Role of Bi2O3 content on physical, optical and vibrational studies in Bi2O3–ZnO–B2O3 glasses (original) (raw)
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Study of structure and properties of ZnO–Bi2O3–P2O5 glasses
Journal of Materials Science, 2007
Glasses of the ternary system ZnO-Bi 2 O 3 -P 2 O 5 were prepared and studied in two compositional series 50ZnO-xBi 2 O 3 -(50x)P 2 O 5 and (50y)ZnO-yBi 2 O 3 -50P 2 O 5 . Two distinct glass-forming regions were found in the 50ZnO-xBi 2 O 3 -(50x)P 2 O 5 glass series with x = 0-10 and 20-35 mol.% Bi 2 O 3 . All prepared Bi 2 O 3containing glasses reveal a high chemical durability. Small additions of Bi 2 O 3 (~5 mol.%) improve thermal stability of glasses. All glasses crystallize on heating within the temperature range of 505-583°C. Structural studies by Raman and 31 P MAS NMR spectroscopies showed the rapid depolymerisation of phosphate chains within the first region with x = 0-15 and the presence of isolated Q 0 phosphate units within the second region with x = 20-35. Raman studies showed that bismuth is incorporated in the glass structure in BiO 6 units and their vibrational bands were observed within the spectral region of 350-700 cm -1 . The evolution of properties and the spectroscopic data are both in accordance with a network former effect of Bi 2 O 3 .
Structural and thermal stability criteria of Bi 2 O 3 –B 2 O 3 glasses
Journal of Physics: Condensed Matter, 2008
Glasses with compositions xBi 2 O 3 -(100 − x)B 2 O 3 with 30 x 60 mol% have been prepared using the normal melt quenching technique. Infrared (IR) spectroscopy was used as a structural probe of the nearest-neighbor environment in the glass network. Assessment of the thermal stability of these glasses was achieved in terms of various simple quantitative methods based on the characteristic temperatures, such as the glass transition temperature, T g , the onset temperature of crystallization, T in , the temperature corresponding to the maximum crystallization rate, T p , and the melting temperature, T m . In this case, k gl may be more suitable for estimating the glass thermal stability in the above composition range. In this work the kinetic parameter K r (T ) is added to the stability criteria. The thermal stability of the glasses that were studied has been correlated with the activation energy of crystallization by this kinetic criterion and compared with those evaluated by other criteria. The results of both the criteria and the kinetic parameter K r (T ) confirm that the thermal stability decreases with increasing Bi 2 O 3 content. The former parameters, besides the average force constant of the BO 3 structural unit, were characterized and discussed in terms of the changes in the glass structure.
Spectroscopic properties, electronic polarizability, and optical basicity of Bi2O3–Li2O–B2O3 glasses
Physica B: Condensed Matter, 2008
Glasses with compositions Li 0.5 B 1.5À2x Bi 2x O 2.5 , 0pxp0.4, have been prepared using the normal melt quenching technique. The density and the molar volume have been determined. Infrared (IR) spectroscopy is used as a structural probe of the nearest neighbor environment in the glass network. The optical transmittance and reflectance spectrum of the glasses have been recorded in the wavelength range 300-1100 nm. The values of the optical band gap E opt g for indirect transition and refractive index have been determined for different compositions of the amorphous glass. The average electronic polarizability of the oxide ion a 2À O and the optical basicity have been estimated from the values of calculated refractive indices. The compositional dependence of different physical parameters such as the density, the molar volume, the optical band gap, the refractive index, the average electronic polarizability of the oxide ion, and the optical basicity on Bi 2 O 3 content have been analyzed and discussed. r
Glass formation and structural studies of glasses in the TeO2 – ZnO – Bi2O3 – Nb2O5 system
Journal of Non-Crystalline Solids, 2019
In this study we determined the glass formation region in the TeO 2-ZnO-Bi 2 O 3-Nb 2 O 5 system. The investigation covers TeO 2-based glasses containing ZnO (from 10 to 40 mol%), Bi 2 O 3 (6-10 mol%) and Nb 2 O 5 (6-10 mol%). The glasses obtained were transparent and yellow in colour. The thermal stability of the samples determined by DTA was found to be about 100°C. Some physical characteristics (density, molar volume, oxygen molar volume and oxygen packing density) were estimated as well. The analysis of IR spectra showed that the network of glasses consists mainly of TeO 4 (tbp) units, while Raman spectroscopy revealed the existence of TeO 4 (tbp), TeO 3+1 and TeO 3 (tp) units. The UV-Vis spectroscopy established a red shifting of the cutoff depending on composition and the glass rich in TeO 2 exhibited cutoff at about 388 nm while that with low TeO 2 content was 378 nm.
