Variation of glass transition temperature, Tg, with average coordination number, 〉m〈, in network glasses: evidence of a threshold behavior in the slope |dTg/d〉m〈 | at the rigidity percolation threshold (〉m〈 = 2.4)

1992 ◽  
Vol 151 (1-2) ◽  
pp. 149-154 ◽  
Author(s):  
M. Zhang ◽  
S. Mancini ◽  
W. Bresser ◽  
P. Boolchand
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Percolation Threshold ◽  
Coordination Number ◽  
Average Coordination Number ◽  
Threshold Behavior ◽  
Rigidity Percolation ◽  
Network Glasses

A Study of the Physical Properties of Te15(Se100-xBix)85 Glassy Alloys

2010 ◽  
Vol 305-306 ◽  
pp. 61-69 ◽  
Author(s):  
Kameshwar Kumar ◽  
Nagesh Thakur ◽  
S.C. Katyal ◽  
Pankaj Sharma
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Coordination Number ◽  
Bond Energy ◽  
Cohesive Energy ◽  
Energy Gap ◽  
Average Coordination Number ◽  
Glassy Alloys ◽  
Mean Bond Energy

In the present communication, a study was made of the compositional variation of physical properties: average coordination number (<r>), average number of constraints (Ncon), number of lone-pair electrons (L), mean bond energy (<E>), cohesive energy (CE), average heat of atomization (Hs), glass transition temperature (Tg), density (ρ) and theoretical energy gap (Eg) for Te15(Se100-xBix)85 (x = 0, 1, 2, 3, 4, 5at%) glassy alloys. The mean bond energy and the cohesive energy have been calculated using the chemical bond approach (CBA). The glass transition temperature was calculated using the Tichy-Ticha approach, and has been found to increase with Bi content. The mean bond energy is found to be proportional to the glass transition temperature and the average coordination number. It has been found that the average coordination number, average number of constraints, mean bond energy and density increase, whereas the cohesive energy, average heat of atomization and theoretical energy gap decrease with increasing Bi content in Se-Te alloys.

Fractional Exponent of the Modified Stokes-Einstein Relation in the Metallic Glass-Forming Melt Pd43Cu27Ni10P20

2010 ◽  
Vol 146-147 ◽  
pp. 1463-1468
Author(s):  
Masahiro Ikeda ◽  
Masaru Aniya
Keyword(s):  
Diffusion Coefficient ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Metallic Glass ◽  
Bond Strength ◽  
Coordination Number ◽  
Einstein Relation ◽  
Glass Forming ◽  
Highly Correlated

The diffusion coefficient in the metallic glass-forming systems such as Pd-Cu-Ni-P exhibits a marked deviation from the Stokes-Einstein (SE) relation in the proximity of the glass transition temperature. Such a deviation is characterized by the fractional exponent p of the modified SE expression. For the material Pd43Cu27Ni10P20, it has been reported that it takes the value p = 0.75. In this work, it is shown that the value of p is highly correlated with the ratio ED / ENB, where ED and ENB are the activation energies for diffusion coefficient D and cooperativity NB defined by the Bond Strength-Coordination Number Fluctuation (BSCNF) model. The present paper reports that for the metallic glass-forming melt Pd43Cu27Ni10P20, the fractional exponent p can be calculated accurately within the framework of the BSCNF model.

Properties and Structure of BaO-ZnO-B2O3 Glasses

2008 ◽  
Vol 368-372 ◽  
pp. 1433-1435 ◽  
Author(s):  
Young Seok Kim ◽  
Young Joon Jung ◽  
Kyu Ho Lee ◽  
Tae Ho Kim ◽  
Bong Ki Ryu
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Coordination Number ◽  
Softening Temperature ◽  
Chemical Durability ◽  
The Other ◽  
Glass Forming ◽  
Other Hand ◽  
Glass Properties

The effect of coordination number on glass properties was investigated by measuring the glass forming region, glass transition temperature, dilatometric softening temperature, density and chemical durability of the glasses. The coordination number of B and Zn in the system 20BaO-xZnO-(80-x) B2O3 glasses (x=0~40mol%) was measured by IR, respectively. No change in the coordination number (CN) of B was revealed, and the coordination of Zn was 4 at ZnO 10mol%, which increased the properties of glasses. On the other hand, the coordination number (CN) of B and Zn changed from CN4 to CN3, CN4 to CN6 over ZnO 20 and 10mol% respectively, which decreased the properties of glasses.

Self-assembly of miscible homopolymer/quasi-block copolymer blends/MWNT composites: a strategy to obtain ultralow electrical percolation threshold and mechanism

RSC Advances ◽  
2015 ◽  
Vol 5 (21) ◽  
pp. 15841-15843
Author(s):  
Ri Xu ◽  
Xuecheng Xu
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Percolation Threshold ◽  
Self Assembly ◽  
Temperature Variations ◽  
Electrical Percolation ◽  
Copolymer Blends ◽  
Miscible Polymer Blends ◽  
Electrical Percolation Threshold

We utilized self-assembly of miscible polymer blends/CNTs composites to obtain ultralow electrical percolation threshold, with different results of both miscibility and glass transition temperature variations from antecedent works.

Effect of Ge and Te on Physical Properties of Cu–Se–In–M (M = Ge, Te) Chalcogenide Glass

2020 ◽  
Vol 12 (1) ◽  
pp. 45-49
Author(s):  
Priyanka Jaiswal ◽  
Vandita Rao ◽  
Pooja Lohia ◽  
D. K. Dwivedi
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Theoretical Analysis ◽  
Structural Characterization ◽  
Chalcogenide Glasses ◽  
Physical Parameters ◽  
Rigidity Percolation ◽  
Amorphous Nature ◽  
Electro Negativity

Cu5Se75In10M10 (M = Ge, Te) bulk chalcogenide glasses have been prepared by melt quench technique. XRD technique has been used for structural characterization. Absence of peaks confirms the amorphous nature of the studied composites. Some important physical parameters have been investigated theoretically i.e., average coordination number, constraints, density, molar volume, cohesive energy, electro negativity, heat of atomization, bond energy etc. Tichy-Ticha and Lankhorst approach has also been used to study the glass transition temperature Tg. Theoretical analysis of composition shows that there is significant change in the structure of the glass due to rigidity percolation.

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