Structural and Optical Properties of Li2O–NaF–ZnO–P2O5:(CdO + S) Glass System

2017 ◽  
Vol 6 (1) ◽  
pp. 108-115 ◽  
Author(s):  
Mohammed A. Algradee ◽  
A. A. Higazy ◽  
S. Wageh
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Molar Volume ◽  
Absorption Spectra ◽  
Spectral Range ◽  
Glass Matrix ◽  
Structural Changes ◽  
Quenching Method ◽  
The Fourier Transform

Glasses having composition 5Li2O-33NaF-7ZnO-55P2O5: x wt% (CdO + S) where x = 0.0, 1.0, 2.0, 3.0 and 4.0 wt%, were prepared by the melt quenching method and their amorphous nature was confirmed by X-ray diffraction technique. Variations in density (ρ), molar volume (Vm) and glass transition temperature (Tg) have been correlated with structural changes in the glass matrix. The optical absorption spectra of the polished samples were recorded in spectral range from 200 to 1000 nm at room temperature. The optical band gap (Eopt.) and Urbach energy (ΔE) were determined from the absorption spectra. These parameters (Eopt., ΔE) were found to vary depending on the composition of the glasses. The Fourier-transform Infrared (FTIR) spectra have been recorded in the spectral range from 400 to 4000 cm–1. The FTIR reveals that the addition of Cd2+ ions provide ionic cross-linking between the non-bridging oxygen of different chains and increasing the bond strength of this ionic cross-link which confirmed by decrease in the molar volume and increase in the glass transition temperature when (CdO + S) content is increased. The compositional dependences of the above properties are discussed and correlated with the structural changes in glass matrix.

Thermo-mechanical properties and thermal conductivity of CdS-trans-polyisoprene, polymer nanocomposite

2011 ◽  
Vol 31 (2-3) ◽  
Author(s):  
Mahesh Baboo ◽  
Manasvi Dixit ◽  
Dinesh Patidar ◽  
Kananbala Sharma ◽  
Narendra Sahai Saxena
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Storage Modulus ◽  
Structural Changes ◽  
Polymer Nanocomposite ◽  
Cds Nanoparticles ◽  
Chemical Route

Abstract This paper focuses on the comparative evaluation of the glass transition temperature (Tg), storage modulus and thermal conductivity of trans-polyisoprene (TPI) and CdS-TPI nanocomposite. The CdS nanoparticles synthesized by chemical route are dispersed into TPI using ultrasonic vibrations. Particle size of nanocrystals is obtained from X-ray diffraction and found to be 1.84 nm. Thermo-mechanical properties (Tg and storage modulus) are measured by dynamic mechanical analyzer (DMA), while thermal conductivity is a measured using the transient plane source (TPS) technique. It is observed that glass transition temperature and thermal conductivity are higher while storage modulus and mechanical properties are lower for CdS-TPI nanocomposites than for pure TPI. This has been explained on the basis of structural changes occurring due to introduction of CdS as filler into the TPI.

scholarly journals On the glass transition temperature T against molar volume V plotting in arsenoselenide glasses

2020 ◽  
Vol 528 ◽  
pp. 119758 ◽  
Author(s):  
M. Shpotyuk ◽  
J. Szlęzak ◽  
Y. Shpotyuk ◽  
C. Boussard-Pledel ◽  
B. Bureau ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Molar Volume

Ultrasonic Properties of a Ti47.4Zr5.3Ni5.3Cu42 Glassy Alloy during Progressive Devitrification

2007 ◽  
Vol 561-565 ◽  
pp. 1371-1374 ◽  
Author(s):  
Ichiro Seki ◽  
Mikio Fukuhara ◽  
Akihisa Inoue
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Structural Relaxation ◽  
Structural Changes ◽  
Poisson Ratio ◽  
Glassy Alloy ◽  
Acoustic Characteristics ◽  
Ultrasonic Properties ◽  
Devitrification Process

Although a Ti47.4Zr5.3Ni5.3Cu42 glassy alloy does not occur precipitation of crystalline in annealing of prolonged time below glass transition temperature, it shows slightly embrittlement during passing through devitrification process. The embrittlment behavior may be connected to structural relaxation. Using ultrasonic, in this study, acoustic characteristics of the glassy alloy during progressive devitrification were examined in terms of structural relaxation. The structural changes are characterized by decreases in specific volume, bulk modulus, Lamè parameter and Poisson ratio, accompanied by structural relaxation.