Effect of BaO on physical, optical and structural characteristics of ZnO– Al2O3–B2O3 glasses
JOURNAL OF ADVANCES IN PHYSICS, 2015
Zinc barium borate glasses with composition (65-x) B2O3-10Na2O-10Al2O3-10ZnO-5Li2O-xBaO with (0 ≤ x ≤40 % mol)have been prepared using melt quenching technique.The density, molar volume and the optical absorption studies revealed that the optical band gap energy (Eopt) and Urbachenergy increase with the increase of BaOcontent.This is mainly due to the increased polarization of theBa2+ ions and theenhanced formation of non-bridging oxygen (NBO). The IR studies indicate that these glasses are made up of [AlO6],[BO3],[BO4], and [AlO4] basic structural units.
2011
Synthesis of a new series of lead free low softening point (<470 o C) high Bi 2 O 3 (40-90 mol %) glasses in the K 2 O-B 2 O 3-Bi 2 O 3 system by the melt-quench technique has been demonstrated here. Their structural, optical, thermal, electrical and other physical properties have been evaluated by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), Fourier transformation infrared reflection spectroscopy (FTIRR), UV-Visible spectroscopy, dilatometer, LCR meter, etc. techniques. The glass softening point, glass transition temperature and glass deformation temperature are found to vary in the ranges 410-465 o C, 354-409 o C and 376-427 o C respectively which are found to correlate well with the boron anomaly phenomenon (as revealed by FT-infrared reflection spectroscopy) with gradual addition of Bi 2 O 3 in the glass matrix. The coefficient of thermal expansion shows a decreasing trend from 153 down to 109 x 10-7 K-1 whereas the dielectric constant increases from 21 to 34 with the increase in Bi 2 O 3 content. The theoretical optical basicity is found to increase from 0.93 to 1.15 while the optical band gap decreases from 2.86 down to 2.30 eV with the addition of Bi 2 O 3. The formation of metallic bismuth in these glasses during melting in air has been confirmed by the X-ray diffraction, transmission electron microscopy, selected area electron diffraction (SAED) and high resolution transmission electron microscopy (HRTEM) analyses. The formation of Bi 2 O 3 rich secondary phase in the glasses and their particle size distribution has been examined by the field emission scanning electron microscopy photomicrograph analysis.
Glass formation and structure of glasses in B2O3―Bi2O3―MoO3 system
Journal of Non-Crystalline Solids, 2011
The purpose of this paper is to study the glass formation tendency in the ternary system B 2 O 3-Bi 2 O 3-MoO 3 and to define the main structural units building the amorphous network. A wide glass formation area was determined which is situated near the Bi 2 O 3-B 2 O 3 side. A liquid phase separation region was observed near the MoO 3-B 2 O 3 side for compositions containing below 25 mol% Bi 2 O 3 and their microheterogeneous structure was observed by SEM. The phase formation was characterized by X-ray diffraction (XRD). By DTA was established the glass transition temperature (T g) in the range of 380-420°C and crystallization temperature (T x) vary between 420 and 540°C. The main building units forming the amorphous network are BO 3 (1270 and 1200 cm − 1), BO 4 (930-880, 1050-1040 cm − 1), MoO 4 (840-760 cm − 1) and BiO 6 (470 cm − 1). It was proved that Bi 2 O 3 favors the BO 3 → BO 4 transformations while MoO 3 preserves BO 3 units in the amorphous network.
