scholarly journals Biogenic Orthorhombic α-Calcium Formate from Sediments of Alkali Lake, Oregon, USA

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 448
Author(s):  
Nikita V. Chukanov ◽  
Cesar Menor-Salvan ◽  
Vladislav V. Gurzhiy ◽  
Alina R. Izatulina ◽  
Igor V. Pekov ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Diffraction Analysis ◽  
Anthropogenic Pollution ◽  
Agent Orange ◽  
Low Density ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infrared And Raman Spectroscopy ◽  
Two Factors ◽  
Calcium Formate

Centimeter-sized crystals of orthorhombic calcium formate, α-Ca(HCO2)2 from Alkali Lake, Oregon, USA have been studied by means of powder and single-crystal X-ray diffraction analysis, infrared, and Raman spectroscopy. Based on the data on carbon isotope abundance in calcium formate and associated minerals, it was concluded that the formation of α-Ca(HCO2)2 may be a result of a combination of two factors: lake microbial metabolism and anthropogenic pollution with Agent Orange. Possible causes of stability of the low-density tetragonal β-Ca(HCO2)2 polymorph (formicaite) in boron ores are discussed.

A novel electrochemical synthesis of graphene oxide: Converting waste product to utility

2021 ◽  
Author(s):  
A Neog ◽  
Rajib Biswas ◽  
N. Bharali
Keyword(s):  
Raman Spectroscopy ◽  
Graphene Oxide ◽  
Diffraction Analysis ◽  
Electrochemical Synthesis ◽  
Waste Product ◽  
Basic Medium ◽  
X Ray Diffraction ◽  
X Ray ◽  
Green Route ◽  
Confirmatory Tests

Abstract We comprehensively report here a green route for synthesizing graphene oxide from waste batteries. The satisfactory yield, formulated wholly through basic medium, is validated through confirmatory tests via X-ray Diffraction analysis, FTIR, UV-Vis and Raman Spectroscopy. The overall scheme turns out to be engaging less reactants as well as facile; thus converting a waste material to a useful product.

scholarly journals Structural analysis of inclusions detected by x-ray inspection of preforms and parts from fine-grained graphite MPG-7

2019 ◽  
pp. 54-59
Author(s):  
A. V. Vershinin ◽  
E. G. Belyakova ◽  
M. V. Vershinina ◽  
E. V. Polyakov ◽  
V. G. Bamburov ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Structural Analysis ◽  
Diffraction Analysis ◽  
Structural Defects ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fine Grained

By X-ray diffraction analysis and Raman spectroscopy, we studied samples of fine-grained graphite MPG-7 with detected chemical and structural defects. We determined the effect of structural and chemical defects on the micro- and macrostructure of graphite and estimated its crystallinity depending on the type of defects detected.

Étude comparative dans la série des dibenzamido-alcanes, composés modèles des poly(oligométhylènes téréphtalamides)

1985 ◽  
Vol 63 (12) ◽  
pp. 3390-3397 ◽  
Author(s):  
Josée Brisson ◽  
François Brisse
Keyword(s):  
Raman Spectroscopy ◽  
Aromatic Ring ◽  
Torsion Angle ◽  
Amide Group ◽  
Aliphatic Chain ◽  
X Ray Diffraction ◽  
X Ray ◽  
V Band ◽  
Infrared And Raman Spectroscopy ◽  
Ir And Raman

The dibenzamido alcanes, nDBN, for n = 2–10, have been synthesized and characterized by X-ray diffraction and infrared and Raman spectroscopy. From X-ray diffraction it was observed than the dihedral angle ε between the aromatic ring and the amido group averaged 28.3° and did not vary significantly with n. The torsion angle τ between the amide group and the aliphatic chain was found to be near 180° for n = 4, 6, 8, and 10. However, for n = 2, 3, 5, and 7, τ averaged 98°. In this last case the plane of the aliphatic chain is nearly perpendicular to the plane of the amide group. The study of ir and Raman spectra in relation to conformation revealed that the position of the amide V band depends on the value of the τ angle and could be used to infer if the latter is close to 180° or not.

scholarly journals Residual stresses in additively manufactured AlSi10Mg: Raman spectroscopy and X-ray diffraction analysis

2021 ◽  
Vol 202 ◽  
pp. 109550
Author(s):  
Silvia Marola ◽  
Silvia Bosia ◽  
Alessandro Veltro ◽  
Gianluca Fiore ◽  
Diego Manfredi ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Residual Stresses ◽  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
X Ray

Synthesis, structure, and vibrational spectrum of poly-μ-pyrazine(pyrazine)(trifluoromethanesulfonato-O)copper(I)

1989 ◽  
Vol 67 (11) ◽  
pp. 1964-1969 ◽  
Author(s):  
T. Otieno ◽  
S. J. Rettig ◽  
R. C. Thompson ◽  
J. Trotter
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Copper Ions ◽  
Heavy Atom ◽  
X Ray Diffraction ◽  
Full Matrix ◽  
X Ray ◽  
Methanol Solutions ◽  
Infrared And Raman Spectroscopy ◽  
Spectroscopy Studies

Orange–brown crystals of composition Cu(pyz)2(CF3SO3) (pyz = pyrazine, 1,4-diazine) were obtained from methanol solutions containing Cu(CF3SO3)2 and pyrazine in approximate 1:2 mole ratio. Single crystal X-ray diffraction and infrared and Raman spectroscopy studies are reported. Crystals of the title compound are triclinic, a = 8.312(2), b = 10.903(3), c = 8.201(2) Å, α = 92.53(2), β = 113.77(2), γ = 91.40(2)°, Z = 2, space group [Formula: see text] The structure was solved by heavy atom methods and was refined by full-matrix least-squares to R = 0.035 and Rw = 0.044 for 2458 reflections with 1 ≥ 3σ(I). The compound contains chains of copper ions linked by bidentate bridging pyrazine ligands. The coordination around each copper is completed by monodentate pyrazine and trifluoromethanesulfonato groups to produce a distorted tetrahedral CuN3O chromophore. Keywords: crystal structure, μ-pyrazine copper(I) triflate polymer, vibrational spectra.

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