scholarly journals Extra-Framework Content in Sodalite-Group Minerals: Complexity and New Aspects of Its Study Using Infrared and Raman Spectroscopy

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 363 ◽  
Author(s):  
Nikita V. Chukanov ◽  
Marina F. Vigasina ◽  
Natalia V. Zubkova ◽  
Igor V. Pekov ◽  
Christof Schäfer ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Raman Spectroscopy ◽  
Structural Analysis ◽  
Ir Spectroscopy ◽  
Quantitative Method ◽  
Fluoride Anion ◽  
Spectroscopy Data ◽  
Group Mineral ◽  
X Ray ◽  
Infrared And Raman Spectroscopy

Nine samples of carbonate-free sodalite-group minerals, including those with abnormally high contents of polysulfide groups, fluoride anion and carbon dioxide molecules as well as synthetic fluoraluminate sodalite-type compound Na8(Si7Al5O24)(AlF6)3–·5H2O, have been studied by means of electron microprobe analyses, infrared and Raman spectroscopy; the CO2 content was determined using the selective sorption of gaseous ignition products. This article describes a semi-quantitative method for estimating the content of carbon dioxide molecules in these minerals, based on IR spectroscopy data. The data obtained demonstrate the existence of a sulfide sodalite-group mineral with the idealized formula Na7(Si6Al6O24)(S3−)·H2O, which differs significantly from the formula Na6Ca2(Si6Al6O24)S2–2 accepted for lazurite. According to single-crystal X-ray structural analysis, in the F-rich sodalite-group mineral from the Eifel paleovolcanic region, Germany with the idealized formula Na7(Si6Al6O24)F−·nH2O fluorine occurs as an isolated F− anion, unlike synthetic F-rich sodalite-type compounds.

scholarly journals Segmental and site specific isotope labelling strategies for structural analysis of posttranslationally modified proteins

2021 ◽  
Author(s):  
Dominik P Vogl ◽  
Anne C. Conibear ◽  
Christian F.W. Becker
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Raman Spectroscopy ◽  
Structural Analysis ◽  
Posttranslational Modifications ◽  
Protein Structures ◽  
Spectroscopic Techniques ◽  
Site Specific ◽  
Isotope Labelling ◽  
Infrared And Raman Spectroscopy ◽  
Modified Proteins

Posttranslational modifications can alter protein structures, functions and localisation, and are important cellular regulatory and signalling mechanisms. Spectroscopic techniques such as nuclear magnetic resonance, infrared, and Raman spectroscopy, as well...

scholarly journals О структуре тонких пленок монооксида германия

2020 ◽  
Vol 54 (12) ◽  
pp. 1296
Author(s):  
К.Н. Астанкова ◽  
В.А. Володин ◽  
И.А. Азаров
Keyword(s):  
Raman Spectroscopy ◽  
Ir Spectroscopy ◽  
Mixture Model ◽  
Atomic Structure ◽  
Photoelectron Spectroscopy ◽  
Mechanical Stresses ◽  
Electron Microscopic ◽  
X Ray ◽  
Random Mixture ◽  
Germanium Monoxide

By means of optical (Raman spectroscopy, IR spectroscopy, X-ray photoelectron spectroscopy) and electron microscopic methods, it was found that the atomic structure of stoichiometric germanium monoxide films corresponds to the random bonding model, without the formation of germanium nanoclusters. This structure is metastable and transforms into a structure which is close to random mixture model at a temperature 260 oC and higher. The metastability of solid GeO may be related to the presence of internal mechanical stresses in the atomic network.

X-ray photoelectron, infrared, and Raman spectroscopy studies of novel submicrometric poly[(methacrylato)aluminum(III)]

2006 ◽  
Vol 102 (6) ◽  
pp. 5212-5223 ◽  
Author(s):  
Alfredo R. Vilchis-Nestor ◽  
Victor Sánchez-Mendieta ◽  
Fernando Ureña-Nuñez ◽  
Rafael López-Castañares ◽  
Jorge A. Ascencio
Keyword(s):  
Raman Spectroscopy ◽  
X Ray ◽  
Infrared And Raman Spectroscopy ◽  
Spectroscopy Studies

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.

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