scholarly journals Raman spectroscopic study of bioactive silica-based glasses: The role of the alkali/alkali earth ratio on the Non-Bridging Oxygen/Bridging Oxygen (NBO/BO) ratio

2009 ◽  
Vol 23 (3-4) ◽  
pp. 227-232 ◽  
Author(s):  
Lucia Marsich ◽  
Loredana Moimas ◽  
Valter Sergo ◽  
Chiara Schmid
Keyword(s):  
Raman Spectra ◽  
Glass Composition ◽  
Linear Increase ◽  
Calibration Plot ◽  
Bioactive Glasses ◽  
Raman Spectroscopic ◽  
Alkali Earth ◽  
Raman Spectroscopic Study ◽  
Dissolution Tests

Raman spectra of bioactive glasses of the Na2O–K2O–MgO–CaO–B2O3–P2O5–SiO2to be used in bone reconstruction systems have been collected from samples with three different concentrations of alkali and alkali earth elements. Compositions were chosen with a constant total amount of modifiers and formers, with only minor changes among the formers. The ratio of Non-Bridging Oxygens to Bridging Oxygens (NBO/BO) has been obtained from the Raman spectra and reported as a function of the alkali/alkali earth ratio, showing a linear increase. Dissolution tests indicate also a linear dependence of the amount of Na+, K+and Ca++ions leached in water on the alkali/alkali earth ratio. Consequently a calibration plot correlating the NBO/BO ratio with the amount of Na+, K+and Ca++ions leached in water has been obtained, thus demonstrating the sensitivity of the method, given that the changes from one glass composition to the other are of the order of some points in percentage among the glass modifiers.

scholarly journals Hydrogen Bonds: Raman Spectroscopic Study

2021 ◽  
Vol 22 (10) ◽  
pp. 5380
Author(s):  
Boris A. Kolesov
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Spectroscopic Study ◽  
Raman Spectra ◽  
Temperature Region ◽  
Vibrational Frequency ◽  
Chemical Compounds ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Proton Dynamics

The work outlines general ideas on how the frequency and the intensity of proton vibrations of X–H×××Y hydrogen bonding are formed as the bond evolves from weak to maximally strong bonding. For this purpose, the Raman spectra of different chemical compounds with moderate, strong, and extremely strong hydrogen bonds were obtained in the temperature region of 5 K–300 K. The dependence of the proton vibrational frequency is schematically presented as a function of the rigidity of O-H×××O bonding. The problems of proton dynamics on tautomeric O–H···O bonds are considered. A brief description of the N–H···O and C–H···Y hydrogen bonds is given.

scholarly journals A Raman spectroscopic study of the natural carbonophosphates Na<sub>3</sub><i>M</i>CO<sub>3</sub>PO<sub>4</sub> (<i>M</i> is Mn, Fe, and Mg)

2021 ◽  
Vol 33 (3) ◽  
pp. 283-297
Author(s):  
Evgeniy Nikolaevich Kozlov ◽  
Ekaterina Nikolaevna Fomina ◽  
Vladimir Nikolaevich Bocharov ◽  
Mikhail Yurievich Sidorov ◽  
Natalia Sergeevna Vlasenko ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
General Formula ◽  
Raman Spectra ◽  
Crystallographic Orientation ◽  
Energy Dispersive ◽  
X Ray ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Vibrational Bands

Abstract. Raman spectra of three natural carbonophosphates (sidorenkite, bonshtedtite, and bradleyite) with the general formula Na3MCO3PO4 (M is Mn, Fe, and Mg) were studied and compared. These spectra showed from 21 to 24 vibrational bands, of which the two most intense (964±5 and 1074±3 cm−1) correspond to the υ1(P–O) and υ1(C–O) modes. These two bands split into doublet peaks due to the occurrence of isomorphic impurities. It was found that the crystallographic orientation of the sample influences the intensity of most bands. Most bands assigned to the same vibrations showed a regular shift (the smallest in sidorenkite spectra, an intermediate in bonshtedtite, and the largest in bradleyite). We propose an algorithm that allows for diagnostics of carbonophosphates in inclusions by their Raman spectra, providing a reliable result even in the absence of energy-dispersive X-ray spectroscopy (EDX) data.