Porosity and the Effect of Structural Changes on the Mechanical Glass Transition Temperature

2007 ◽  
Vol 55 (6) ◽  
pp. 2459-2466 ◽  
Author(s):  
Stefan Kasapis ◽  
Shyam S. Sablani ◽  
M. Shafiur Rahman ◽  
Insaf M. Al-Marhoobi ◽  
Issa S. Al-Amri
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Structural Changes

Preparation of π-vi Semiconductor Nanocrystallites in a Glass Matrix Using Chalcogenizing Agent: Application to cdse

1994 ◽  
Vol 346 ◽  
Author(s):  
J.L. Marc ◽  
W. Gramer ◽  
A. Pradel ◽  
M. Ribes ◽  
T. Richard ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Glass Matrix ◽  
Sodium Borosilicate Glass ◽  
Electron Hole ◽  
Starting Solution ◽  
Crystallite Sizes ◽  
Size Dispersion

ABSTRACTA new route for preparing CdX (X = S, Se, Te, S+Se) nanocrystallites dispersed in a sodium borosilicate glass matrix from a hydrogel is proposed. Chalcogenizing complexing molecules - for instance a mixture of NH4SCN + H2SeO3 - introduced in the starting solution allowed an in situ crystallite preparation concomitant to gel densification. Prevention of crystallite oxidation is thus obtained. Moreover, coalescence is minimized because of the low gel-glass transition temperature. Low temperature absorption spectra have been interpreted in terms of exciton and electron-hole confinements, accounting for both an intrinsic broadening of energy states inside each nanocrystal and a Gaussian size distribution. Crystallite sizes and size dispersion can be adjusted by changing the initial Cd concentration. The crystallinity of the nanoparticles without change in dispersion is strongly improved by thermal treatment above the Tg of the glass matrix.

Structural changes in amorphous arsenic triselenide below the glass-transition temperature

1993 ◽  
Vol 164-166 ◽  
pp. 1239-1242 ◽  
Author(s):  
Hiroyoshi Naito ◽  
Hitoshi Amii ◽  
Masahiro Okuda ◽  
Tatsuhiko Matsushita
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Structural Changes ◽  
Arsenic Triselenide

Bulk amorphous Pd–Ni–Fe–P alloys: Preparation and characterization

1999 ◽  
Vol 14 (5) ◽  
pp. 2107-2115 ◽  
Author(s):  
T. D. Shen ◽  
Y. He ◽  
R. B. Schwarz
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Molar Volume ◽  
Amorphous Alloys ◽  
Composition Range ◽  
Glass Transition Temperatures ◽  
Bulk Amorphous Alloys ◽  
The Difference ◽  
Quenching Method ◽  
Chemically Selective

Bulk amorphous alloys of PdxNiyFe80−x−yP20 (25 ≤ x ≤ 60, 20 ≤ y ≤ 55, x + y ≥ 60) were prepared by a flux-melting and water-quenching method. Seven-mm diameter glassy rods of Pd40Ni40−xFexP20 (0 ≤ x ≤ 20) were studied in greater detail. For these alloys, the difference between the crystallization and glass transition temperatures ranges from 102 K for x = 0 to 53 K for x = 20. In this composition range, the reduced glass transition temperature, Trg, ranges from 0.66 to 0.57. The change in density upon crystallization ranges from 0.24 ± 0.04% for x = 0 to 1.33 ± 0.24% for x = 10. The partial molar volume of Fe in amorphous Pd40Ni40−xFexP20 alloys is significantly larger than the molar volume of (metastable) fcc Fe. This, as well as a comparison with the molar volumes of crystalline compounds, suggests chemically selective Fe–Pd bonding in these glasses.

Effects of Polar Solvent on the Structure and Properties of M-Aramid Fibers

2012 ◽  
Vol 441 ◽  
pp. 169-173 ◽  
Author(s):  
Hua Peng Zhang ◽  
Xin Xing Feng ◽  
Hai Lin Zhu ◽  
Jian Yong Chen
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Structural Changes ◽  
Polar Solvent ◽  
Fiber Structure ◽  
Aramid Fibers ◽  
Solvent Treatment ◽  
Dimensional Changes ◽  
Dyeing Process

The effects of polar solvent on the surface morphology, glass transition temperature, crystalline structure, dimensional changes and dye uptakes of m-aramid fibers were characterized by SEM, DSC, XRD, FTIR and dyeing process after dimethyl sulfoxide (DMSO) solvent treatment under different conditions. After DMSO solvent treatment, the surface of the fiber is roughened, the diameter of the fiber increases, and the specific surface area is increased. The crystallite size shows a little increase, but the glass transition temperature of the fiber drops sharply. Electron diffraction shows that effects of DMSO on the fiber structure is non-uniform, and the obvious structural changes lie on the outer surface of the fiber. Dye uptake increase has been achieved through the DMSO induced structural changes. The results have been used to improve the dyeability of meta-aramid fiber.

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