Effects of the ordering of structural units of the cationic sublattice of LiNbO3:Zn crystals and their manifestation in Raman spectra

2014 ◽  
Vol 116 (2) ◽  
pp. 281-290 ◽  
Author(s):  
N. V. Sidorov ◽  
A. A. Yanichev ◽  
M. N. Palatnikov ◽  
A. A. Gabain
Keyword(s):  
Raman Spectra ◽  
Cationic Sublattice ◽  
Structural Units

IR AND RAMAN SPECTROSCOPIC INVESTIGATIONS OF Cr2O3-TeO2-B2O3-SrO GLASSES

2004 ◽  
Vol 18 (09) ◽  
pp. 367-373 ◽  
Author(s):  
I. ARDELEAN ◽  
N. MUREŞAN ◽  
P. PĂŞCUŢĂ
Keyword(s):  
Raman Spectra ◽  
Glass Network ◽  
Ir And Raman Spectra ◽  
Structural Units ◽  
Raman Spectroscopic ◽  
Chromium Ions ◽  
Spectroscopic Investigations ◽  
Ir And Raman

The Cr 2 O 3 content influence on the structure of 70 TeO 2·25 B 2 O 3·5 SrO glasses, was investigated by infrared and Raman spectroscopies. The results show that BO 3 and BO 4 are among the main structural units in the investigated glasses, together with TeO 3 and TeO 4 units. The presence of chromium ions located in the glass network is well evidenced in the IR and Raman spectra.

scholarly journals Raman Spectroscopy and Statistical Analysis of the Silicate Species and Group Connectivity in Cesium Silicate Glass Forming System

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Armenak Osipov ◽  
Leyla Osipova ◽  
Rimma Zainullina
Keyword(s):  
Experimental Data ◽  
Raman Spectroscopy ◽  
Statistical Analysis ◽  
Raman Spectra ◽  
Dynamic Equilibrium ◽  
Structural Units ◽  
Melt Temperature ◽  
Deconvolution Analysis ◽  
Glass Forming ◽  
Increasing Temperature

The Raman spectra of x%Cs2O-(100 − x)%SiO2 (x=17, 22, 27, 33, and 37 mol%) glasses and melts were measured in the temperature range of 293 to 1553 K. The concentrations of the Qn species were calculated as a function of the composition and temperature based on the deconvolution analysis of the spectra. It was found that a dynamic equilibrium among structural units in the melts with x>17 mol% can be described by disproportionation reaction Q3⇔Q4+Q2. The enthalpy of this reaction was found to be equal to 32 ± 6, 43 ± 8, 56 ± 10, and 52 ± 9 for x=22, 27, 33, and 37 mol%, respectively. The nonideal entropy of mixing (ΔSmix) depends on the melt temperature and increases almost linearly with increasing temperature. The Qn, Q2–Q2, and Qn,ijkl distributions with x ranging from 0 to 55 mol% were modeled using experimental data for the concentrations of the Qn units.

Raman spectra of quasi-binary glasses As2S3−GeS2 doped with Er

2013 ◽  
Vol 37 (1) ◽  
pp. 33-38
Author(s):  
V. B. Petrović ◽  
I. O. Gúth ◽  
S. R. Lukić-Petrović
Keyword(s):  
Raman Spectroscopy ◽  
Rare Earth ◽  
Raman Spectra ◽  
Chalcogenide Glasses ◽  
Glass Matrix ◽  
Earth Element ◽  
Structural Units ◽  
Low Intensity ◽  
Quasibinary System ◽  
Different Origin

Abstract This work is concerned with a study of chalcogenide glasses doped with the rare-earth element erbium. The study was carried out on samples of the quasibinary system As2S3−GeS2 doped with erbium at the concentrations of 0, 0.01, 0.1, 0.5 and 1 at %. Raman spectroscopy was used to identify the presence of particular structural units in the glass matrix. The spectra of all the samples are characterized by an intense peak appearing as a consequence of the stretching of the As-S and Ge-S bonds. Further, several low-intensity peaks of different origin were also registered. These peaks arise due to the stretching of the bonds in the ring S8 and the bonds resulting from the existence of the ethane-type molecules (GeSn) in some of the samples. The peaks in the spectrum of the sample with the highest erbium content are characterized by the peaks that can be attributed to the stretching of the bond Er-S.

