scholarly journals Effect of Concurrent ZnO Addition and AlF3Reduction on the Elastic Properties of Tellurite Based Glass System

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Haji Abdul Aziz Sidek ◽  
Raouf El-Mallawany ◽  
Krishnaswamy Hariharan ◽  
Shaharuddin Rosmawati
Keyword(s):  
Glass Sample ◽  
Room Temperature ◽  
Ultrasonic Waves ◽  
Glass System ◽  
Velocity Data ◽  
Compositional Dependence ◽  
Ultrasonic Velocities ◽  
Melt Quenching ◽  
Rapid Melt Quenching ◽  
Longitudinal Modulus

New ternary zinc oxyfluorotellurite (ZOFT) with the composition(ZnO)x-(AlF3)y-(TeO2)z, where5≤x<35;5≤y≤25;60≤z≤70, has been successfully prepared by the conventional rapid melt quenching technique. Density, molar volume, and glass transition temperature have been assessed for each ZOFT glass sample. The longitudinal and transverse ultrasonic waves propagated in each glass sample were measured using a MBS8020 ultrasonic data acquisition system at 5 MHz frequency and room temperature. The longitudinal modulus (L), shear modulus (G), Young’s modulus (E), bulk modulus (K), and Poisson’s ratio (σ) are assessed from both velocity data and their respective density. The compositional dependence of the ultrasonic velocities and related parameters are discussed to understand the rigidity and compactness of the glass system studied.

Coloration in Soda-Lime-Silicate Glass System Containing Manganese

2010 ◽  
Vol 93-94 ◽  
pp. 206-209 ◽  
Author(s):  
N. Srisittipokakun ◽  
C. Kedkaew ◽  
Jakrapong Kaewkhao ◽  
Pichet Limsuwan
Keyword(s):  
Silicate Glass ◽  
Base Composition ◽  
Glass Sample ◽  
Room Temperature ◽  
Soda Lime ◽  
Glass System ◽  
Allowed Transition ◽  
Visible Spectra ◽  
Uv Visible ◽  
Soda Lime Silicate Glass

The UV-visible spectra of soda-lime-silicate glass system with the base composition (65-x) SiO2: 10CaO: 25Na2O: xMnO2 % mol, (where x is 0.0, 0.02, 0.05, 0.10, 0.30 and 0.50 %mol) were studied at room temperature. The results are shown that the colors of glass samples were altered from colorless to dark purple with increasing of MnO2 concentration and were stable at room temperature. The color of glass sample with 0.3 %mol MnO2 was purple. Moreover, it has been found that the density and refractive index were contiguous. The optical absorption spectra can be confirmed the color of these glass samples. They exhibited a predominant broadband around 500 nm and it was clearly observed, its increasing since 0.1 %mol of MnO2. This band corresponds to an allowed transition from 5Eg5T2g, which attributed to Mn3+. When increasing MnO2 concentration, the absorption band due to Mn3+ ion was dominating.

Formation of a unique glass by spark plasma sintering of a zeolite

2009 ◽  
Vol 24 (10) ◽  
pp. 3241-3245 ◽  
Author(s):  
Lianjun Wang ◽  
Wan Jiang ◽  
Lidong Chen ◽  
Zhijian Shen
Keyword(s):  
Spark Plasma Sintering ◽  
Glass Sample ◽  
Room Temperature ◽  
Vickers Microhardness ◽  
Simple Approach ◽  
Electron Microscopic ◽  
Plasma Sintering ◽  
Transmission Electron ◽  
Transmission Electron Microscopic ◽  
Spark Plasma

A simple approach, order–disorder transition (ODT), has been developed to synthesize a novel glass using ZSM-5 as starting materials. In this process, the ZSM-5 powders were pressed uniaxially in a graphite die and rapidly sintered using spark plasma sintering (SPS). High-resolution transmission electron microscopic images revealed that a few crystalline zeolite fragments were still preserved locally inside the SPS consolidated sample. Vickers microhardness and fracture toughness of this as-prepared transparent glass sample at room temperature reaches 7.3 ± 0.2 GPa and 2.0 ± 0.3MPa·m1/2, respectively. It is very interesting that these novel bulk transparent glasses exhibit ultraviolet photoluminescence (PL) properties at about ∼360 nm.