An infrared and Raman spectroscopic study of some Group 1B halide complexes containing an M4X4 core

1978 ◽  
Vol 31 (10) ◽  
pp. 2137 ◽  
Author(s):  
GA Bowmaker ◽  
RJ Knappstein ◽  
SF Tham
Keyword(s):  
Raman Spectra ◽  
Broad Band ◽  
Low Frequency ◽  
Far Infrared ◽  
Infrared And Raman Spectra ◽  
Intense Band ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Halide Complexes ◽  
Far Infrared Spectra

The infrared and Raman spectra of [Et3PcuI]4 and [Et3AsCuI]4 have been measured, and bands have been assigned to vibrations of the ligand and of the Td Cu4I4 core. The far-infrared spectra show two strong T2 v(CuI) bands at about 90 and 140 cm-1, the higher frequency member of which has a Raman counterpart which shows possible longitudinal-transverse splitting. The Raman spectra also show an intense band at about 50 cm-1. Similar features have been observed in the low-frequency vibrational spectra of [Et2S]3 [CuI]4, [C5H5NcuI]4, [C5H11NAgI]4, [Et3PAgBr]4 and [Et3PagCl]4, although the last two compounds gave only a single broad band in the v(MX) region.

Infrared and Raman Spectroscopic Study of Isocytosine

1974 ◽  
Vol 29 (7-8) ◽  
pp. 343-350 ◽  
Author(s):  
Jean-Maurice Delabar
Keyword(s):  
Infrared Spectroscopy ◽  
Spectroscopic Study ◽  
Raman Spectra ◽  
Lattice Vibration ◽  
Vibration Frequencies ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Frequency Group

Abstract Isocytosine and isocytosine-d3 crystals have been investigated at 300 K, 90 K, and 10 K by infrared spectroscopy; the Raman spectra of crystals and solutions in H2O , D2O have also been studied. Using these data and the frequency group approximation we propose assignments of the fundamental molecular frequencies. Eleven lattice vibration frequencies have been observed in absorption and nine in diffusion.

RAMAN SPECTROSCOPIC STUDY OF THE DIFFERENT CRYSTALLOGRAPHIC FACES OF YBa2Cu3O6+δ SINGLE CRYSTALS IN THE TETRAGONAL AND ORTHORHOMBIC PHASES

1991 ◽  
Vol 05 (19) ◽  
pp. 1275-1279
Author(s):  
S. M. RAO ◽  
B. H. LOO ◽  
R. E. BREWSTER ◽  
J. M. CHANG
Keyword(s):  
Spectroscopic Study ◽  
Single Crystals ◽  
Raman Spectra ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Two Phases

Raman spectra recorded on different crystallographic faces of the YBa 2 Cu 3 O 6+δ crystals in both the tetragonal and orthorhombic phases are presented which show that the spectra differ for the (001) face in the two phases.

scholarly journals A Raman spectroscopic study of uranyl minerals from Cornwall, UK

RSC Advances ◽  
2014 ◽  
Vol 4 (103) ◽  
pp. 59137-59149 ◽  
Author(s):  
R. J. P. Driscoll ◽  
D. Wolverson ◽  
J. M. Mitchels ◽  
J. M. Skelton ◽  
S. C. Parker ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
Raman Spectra ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study

Raman spectra have been collected using three excitation wavelengths for thirteen uranyl mineral samples, including novác̆ekite, and analysed.

Raman spectroscopic study on the equilibrium of carbon dioxide in aqueous monoethanolamine

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 10816-10823 ◽  
Author(s):  
M. K. Wong ◽  
A. M. Shariff ◽  
M. A. Bustam
Keyword(s):  
Carbon Dioxide ◽  
Spectroscopic Study ◽  
Raman Spectra ◽  
Chemical Species ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Major Chemical

Raman spectra of aqueous monoethanolamine of various loadings showing peak evolvement for six major chemical species.

Raman spectroscopic study of the degradation of a middle age mural painting: the role of agricultural activities

2014 ◽  
Vol 45 (11-12) ◽  
pp. 1110-1118 ◽  
Author(s):  
Marco Veneranda ◽  
Mireia Irazola ◽  
Marta Díez ◽  
Ane Iturregui ◽  
Julene Aramendia ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
Middle Age ◽  
Mural Painting ◽  
Agricultural Activities ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study

A RAMAN SPECTROSCOPIC STUDY OF RE2BaCuO5 WHERE RE = Y, Sm, Eu, Gd, Dy, Ho, Er, Tm, and Lu

1989 ◽  
Vol 03 (18) ◽  
pp. 1401-1407 ◽  
Author(s):  
B. H. LOO ◽  
D. H. BURNS ◽  
A. L. XIDIS
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Spectroscopic Study ◽  
Raman Spectra ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study

We have prepared and determined the Raman spectra of a class of compounds of formula RE2 BaCuO 5, where RE = Y , Sm, Eu, Gd, Dy, Ho, Er, Tm, and Lu. Other rare-earth elements, Nd, Ce, Tb and Pr, are found not to form this class of compounds.

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