STRUCTURAL STUDY OF x(Fe2O3·V2O5)·(100-x)[P2O5·Li2O] GLASS SYSTEM BY FTIR SPECTROSCOPY

2006 ◽  
Vol 20 (02n03) ◽  
pp. 105-110 ◽  
Author(s):  
I. ARDELEAN ◽  
C. ANDRONACHE ◽  
C. CÎMPEAN ◽  
P. PǍŞCUŢǍ
Keyword(s):  
Ir Spectra ◽  
Ftir Spectroscopy ◽  
Structural Study ◽  
Local Structure ◽  
Glass System ◽  
Nonbridging Oxygen ◽  
Structural Units ◽  
Oxygen Ions ◽  
Structure Of Glasses ◽  
Vanadium Ions

Glasses of the x( Fe 2 O 3· V 2 O 5)·(100-x)[ P 2 O 5· Li 2 O ] system, with 0≤x≤50 mol %, were prepared and investigated by FTIR spectroscopy in an attempt to determine the local structure of glasses. The interpretation of the obtained IR spectra revealed the presence and the dependence of the local structural units in the studied glasses on the iron and vanadium ions content. The results showed that phosphate units are the main structural units of the glass system and the iron and vanadium ions are located in the network. The increasing of iron and vanadium ions content indicate a gradual decreasing in the number of bridging oxygen ions and an increasing in the number of nonbridging oxygen ions.

Structural Study of the Fe2O3–B2O3–BaO Glass System by FTIR Spectroscopy

2003 ◽  
Vol 17 (22) ◽  
pp. 1175-1179 ◽  
Author(s):  
I. Ardelean ◽  
Monica Toderas ◽  
P. Paşcuţa
Keyword(s):  
Ir Spectroscopy ◽  
Ftir Spectroscopy ◽  
Structural Study ◽  
Local Structure ◽  
Glass Matrix ◽  
Glass System

Glasses belonging to the x Fe 2 O 3·(100-x)[3 B 2 O 3· BaO ] system, with 0≤x≤50 mol% were prepared and characterized by IR spectroscopy in order to obtain information about the influence of Fe 2 O 3 on the local structure in the 3 B 2 O 3· BaO glass matrix. The mode in which both Fe 2 O 3 and BaO influences the structure of glass former B 2 O 3 was analyzed.

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

2004 ◽  
Vol 18 (01) ◽  
pp. 95-101 ◽  
Author(s):  
I. ARDELEAN ◽  
N. MUREŞAN ◽  
P. PǍŞCUŢǍ
Keyword(s):  
Local Structure ◽  
Glass System ◽  
Structural Units ◽  
Raman Spectroscopic ◽  
Chromium Ions ◽  
Spectroscopic Investigations ◽  
Structure Of Glasses ◽  
Ir And Raman

Glasses of the x Cr 2 O 3·(100-x)[70 TeO 2·25 B 2 O 3·5 PbO ] system, with 0≤x≤20 mol %, were prepared and investigated by infrared and Raman spectroscopies in attempt to determine the local structure of glasses. The results shown that BO 3 and BO 4 are the main structural units of the glass system and the chromium ions are located in the network. It is evidenced the presence of TeO 3 and TeO 4 units as possible structural units in our glasses.

STRUCTURAL INVESTIGATION OF Fe2O3-B2O3-KF GLASSES BY IR AND RAMAN SPECTROSCOPIES

2004 ◽  
Vol 18 (10n11) ◽  
pp. 1651-1658 ◽  
Author(s):  
P. PĂŞCUŢĂ ◽  
D. MANIU ◽  
I. ARDELEAN
Keyword(s):  
Local Structure ◽  
Structural Investigation ◽  
Glass System ◽  
Iron Ions ◽  
Structural Units ◽  
Structure Of Glasses ◽  
Ir And Raman Spectroscopies ◽  
Ir And Raman

Glasses of the x Fe 2 O 3·(100-x)[3 B 2 O 3· KF ] system, with 0≤x≤35 mol %, were prepared and investigated by infrared (IR) and Raman spectroscopies in attempt to determine the local structure of glasses. The results shown that BO 3 and BO 4 are the main structural units of the glass system and the iron ions are located in the network as FeO 4 and FeO 6.

DSC, ESR AND IR SPECTRAL STUDIES ON Li2O–WO3–B2O3 GLASS SYSTEM DOPED WITH VANADIUM IONS

2009 ◽  
Vol 02 (03) ◽  
pp. 127-130 ◽  
Author(s):  
LINGANABOINA SRINIVASA RAO ◽  
TUMU VENKATAPPA RAO
Keyword(s):  
Glass Transition ◽  
Local Structure ◽  
Glass Matrix ◽  
Glass Forming Ability ◽  
Glass System ◽  
Spectral Studies ◽  
Glass Forming ◽  
System A ◽  
Vanadium Ions ◽  
B2o3 Glass

With in glass forming region of Li2O–WO3–B2O3 glass system, a particular composition 40Li2O–5WO3–(55 –x) B2O3 : x V2O5 (with x ranging from 0.2 to 0.8, all are in mol.%) is chosen. The DSC traces are obtained to identify the glass transition temperature ( Tg ) and the glass forming ability of all the glass samples. The ESR and IR spectra portray the local structure of the glass system and valance states of the vanadium ions in the glass matrix. As the content of V2O5 increases up to 0.6 mol.% in the glass system, a gradual conversion of vanadium ions from V5+ state to V4+ state is observed, causing the depolymerization in the glass matrix by the transformation of several glass forming units BO4 → BO3 and WO4 → WO6 .

