scholarly journals Investigation on Structure of TeO2-B2O3-SiO2-Al2O3-KF Glasses

2020 ◽  
Vol 36 (2) ◽  
Author(s):  
Phan Van Do
Keyword(s):  
Optical Band Gap ◽  
Urbach Energy ◽  
Thermal Studies ◽  
Glass Network ◽  
X Ray Diffraction ◽  
Melt Quenching ◽  
X Ray ◽  
Thermal Analyzer ◽  
Amorphous Nature ◽  
Xrd Patterns

Borotellurite glasses were prepared by melt quenching technique. Amorphous nature of samples was confirmed through X-ray diffraction (XRD) patterns. Effect of B2O3 content on the structure of glass network was studied through Fourier-transform infrared spectroscopy (FTIR) spectra. Optical band gap and Urbach energy were found from analysis of optical absorption spectra. Thermal studies were carried out by using Differential thermal analyzer (DTA) measurements.

scholarly journals Optical and thermal properties of TeO2–B2O3–Gd2O3 glass systems

2019 ◽  
Vol 37 (4) ◽  
pp. 517-525
Author(s):  
C. Eevon ◽  
M.K. Halimah ◽  
M.N. Azlan ◽  
R. El-Mallawany ◽  
S.L. Hii
Keyword(s):  
Thermal Properties ◽  
Room Temperature ◽  
Optical Band Gap ◽  
Urbach Energy ◽  
Glass Network ◽  
X Ray Diffraction ◽  
X Ray ◽  
Amorphous Nature ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

AbstractNew glass samples with composition (1 – x)[(TeO2)70(B2O3)30] – x(Gd2O3) with x = 0.2, 0.4, 0.6, 0.8 and 1.0 in mol% have been synthesized by conventional melt-quenching techniques. X-ray diffraction (XRD) studies were performed in order to confirm the amorphous nature of the samples. The density of the samples has been found to vary with the Gd2O3 content, whereas an opposite trend has been observed in the molar volume. The analysis of Fourier Transform Infrared (FT-IR) spectroscopy of the samples showed that the glass network is mainly built of TeO3, TeO4, BO3 and BO4 units. The addition of Gd2O3 changed the refractive index, optical band gap and Urbach energy of the glass samples. The thermal properties of the studied glasses were investigated by measuring the thermal diffusivity of the samples by using photoflash method at room temperature.

Physical and Structural Properties of Dysprosium Doped Barium Borate Glass

2019 ◽  
Vol 290 ◽  
pp. 46-52 ◽  
Author(s):  
Norihan Yahya ◽  
Mardhiah Abdullah ◽  
Mohamed Najmi Naquib Mohamed Zainal Abidin ◽  
Azman Kasim ◽  
Azhan Hashim
Keyword(s):  
Molar Volume ◽  
Structural Properties ◽  
Borate Glass ◽  
Glass Network ◽  
Barium Borate ◽  
X Ray Diffraction ◽  
Melt Quenching ◽  
X Ray ◽  
Amorphous Nature ◽  
Barium Borate Glass

Five distinguish glass samples were prepared by melt quenching technique of the composition (81-x)H3BO3-19BaCO3-xDy2O3 with x = 0, 0.2, 0.4, 0.6 and 0.8 mol%. The effect of Dy3+ to the barium borate glass can be investigated in terms of their physical properties such as density, molar volume and oxygen packing density. The structural properties were analyzed by X-Ray Diffraction (XRD) technique and Fourier Transform Infrared Spectroscopy (FTIR). The result revealed that the increment of mol% of Dy3+ in the compound generally will increases the density and molar volume of the glass samples. The amorphous nature of the glass system was verified from the XRD spectra pattern. Meanwhile, the FTIR spectra shown the presence of Ba2+, BO3, BO4, B-O-B linkage, H-O-H and isolated borate in the glass network.

Optical Absorption of Er3+/Nd3+ Co-Doped Tellurite Glass

2012 ◽  
Vol 501 ◽  
pp. 96-100 ◽  
Author(s):  
S. Akmar Roslan ◽  
M. Rahim Sahar ◽  
Ramli Arifin ◽  
Sib Krishna Ghoshal ◽  
M. Supar Rohani ◽  
...  
Keyword(s):  
Tellurite Glass ◽  
Optical Band Gap ◽  
Urbach Energy ◽  
Tellurite Glasses ◽  
X Ray Diffraction ◽  
Melt Quenching ◽  
X Ray ◽  
Diffraction Patterns ◽  
Quenching Method ◽  
Co Doped

Tellurite glasses of varying Er3+/Nd3+ concentration were successfully prepared by melt-quenching method. The X-Ray diffraction pattern was determined by using Siemens Diffractometer D5000 while the optical properties were measured using Shimadzu 3101 pc UV-VIS NIR scanning spectrophotometer. It was found that the diffraction patterns of all samples showed glasses characteristics. The optical band gap, Eopt¬ increased proportionally with the content of Er¬2O3 but Urbach energy, ∆E decreased due to the increasing Er2O3 contents.

