Relation of Self-Diffusion Activation Energy to the Debye Temperature in Molecular and Noble Gas Solids

1971 ◽  
Vol 43 (1) ◽  
pp. K59-K61 ◽  
Author(s):  
B. N. Oshcherin
Keyword(s):  
Activation Energy ◽  
Debye Temperature ◽  
Noble Gas ◽  
Diffusion Activation Energy ◽  
Self Diffusion ◽  
Diffusion Activation

Effect of alloying on the self-diffusion activation energy in γ-iron

2011 ◽  
Vol 53 (11) ◽  
pp. 2194-2200 ◽  
Author(s):  
A. A. Vasilyev ◽  
S. F. Sokolov ◽  
N. G. Kolbasnikov ◽  
D. F. Sokolov
Keyword(s):  
Activation Energy ◽  
The Self ◽  
Diffusion Activation Energy ◽  
Self Diffusion ◽  
Diffusion Activation ◽  
Effect Of Alloying

scholarly journals Thermally stimulated oxygen desorption in Sr2FeMoO6-δ

2018 ◽  
Vol 4 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Nikolay A. Kalanda
Keyword(s):  
Activation Energy ◽  
Oxygen Diffusion ◽  
Gas Flow ◽  
Oxygen Vacancies ◽  
Early Stage ◽  
Diffusion Activation Energy ◽  
Energy Calculation ◽  
Heating Rates ◽  
Oxygen Desorption ◽  
Diffusion Activation

Polycrystalline Sr2FeMoO6-δ specimens have been obtained by solid state synthesis from partially reduced SrFeO2,52 and SrMoO4 precursors. It has been shown that during oxygen desorption from the Sr2FeMoO6-δ compound in polythermal mode in a 5%H2/Ar gas flow at different heating rates, the oxygen index 6-δ depends on the heating rate and does not achieve saturation at T = 1420 K. Oxygen diffusion activation energy calculation using the Merzhanov method has shown that at an early stage of oxygen desorption from the Sr2FeMoO6-δ compound the oxygen diffusion activation energy is the lowest Еа = 76.7 kJ/mole at δ = 0.005. With an increase in the concentration of oxygen vacancies, the oxygen diffusion activation energy grows to Еа = 156.3 kJ/mole at δ = 0.06. It has been found that the dδ/dt = f (Т) and dδ/dt = f (δ) functions have a typical break which allows one to divide oxygen desorption in two process stages. It is hypothesized that an increase in the concentration of oxygen vacancies Vo•• leads to their mutual interaction followed by ordering in the Fe/Mo-01 crystallographic planes with the formation of various types of associations.

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