Preparation and Properties of La2O3-CaO-P2O5 Glasses Doped with Eu3+ Ions

2016 ◽  
Vol 675-676 ◽  
pp. 376-379 ◽  
Author(s):  
Narun Luewarasirikul ◽  
Piyachat Meejitpaisan ◽  
Jakrapong Kaewkhao
Keyword(s):  
Calcium Phosphate ◽  
Molar Volume ◽  
Absorption Spectra ◽  
Room Temperature ◽  
Emission Spectra ◽  
Phosphate Glasses ◽  
Excitation Wavelength ◽  
Melt Quenching ◽  
Volume Measurements ◽  
Doped Glasses

Lanthanum calcium phosphate glasses doped with Eu3+ ions in compositions 20La2O3:10CaO:(70-x)P2O5:xEu2O3 (where x = 0.05, 0.10, 0.50 and 1.50 mol%) were prepared by melt-quenching technique. The density and molar volume measurements were carried out at room temperature. The absorption spectra were investigated in the UV-Vis-NIR region from 200 to 2500 nm. The emission spectra of Eu3+-doped glasses centered at 590 nm (5D0→7F1), 612 nm (5D0→7F2), 652 nm (5D0→7F3) and 699 nm (5D0→7F4) have been observed with 393 nm excitation wavelength.

scholarly journals Effect of Pb2+ Ions on the Mechanical, Structural and Thermal Behaviour of B2O3-CaO Glasses

2019 ◽  
Vol 32 (1) ◽  
pp. 101-105
Author(s):  
C. Subashini ◽  
R. Ezhil Pavai ◽  
L. Balu
Keyword(s):  
Glass Structure ◽  
Measured Data ◽  
Micro Hardness ◽  
Ultrasonic Velocities ◽  
Structural Units ◽  
Amorphous Nature ◽  
Longitudinal Modulus ◽  
Pulse Echo ◽  
Temperature Melting ◽  
Sem Analyses

B2O3-CaO-PbO glasses with different concentrations of PbO (5-20 mol % in four steps) were prepared by melt quench technique. The amorphous nature and homogeneities of the prepared glasses were confirmed by XRD and SEM analyses. Ultrasonic velocities and density were measured at 303 K using pulse-echo technique and Archimedes’ principle respectively. Various parameters, viz., molar volume, longitudinal modulus, shear modulus, bulk modulus, Young’s modulus, Poisson’s ratio, micro-hardness and Debye temperature have been evaluated from the measured data. The results of ultrasonic properties indicate that the incorporation of lead ions expand the calcium borate network structure. FTIR spectra revealed that boron exists in both trigonal and tetrahedral structural units and no boroxial ring formation takes place in the glass structure. The transition temperature, melting temperature and crystallization temperature have been identified using DTA measurements.

The Effect of Hydrostatic Pressure on Physical Properties and Microstructure of Spruce and Cherry

Holzforschung ◽  
2000 ◽  
Vol 54 (1) ◽  
pp. 83-92 ◽  
Author(s):  
Voichita Bucur ◽  
Simone Garros ◽  
Claire Y. Barlow
Keyword(s):  
Hydrostatic Pressure ◽  
Structural Damage ◽  
Untreated Wood ◽  
Average Density ◽  
Ultrasonic Waves ◽  
Ultrasonic Velocities ◽  
Main Effect ◽  
Natural Wood ◽  
Effect Of Hydrostatic Pressure ◽  
Longitudinal Ultrasonic Waves