Ordering of structural units of the cationic sublattice in zinc-doped lithium niobate crystals

2013 ◽  
Vol 452 (2) ◽  
pp. 243-246 ◽  
Author(s):  
N. V. Sidorov ◽  
M. N. Palatnikov ◽  
A. A. Yanichev ◽  
A. A. Gabain ◽  
A. A. Kruk ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Cationic Sublattice ◽  
Structural Units ◽  
Lithium Niobate Crystals

RAMAN STUDY OF xMeO · (100-x)[P2O5 · CaO](MeO=Fe2O3, V2O5 OR (Fe2O3 · V2O5)) GLASS SYSTEMS

2010 ◽  
Vol 24 (18) ◽  
pp. 2007-2014
Author(s):  
CONSTANTIN ANDRONACHE
Keyword(s):  
Raman Spectra ◽  
Glass Matrix ◽  
Vanadium Content ◽  
Absorption Bands ◽  
Structural Units ◽  
Raman Scattering Spectroscopy ◽  
Oxygen Ions ◽  
The Matrix ◽  
Raman Study ◽  
Vanadium Ions

Glasses from x MeO · (100-x)[ P 2 O 5 · CaO ], ( MeO = Fe 2 O 3, V 2 O 5 or ( Fe 2 O 3 · V 2 O 5)) were prepared and investigated using Raman scattering spectroscopy, over compositional range x=0–50% mol. The influence of Fe 2 O 3, V 2 O 5 or ( Fe 2 O 3· V 2 O 5) content on the structure of P 2 O 5· CaO glass matrix was followed. The addition of Fe 2 O 3, V 2 O 5 or ( Fe 2 O 3· V 2 O 5) determines the modification of the structure of the studied glasses. The Raman spectra of x Fe 2 O 3(100-x)[ P 2 O 5· CaO ] do not present any absorption bands characteristic to Fe 2 O 3 but its evolution is dependent on the iron content. The Raman spectra of x V 2 O 5·(100-x)[ P 2 O 5· CaO ] present, besides the bands specific for the matrix, some bands assigned to characteristic vibrations of V – O bonds which are evidenced only for high content of V 2 O 5. The evolution of the spectra is dependent on V 2 O 5 content. The Raman spectra of x( Fe 2 O 3· V 2 O 5)·(100-x)[ P 2 O 5· CaO ] system showed that phosphate units are the main structural units of the glass system, iron and vanadium ions are located in the network. The increasing of iron and vanadium content indicate a gradual decrease in the number of bridging oxygen ions and an increase in the number of non-bridging oxygen ions.

Raman Spectra of Cinnabar (HgS), Realgar (As4S4) and Orpiment (As2S3)

1969 ◽  
Vol 24 (3) ◽  
pp. 408-411 ◽  
Author(s):  
W. Scheuermann ◽  
G. J. Ritter
Keyword(s):  
Raman Spectra ◽  
Room Temperature ◽  
Laser Excitation ◽  
Structural Units ◽  
Raman Spectrometer ◽  
Partial Assignment ◽  
Naturally Occurring ◽  
Covalently Bonded ◽  
Infra Red

Abstract The Raman shifts in naturally occurring cinnabar (HgS), realgar (As4S4) and orpiment (As2S3) have been measured at room temperature using a photoelectrically recording Raman spectrometer with He-Ne laser excitation at 6328 Å. By using the infra-red spectra of these compounds it was possible to make a partial assignment of these shifts. The number and symmetries of the Raman active phonons were calculated for the covalently bonded "sub-units". Most of the theoretically predicted vibrations were observed. The theory that realgar and orpiment are built from the same structural units could be supported.

scholarly journals Boson Peak and Superstructural Groups in Na2O-B2O3 Glasses

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Armenak A. Osipov ◽  
Leyla M. Osipova
Keyword(s):  
Raman Spectra ◽  
Linear Correlation ◽  
Geometric Analysis ◽  
Low Frequency ◽  
Point Of View ◽  
Sodium Borate ◽  
Borate Glasses ◽  
Structural Units ◽  
Intermediate Range Order ◽  
Average Size

Low-frequency Raman spectra of the sodium borate glasses with Na2O content ranging from 0 to 30 mol% were measured and analyzed from the point of view of their structure in the intermediate range order. Our results show that there is a simple linear correlation between correlation length, lc, and an average size, <R>, of the area of ordered arrangement of atoms, obtained via the distribution of the (super)structural units and their representative size. Six types of the areas of ordered arrangement of atoms were determined, being related to the presence of the B3O3⌀3 boroxol rings, B3O3⌀4- triborate rings, B5O6⌀4- pentaborate groups, B8O10⌀62- tetraborate groups, B4O5⌀42- diborate groups, and B3O63- cyclic metaborate anions in the sodium borate glasses. It was shown that the size of the areas of ordered arrangement of atoms can be determined from the simple geometric analysis of the crystallographic data on the superstructural units.

Single Crystal Raman Spectra of the Phase Transition in KTCNQ

1982 ◽  
Vol 85 (1) ◽  
pp. 297-303 ◽  
Author(s):  
A. D. Bandrauk ◽  
K. D. Truong ◽  
S. Jandl
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Raman Spectra
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