Effect of Dysprosium Nanoparticles on the Optical Properties of Zinc Borotellurite Glass Systems

2017 ◽  
Vol 268 ◽  
pp. 13-17 ◽  
Author(s):  
M.N. Ami Hazlin ◽  
Mohamed Kamari Halimah ◽  
Farah Diana Mohammad ◽  
M.F. Faznny ◽  
Shahrim Mustafa Iskandar
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Optical Band Gap ◽  
Urbach Energy ◽  
Molar Fraction ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Amorphous Nature

The glass samples of zinc borotellurite glass doped with dysprosium nanoparticles with chemical formula TeO20.7B2O30.30.7ZnO0.31-xDy2O3x (where x= 0.01, 0.02, 0.03, 0.04 and 0.05 molar fraction) have been fabricated by using melt quenching technique. In this study, the structural and optical properties of the zinc borotellurite glass doped with dysprosium nanoparticles were characterized by using X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and UV-Vis spectroscopy. From the XRD, the amorphous nature of the glass samples has been confirmed. The infrared spectra revealed four obvious bands which are assigned for BO3, BO4 and TeO4 vibrational groups. The direct and indirect optical band gap, as well as Urbach energy, was calculated through absorption spectra obtained from UV-Vis spectroscopy. From the spectra, it is observed that both direct and indirect optical band gap decreases as the concentration of dysprosium nanoparticles increase. Other than that, the Urbach energy is observed to have an inverse trend with the optical band gap. The Urbach energy is increases as the concentration of dysprosium nanoparticles increases.

scholarly journals FTIR and Optical Properties of NiO Doped Cr2O3 Nanopar-ticles Synthesis by Hydrothermal Method

2018 ◽  
Vol 29 (1) ◽  
pp. 168
Author(s):  
Tunis Balassim Hassan
Keyword(s):  
Optical Band Gap ◽  
Average Crystallite Size ◽  
Structural Behavior ◽  
X Ray Diffraction ◽  
Nanopar Ticles ◽  
Hydrothermal Technique ◽  
X Ray ◽  
Cr2o3 Nanoparticles ◽  
Xrd Patterns ◽  
Scanning Electron

Pure and Nickel oxide doped chromium (III) oxide (Cr2O3) nanoparticals are synthesized by hydrothermal technique. The effect of dopant Ni concentration on the structural behavior of Cr2O3 nanoparticles was examined by X-ray diffraction. The average crystallite size of the synthesized nanoparticles was measured from XRD patterns using Scherrer equation and was decreased from 22nm to 12.9 nm with the increasing Nio concentration in Cr2O3 from (0, 0.01, 0.06, and 0.10). Morphologies and compositional elements of the synthesized nanoparticles were observed by the field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) spectroscopy, respectively. The optical property of the samples was measured by ultraviolet - visible (UV-Vis.) absorption spectroscopy. The observed optical band gap value ranges from 2.3eV to 2.5eV for Ni doped nanoparticles

Optical Properties of Silica Borotellurite Glass Doped with Manganese Oxide

2017 ◽  
Vol 268 ◽  
pp. 18-22 ◽  
Author(s):  
I. Zaitizila ◽  
Mohamed Kamari Halimah ◽  
Farah Diana Mohammad ◽  
Mohd Shah Nurisya
Keyword(s):  
Optical Properties ◽  
Manganese Oxide ◽  
Band Gap ◽  
Diffraction Pattern ◽  
Optical Band Gap ◽  
Urbach Energy ◽  
Molar Fraction ◽  
Chemical Formula ◽  
Melt Quenching ◽  
Amorphous Nature

Silica borotellurite glasses doped with manganese oxide with chemical formula {[(TeO2)0.7(B2O3)0.3­]0.8[SiO2]0.2}1-x{MnO2}x (where x = 0.0, 0.01, 0.02, 0.03, 0.04 and 0.05 molar fraction) were fabricated. Silica were extracted from the burning process of rice husk. Glass samples were prepared by using the melt-quenching technique. The FTIR spectra showed that the addition of MnO₂ contributed to the transformation of TeO4 to TeO3. The diffraction pattern of XRD showed a broad hump which indicates the amorphous nature of the samples. The result for both optical band gap and Urbach energy showed decreasing trend as the concentration of manganese increased.

Physical and spectroscopic studies on manganese ions in lead halo borate glasses

2017 ◽  
Vol 31 (16) ◽  
pp. 1750180 ◽  
Author(s):  
K. Chandra Sekhar ◽  
Abdul Hameed ◽  
G. Ramadevudu ◽  
M. Narasimha Chary ◽  
Md. Shareefuddin
Keyword(s):  
Optical Band Gap ◽  
Urbach Energy ◽  
Spectroscopic Studies ◽  
Manganese Ions ◽  
X Ray Diffraction ◽  
Ionic Radii ◽  
X Ray ◽  
Prepared Glass ◽  
Splitting Constant