Summary The effect of hydrostatic pressure on the density, the ultrasonic velocities and the microstructure of spruce and cherry wood has been studied. Generally speaking, under hydrostatic pressure wood becomes less heterogeneous and less anisotropic than natural wood. In spruce, crushing and buckling of the thin-walled cells in the earlywood takes place. This also has the effect of disrupting the medullary rays, which assume a zig-zag path through the structure. Cherry has a much more homogeneous structure, and the main effect of the hydrostatic pressure is compaction of the vessels by buckling of the walls. The fibres are scarcely affected by the treatment. The width of the earlywood zone decreased after the application of pressure by 26% in spruce, and by 11% in cherry. The average density was increased by the hydrostatic pressure by 26% for spruce and by 46% for cherry. The densitometric profile of spruce demonstrates significant changes following the pressure treatment, with the minimum density DMin increasing and the maximum density DMax decreasing. For cherry, the densitometric profile is shifted rather uniformly towards higher densities, and the annual ring profile is spatially slightly compacted but otherwise similar to that of untreated wood. The anisotropy of wood (expressed by the ratio of acoustic invariants) decreased by 56% for spruce and by 33% for cherry. The structural damage in spruce is predominantly found in the radial (R) direction, and this corresponds to a reduction of 73% in the velocity of the longitudinal ultrasonic waves in the radial direction, VRR. In cherry, the structural damage is mainly in the transverse, T direction. The velocity of the longitudinal ultrasonic waves in the transverse direction, VTT is reduced by 44%. The medullary rays in cherry seem to be the most important anatomical feature influencing the propagation of ultrasonic waves.

scholarly journals Compositional Dependence of Structural Properties of Prepared Alloys and Films

2011 ◽  
Vol 2011 ◽  
pp. 1-6
Author(s):  
M. F. A. Alias ◽  
A. A. J. Al-Douri ◽  
E. M. N. Al-Fawadi ◽  
A. A. Alnajjar
Keyword(s):  
Room Temperature ◽  
Thermal Evaporation ◽  
High Accuracy ◽  
Compositional Dependence ◽  
X Ray Diffraction ◽  
Thermal Evaporation Method ◽  
X Ray ◽  
Glass Substrates ◽  
Different Temperatures ◽  
Good Agreement

Results of a study of alloys and films with various Pb content have been reported and discussed. Films of of thickness 1.5 μm have been deposited on glass substrates by flash thermal evaporation method at room temperature, under vacuum at constant deposition rate. These films were annealed under vacuum around 10−6Torr at different temperatures up to 523 K. The composition of the elements in alloys was determined by standard surfaces techniques such as atomic absorption spectroscopy (AAS) and X-ray fluorescence (XRF), and the results were found of high accuracy and in very good agreement with the theoretical values. The structure for alloys and films is determined by using X-ray diffraction. This measurement reveals that the structure is polycrystalline with cubic structure and there are strong peaks at the direction (200) and (111). The effect of heat treatment on the crystalline orientation, relative intensity, and grain size of films is presented.

Spectroscopic Properties of Rare Earth Ion Doped TeO2-B2O3-PbO Glass

2014 ◽  
Vol 69 (6) ◽  
Author(s):  
A. Noranizah ◽  
K. Azman ◽  
H. Azhan ◽  
E. S. Nurbaisyatul ◽  
A. Mardhiah
Keyword(s):  
Refractive Index ◽  
Rare Earth ◽  
Glass Sample ◽  
Spectroscopic Properties ◽  
Molar Refraction ◽  
Energy Band Gap ◽  
Melt Quenching ◽  
Rare Earth Ion ◽  
Optical Energy Band Gap ◽  
Oxide Ion

This work focuses on the spectroscopic study of RE3+ ion, namely, trivalent neodymium (Nd3+) doped lead borotellurite glass with a composition of TeO2-B2O3-PbO. The glass sample has been prepared by conventional melt-quenching technique. The density, molar volume and optical energy band gap of these glasses have been measured. The refractive index, molar refraction and polarizability of oxide ion have been calculated by using Lorentz-Lorentz relations. The absorption spectra are recorded using UV-Vis-NIR spectrometer in the range of 200-900 nm.

Room temperature dielectric properties of the As40S(60−x)Sex glass system

2000 ◽  
Vol 276 (1-3) ◽  
pp. 151-158 ◽  
Author(s):  
V.Q. Nguyen ◽  
J.S. Sanghera ◽  
I.K. Lloyd ◽  
I.D. Aggarwal ◽  
D. Gershon
Keyword(s):  
Dielectric Properties ◽  
Room Temperature ◽  
Glass System
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