Inequality linking vacancy-formation energy and rigidity in a liquid at melting point from a density-independent pair potential theory

1989 ◽  
Vol 40 (5) ◽  
pp. 3356-3357 ◽  
Author(s):  
N. H. March
Keyword(s):  
Melting Point ◽  
Potential Theory ◽  
Formation Energy ◽  
Pair Potential ◽  
Vacancy Formation Energy ◽  
Vacancy Formation ◽  
Independent Pair

Vacancy formation energy in K2O

2018 ◽  
Author(s):  
V. P. Saleel Ahammad Saleel ◽  
R. D. Eithiraj
Keyword(s):  
Formation Energy ◽  
Vacancy Formation Energy ◽  
Vacancy Formation

Vacancy Formation Energy and Kinetic Properties of Liquid Metals

2021 ◽  
Vol 880 ◽  
pp. 43-48
Author(s):  
Yuri N. Starodubtsev ◽  
V.S. Tsepelev
Keyword(s):  
Diffusion Coefficient ◽  
Kinematic Viscosity ◽  
Formation Energy ◽  
Liquid Metals ◽  
Linear Regression Analysis ◽  
Vacancy Formation Energy ◽  
Vacancy Formation ◽  
Kinetic Properties ◽  
Self Diffusion ◽  
Self Diffusion Coefficient

We investigated the relationship of the vacancy formation energy with kinematic viscosity and self-diffusion coefficient in liquid metals at the melting temperature. Formulas are obtained that relate experimental values of the vacancy formation energy, kinematic viscosity, and self-diffusion coefficient to the atomic size and mass, the melting and Debye temperatures. The viscosity and self-diffusion parameters are introduced. The ratio of these parameters to vacancy formation energy is equal to dimensionless constants. It is shown that the formulas for viscosity and self-diffusion differ only in dimensionless constants; the values of these constants are calculated. Linear regression analysis was carried out and formulas with the highest adjusted coefficient of determination were identified. The calculated values of the self-diffusion coefficient for a large number of liquid metals are presented.

scholarly journals Vacancies in Pure Ice Studied by Positron Annihilation Techniques

1978 ◽  
Vol 21 (85) ◽  
pp. 85-99 ◽  
Author(s):  
O. E. Mogensen ◽  
M. Eldrup
Keyword(s):  
Hydrogen Bond ◽  
Melting Point ◽  
Positron Annihilation ◽  
Formation Energy ◽  
Vacancy Concentration ◽  
Electric Properties ◽  
Vacancy Formation Energy ◽  
Water Molecules ◽  
Pronounced Change ◽  
Electron States

Abstract Positron annihilation techniques (PAT) are briefly discussed, and the information that may be obtained about the positronium (Ps) states is compared to that obtainable about the similar electron states. The behaviour of Ps in monocrystals of pure light and heavy ice was studied at temperatures between — 185°C and the melting point. Ps is very probably trapped in vacancies (i.e. missing water molecules) in ice. A vacancy formation energy of roughly 0.2–0.35 eV was derived in agreement with the value 0.28±0.07 eV obtained previously from studies of the annealing of irradiated ice. The vacancy concentration is at least a few parts per million at the melting point, i.e. roughly 104 times higher than normally assumed in the literature. The fact that the vacancy concentration is comparable to that of the hydrogen-bond defects will probably enforce a pronounced change in the “hydrogen-bond-defects” theory of the electric properties of ice.

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