Temperature behavior of the free activation energy of viscous flow of glass-forming melts in a wide temperature range

2012 ◽  
Vol 38 (4) ◽  
pp. 379-385 ◽  
Author(s):  
D. S. Sanditov ◽  
S. B. Munkueva ◽  
A. A. Mashanov ◽  
B. D. Sanditov
Keyword(s):  
Activation Energy ◽  
Viscous Flow ◽  
Wide Temperature Range ◽  
Temperature Behavior ◽  
Temperature Range ◽  
Glass Forming ◽  
Free Activation Energy

Viscosity Measurements for La-Al-Ni liquid Alloys by an Oscillating Crucible Method

1998 ◽  
Vol 554 ◽  
Author(s):  
Tohru Yamasaki ◽  
Tomohiro Tatibana ◽  
Yoshikiyo Ogino ◽  
Akihisa Inoue
Keyword(s):  
Activation Energy ◽  
Viscous Flow ◽  
Melting Temperature ◽  
Glass Forming Ability ◽  
Liquid Alloys ◽  
Temperature Range ◽  
Glass Forming ◽  
Ni Alloys ◽  
Ni Content ◽  
Ni Alloy

AbstractThe viscosity of liquid lanthanum-based and aluminum-based La-Al-Ni alloys has been measured by an oscillating crucible method of the inverse suspending type in the temperature range from melting temperature (Tm) up to about 1400 K. In the case of La55Al45-xNix (x = 10∼40 at. %) alloys, the viscosity increased with increasing Ni content up to about 20 at. % Ni and then decreased with increasing the Ni content, while the activation energy for viscous flow decreased to a minimum value at about 20 at. % Ni. This composition is well consistent with that of the La-Al-Ni alloy having largest glass-forming ability.

scholarly journals A comparison of the activation energy of viscous flow for hen egg-white lysozyme obtained on the basis of different models of viscosity for glass-forming liquids

2011 ◽  
Vol 34 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Karol Monkos
Keyword(s):  
Activation Energy ◽  
Viscous Flow ◽  
Egg White ◽  
Hen Egg White Lysozyme ◽  
Glass Forming ◽  
Egg White Lysozyme ◽  
Wide Range ◽  
Different Temperatures ◽  
Hen Egg White ◽  
Hen Egg

A comparison of the activation energy of viscous flow for hen egg-white lysozyme obtained on the basis of different models of viscosity for glass-forming liquids The paper presents the results of viscosity determinations on aqueous solutions of hen egg-white lysozyme at a wide range of concentrations and at temperatures ranging from 5°C to 55°C. On the basis of these measurements and different models of viscosity for glass-forming liquids, the activation energy of viscous flow for solutions and the studied protein, at different temperatures, was calculated. The analysis of the results obtained shows that the activation energy monotonically decreases with increasing temperature both for solutions and the studied protein. The numerical values of the activation energy for lysozyme, calculated on the basis of discussed models, are very similar in the range of temperatures from 5°C to 35°C.

Nonmetal-Metal Transition in Liquid Cu-Based Alloys

2001 ◽  
Vol 215 (1) ◽  
Author(s):  
V. Sklyarchuk ◽  
Y. Plevachuk
Keyword(s):  
Activation Energy ◽  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Wide Temperature Range ◽  
Electron Spectrum ◽  
Density Fluctuations ◽  
Wave Functions ◽  
Free Electrons ◽  
Temperature Range

AbstractElectrical conductivity σ(T) and thermo-e.m.f. S(T) measurements were performed for ternary Cu-based chalcogenides in a wide temperature range. A concentration range of the semiconductor-metal transition has been determined. A radical alteration in the electron spectrum occurs in the region of x = 0.6-0.8, namely, a semiconductor-metal transition takes place. Complete metallization of alloys takes place with temperature increasing. Further heating is accompanied by electrical conductivity decreasing followed by final exponential electrical conductivity dependence with seeming negative activation energy, while thermopower increases without changing a sign. This process is accompanied by an increase of a free electrons concentration. At the same time, at higher temperatures when the alloy’s density decreases, localization of the wave functions of electrons on separated atoms or atoms groups caused by density fluctuations, occurs. For alloys with Se content, the electrical conductivity decreasing caused by thermal expansion, could be intensified at the expense of molecular units formation. A simultaneous density decreasing causes an appearance of small dynamic groups like Se

Electrical Conductivity of Molten CdCl2 at Temperatures as High as 1474 K

2016 ◽  
Vol 71 (7) ◽  
pp. 673-675 ◽  
Author(s):  
Alexander B. Salyulev ◽  
Alexei M. Potapov
Keyword(s):  
Activation Energy ◽  
Electrical Conductivity ◽  
Wide Temperature Range ◽  
Boiling Point ◽  
Maximum Temperature ◽  
Normal Boiling Point ◽  
Temperature Range

AbstractThe electrical conductivity of molten CdCl2 was measured across a wide temperature range (ΔT=628 K), from 846 K to as high as 1474 K, i.e. 241° above the normal boiling point of the salt. In previous studies, a maximum temperature of 1201 K was reached, this being 273° lower than in the present work. The activation energy of electrical conductivity was calculated.

INTERMOLECULAR FORCES AND LIQUID STRUCTURE IN SOME METAL ALKOXIDES

1961 ◽  
Vol 39 (8) ◽  
pp. 1619-1624 ◽  
Author(s):  
D. C. Bradley ◽  
Calliope C. A. Prevedorou ◽  
W. Wardlaw
Keyword(s):  
Activation Energy ◽  
Free Energy ◽  
Viscous Flow ◽  
Liquid Structure ◽  
Intermolecular Forces ◽  
Metal Alkoxides ◽  
Temperature Range ◽  
Entropy Of Activation ◽  
Titanium Zirconium

The viscosities of some alkoxides of titanium, zirconium, cerium (IV), thorium, and tin (IV) have been measured in the temperature range 25–40 °C. The liquid structure in these compounds is discussed in terms of the activation energy, free energy, and entropy of activation for viscous flow, and the energies of cohesion and vaporization.

Fibre-optic temperature sensor with wide temperature range characteristics

1987 ◽  
Vol 134 (5) ◽  
pp. 291 ◽  
Author(s):  
K.T.V. Grattan ◽  
J.D. Manwell ◽  
S.M.L. Sim ◽  
C.A. Willson
Keyword(s):  
Wide Temperature Range ◽  
Temperature Sensor ◽  
Fibre Optic ◽  
Temperature Range
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