Lead halo borate glass systems containing manganese ions have been investigated to study the role of halide ions on the physical, optical and EPR studies. The amorphous phase of the prepared glass samples [Formula: see text]PbX2–(30[Formula: see text])PbO–69.5B2O3–0.5MnO2 with X = F, Cl and Br and [Formula: see text] mol% was confirmed from their X-ray diffraction spectra. Ionic radii of the halides played an important role in the physical properties. From the optical absorption spectra, optical band gap and Urbach energy values were evaluated. The EPR spectra have shown a six-line hyperfine (HF) structure centered at [Formula: see text] and attributed to Mn[Formula: see text] centers in octahedral symmetry. The other signals at [Formula: see text] and 4.3 were attributed to the rhombic surroundings of Mn[Formula: see text] ions. The negative shift in [Formula: see text]-value revealed highly ionic environment around the Mn[Formula: see text] ion in the glass hosts. The HF splitting constant (A), number of spins (N) and susceptibility [Formula: see text] values of the prepared glasses were also reported.

scholarly journals Optical and Electrical Properties of Nd3+doped Na2O-ZnO-TeO2 Material

2021 ◽  
Vol 12 (6) ◽  
pp. 7927-7941
Keyword(s):  
Optical Band Gap ◽  
Large Range ◽  
Emission Spectra ◽  
Band Gap Energy ◽  
Optical And Electrical Properties ◽  
X Ray Diffraction ◽  
Melt Quenching ◽  
X Ray ◽  
Gap Energy ◽  
Dta And Tg

Neodymium-doped Na2O-ZnO-TeO2 (NZT) glasses were prepared by the conventional melt quenching technique. DTA and TG were used to confirm glass preparation through the glass transition temperature at 447°C for the glass system. The analysis of FTIR spectra and X-ray diffraction described the samples' nature as ionic and amorphous, respectively. The optical band gap energy was estimated using absorption spectra and found to be decreased from 2.63eV to 1.32 eV due to the increase of doping concentration. The intensity of the emission spectra was enhanced for the higher concentration of Nd3+ ions. The dielectric constant of the glass samples was found to be constant for the large range of frequency (3 kHz to 1 MHz). The variation of conductivity with the temperature of the samples had shown the Arrhenius mechanism of conduction.

Effect of Samarium Ions on Physical and Optical Properties of Zinc Borotellurite Glass System

2021 ◽  
Vol 317 ◽  
pp. 100-108
Author(s):  
Siti Nasuha Mohd Rafien ◽  
Azman Kasim ◽  
Norihan Yahya ◽  
Azhan Hashim ◽  
Wan Aizuddin Wan Razali
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Molar Volume ◽  
Optical Band Gap ◽  
Urbach Energy ◽  
Glass System ◽  
X Ray Diffraction ◽  
Indirect Transition ◽  
Vis Spectroscopy ◽  
Amorphous Nature

Modifying the physical and optical properties of zinc borotellurite glasses by controlling rare earth (RE) doping is important in order to obtain high quality glass. In this study, Samarium (Sm3+) doped zinc borotellurite glasses were successfully fabricated by using conventional melt-quenching technique with chemical composition (where x = 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol%). The physical properties by mean of their density as well as molar volume were measured while the optical properties have been studied through UV-Vis spectroscopy in order to determine the optical band gap (Eopt) and Urbach energy (ΔΕ) of the glass system. Optical absorption spectra of the glass samples were recorded in the range 350 nm - 750 nm at room temperature. The amorphous nature of the glass was confirmed from X-ray diffraction techniques. The density and molar volume of the glass samples were found to vary with respect to Sm3+ ions content. The value of optical band gap, Eopt lies between 2.605 eV to 2.982 eV for the direct transition and 2.768 eV to 3.198 eV for the indirect transition respectively. Meanwhile, the Urbach energy, ΔE was observed in the range of 0.112 eV to 0.694 eV respectively. The physical and optical properties were found to be strongly affected by the varying concentration of Sm3+ ions. Some other results will be analysed and discussed in detail.

OPTICAL AND SPECTROSCOPIC STUDIES OF Fe2O3-Bi2O3-B2O3:V2O5 GLASSES

2013 ◽  
Vol 27 (28) ◽  
pp. 1350207
Author(s):  
SANJAY ◽  
N. KISHORE ◽  
A. AGARWAL ◽  
S. DAHIYA ◽  
INDER PAL ◽  
...  
Keyword(s):  
Optical Band Gap ◽  
Transition Metal Ions ◽  
Amorphous Solids ◽  
Spectroscopic Studies ◽  
Band Gap Energy ◽  
Melt Quenching ◽  
Gap Energy ◽  
Amorphous Nature ◽  
Urbach’S Energy ◽  
Xrd Patterns

The glasses of compositions x Fe 2 O 3⋅ (40 - x) Bi 2 O 3⋅60 B 2 O 3⋅2 V 2 O 5 have been prepared by the standard melt-quenching technique. Amorphous nature of these samples is ascertained by XRD patterns. The presence of BO 3 and BO 4 units is identified by IR spectra of glass samples. The absorption edge (λ cut-off ) shifts toward longer wavelengths with an increase in Fe 2 O 3 content in the glass matrix. The values of optical band gap energy for indirect allowed and forbidden transitions have been determined and it is found to decrease with increase in transition metal ions. The Urbach's energy is used to characterize the degree of disorder in amorphous solids.

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