FT-IR AND RAMAN SPECTROSCOPIC STUDY OF Cr2O3-TeO2-B2O3-SrF2 GLASSES

2006 ◽  
Vol 20 (18) ◽  
pp. 1107-1114 ◽  
Author(s):  
I. ARDELEAN ◽  
N. MUREŞAN ◽  
P. PǍŞCUŢǍ
Keyword(s):  
Spectroscopic Study ◽  
Local Structure ◽  
Glass System ◽  
Spectral Measurements ◽  
Structural Units ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Ft Ir ◽  
Raman Spectral ◽  
Ir And Raman

Homogeneous glasses were formed in the Cr 2 O 3- TeO 2- B 2 O 3- SrF 2 system, up to 20 mol% Cr 2 O 3. For these glasses, IR and Raman spectral measurements were carried out in order to elucidate the local structure. The results showed that BO 3 and BO 4 are the main structural units of the glass system and the chromium ions are located in the network. It was evidenced the presence of TeO 3 and TeO 4 units as possible structural units in our glasses.

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.

STRUCTURAL INVESTIGATIONS OF THE MnO–Bi3O3–CdO GLASS SYSTEM BY IR AND RAMAN SPECTROSCOPIES

2004 ◽  
Vol 18 (07n08) ◽  
pp. 275-279
Author(s):  
I. ARDELEAN ◽  
IOANA TODOR ◽  
P. PǍŞCUŢǍ
Keyword(s):  
Ir Spectroscopy ◽  
Local Structure ◽  
Glass Network ◽  
Glass System ◽  
Spectral Measurements ◽  
Structural Units ◽  
Structural Investigations ◽  
Ir And Raman Spectroscopies ◽  
Raman Spectral ◽  
Ir And Raman

Homogeneous glasses are formed in the MnO – Bi 3 O 3– CdO system, up to 50 mol% MnO . For these glasses, IR and Raman spectral measurements are carried out in order to elucidate the local structure. We identify by IR spectroscopy both the structural units BiO 3 and BiO 6. The Raman investigation confirms the prevalence of BiO 6 groups in the glass network for all concentrations. The number of these structural groups progressively increases with MnO content.

COMPARATIVE STRUCTURAL INVESTIGATION OF xFe2O3·(100-x)[3B2O3·MO] (MO⇒KClorCaCl2) GLASS SYSTEMS BY RAMAN SPECTROSCOPY

2004 ◽  
Vol 18 (28n29) ◽  
pp. 1441-1447 ◽  
Author(s):  
P. PǍŞCUŢǍ ◽  
I. ARDELEAN
Keyword(s):  
Raman Spectroscopy ◽  
Local Structure ◽  
Structural Investigation ◽  
Glass Structure ◽  
Structural Units ◽  
Structure Of Glasses

Two vitreous systems, x Fe 2 O 3·(100-x)[3 B 2 O 3· MO ] ( MO ⇒ KCl or CaCl 2) with 0≤x≤5 mol %, were characterized by Raman spectroscopy in attempt to determine the local structure of glasses. The mode of which glass structure is influenced by Fe 2 O 3 and CaCl 2-replacement of KCl , is established. The results show that BO 3 and BO 4 are the main structural units of the glass systems.

Evaluation of solid state of rice flours produced by different milling processes using ATR-FTIR spectroscopy

2021 ◽  
Author(s):  
Daitaro Ishikawa ◽  
Jiamin Yang ◽  
Chiaki Ichikawa ◽  
Tomoyuki Fujii
Keyword(s):  
Solid State ◽  
Ir Spectra ◽  
Ftir Spectroscopy ◽  
Water Activity ◽  
Rice Flour ◽  
Milling Process ◽  
Adsorption Properties ◽  
Water Molecules ◽  
Rice Flours ◽  
Changes Of State

ABSTRACT This study evaluated the influence of the milling process on solid state of rice flours according to water activity using ATR-FTIR. A band at 1740 cm−1 attributed to the C=O stretching of lipids was detected for crystalline samples, and it disappeared at a high aw range. The CH band at 2930 cm−1 of crystalline samples gradually shifted to a higher wavenumber with aw. This band of the α-formed and wet-milled samples shifted to higher wavenumbers above 0.8aw. A band due to OH stretching mode in the 3500-3000 cm−1 region did not shift with aw. The result obtained from IR spectra suggests that the parameter K calculated by Guggenheim–Anderson–de Boar model reflected not only the interaction between water molecules but also the changes of state in solids. Consequently, the results from this study provide insights about the adsorption properties of nonideal solids such as rice flour.

Local structure of glasses in the As2S3Sb2S3 system

1995 ◽  
Vol 192-193 ◽  
pp. 191-194 ◽  
Author(s):  
M.A. El Idrissi Raghni ◽  
P.E. Lippens ◽  
J. Olivier-Fourcade ◽  
J.C. Jumas
Keyword(s):  
Local Structure ◽  
Structure Of Glasses
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