽  
Hydroxyapatite Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Raman Spectroscopy ◽  
Ft Ir ◽  
Ft Raman

The aim of this study was the evaluation of(Ca10-xAgx)(PO4)6(OH)2nanoparticles (Ag:HAp-NPs) for their antibacterial and antifungal activity. Resistance to antimicrobial agents by pathogenic bacteria has emerged in the recent years as a major public health problem worldwide. In this paper, we report a comparison of the antimicrobial activity of low concentrations silver-doped hydroxyapatite nanoparticles. The silver-doped nanocrystalline hydroxyapatite powder was synthesized at 100°C in deionised water. The as-prepared Ag:Hap nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), FT-IR, and FT-Raman spectroscopy. X-ray diffraction (XRD) studies demonstrate that powders obtained by coprecipitation at 100°C exhibit the apatite characteristics with good crystal structure, without any new phase or impurities found. FT-IR and FT-Raman spectroscopy revealed the presence of the various vibrational modes corresponding to phosphates and hydroxyl groups and the absence of any band characteristic to silver. The specific microbiological assays demonstrated that Ag:HAp-NPs exhibited antimicrobial features, but interacted differently with the Gram-positive, Gram-negative bacterial and fungal tested strains.

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