Synthesis and Characterization of ZnO-Na2O-Bi2O3-B2O3 Glass System
IRJET, 2022
Glasses are characterized by very large possibilities of compositions. There are in fact some hundreds of thousands possible compositions of glasses. The aim of the present study is to prepare quaternary glass systems with the compositions xZnO-(30-x)Na2O-36Bi2O3-34B2O3,(the values of x ranging from 5 to 25 in mol% in steps of 5) by using melt quenching technique. We call the glasses of different compositions obtained with five different names G1, G2, G3, G4, and G5. The glasses are prepared and the obtained glasses appearance and other physical properties are discussed. X-ray diffraction, Fourier Transform Infrared Spectroscope and Scanning Electron Microscope have been used for the Characterization and study of density of glasses prepared.
2011
Rattler model of the boson peak at silica surfaces J. Chem. Phys. 137, 164702 (2012) Void structure in silica glass with different fictive temperatures observed with positron annihilation lifetime spectroscopy Appl. Phys. Lett. 101, 164103 (2012) Local structure origin of higher glass forming ability in Ta doped Co65B35 amorphous alloy J. Appl. Phys. 112, 073520 (2012) NMR and conductivity studies of the mixed glass former effect in lithium borophosphate glasses Zinc bismuth vanadate glasses with compositions 50V 2 O 5 -xBi 2 O 3 -(50-x) ZnO have been prepared using a conventional melt-quenching method and the solubility limit of Bi 2 O 3 in zinc vanadate glass system has been investigated using x-ray diffraction. Density has been measured using Archimedes' principle; molar volume (V m ) and crystalline volumes (V c ) have also been estimated. With an increase in Bi 2 O 3 content, there is an increase in density and molar volume of the glass samples. The glass transition temperature (T g ) and Hurby coefficient (K gl ) have been determined using differential scanning calorimetry (DSC) and are observed to increase with increase in Bi 2 O 3 content (i.e., x), up to x ¼ 15, thereby indicating the structural modifications and increased thermal stability of zinc vanadate glasses on addition of Bi 2 O 3 . FTIR spectra have been recorded and the analysis of FTIR shows that the structure depends upon the Bi 2 O 3 content in the glass compositions. On addition of Bi 2 O 3 into the zinc vanadate system, the structure of V 2 O 5 changes from VO 4 tetrahedral to VO 5 trigonal bi-pyramid configuration. The optical parameters have been calculated by using spectroscopic ellipsometry for bulk oxide glasses (perhaps used first time for bulk glasses) and optical bandgap energy is found to increase with increase in Bi 2 O 3 content.
Optical and structural properties of ZnO PbO B2O3 and ZnO PbO B2O3 SiO2 glasses
Journal of Physics-condensed Matter, 2008
Borate and borosilicate glasses with compositions of xZnO-2xPbO-(1-3x)B2O3 and xZnO-2xPbO-1/2(1-3x)B2O3-1/2(1-3x)SiO2 with x varying from 0.1 to 0.26 mole fraction were prepared by the conventional melt quench technique. Optical and structural properties have been determined by using ultraviolet-visible (UV/vis) and Fourier transform infrared (FTIR) spectroscopic techniques. Decreases in the band gap from 3.57 to 2.62 eV for borate glasses and from 3.00 to 2.35 eV for borosilicate glasses with an increase in the metal oxide content is observed. The density and molar volume has also been measured. Increases in density from 3.994 to 6.339 g cm-3 for borate and from 4.221 to 6.548 g cm-3 for borosilicate glasses are observed with an increase in metal oxide (PbO, ZnO or PbO+ZnO) content. Changes in the atomic structure with composition are observed due to the formation of BO4- units.