Temperature Dependence of Gas and Vapor Diffusion Coefficients.

1963 ◽  
Vol 8 (2) ◽  
pp. 168-169 ◽  
Author(s):  
Spencer L. Seager ◽  
Lyle R. Geertson ◽  
J. Calvin Giddings
Keyword(s):  
Temperature Dependence ◽  
Diffusion Coefficients ◽  
Vapor Diffusion

Silver Self-Diffusion in Al2O3/QE22 Magnesium Alloy Matrix Composite

2009 ◽  
Vol 283-286 ◽  
pp. 155-160
Author(s):  
Ivo Stloukal ◽  
Jiří Čermák
Keyword(s):  
Magnesium Alloy ◽  
Temperature Dependence ◽  
Temperature Interval ◽  
Matrix Composite ◽  
Diffusion Coefficients ◽  
Volume Diffusion ◽  
Effective Diffusion ◽  
Measured Temperature ◽  
Alloy Matrix ◽  
Self Diffusion

Self-diffusion of 110mAg has been investigated in fiber reinforced QE22 magnesium alloy matrix composite. Short Saffil fibers (97% -Al2O3 + 3% SiO2) were used as reinforcement. The diffusion measurements were carried out in the temperature interval 648 – 728 K by serial sectioning method. The volume diffusion coefficients Dv (alloy without reinforcement) and the effective diffusion coefficients Deff (alloy with reinforcement) were obtained by analysis of the penetration curves. The silver diffusion coefficient in the interface boundary matrix/Saffil Di was also estimated. The temperature dependence of volume diffusion coefficients Dv was compared with previous data measured using 65Zn in the same alloy and with literature data for Zn impurity diffusion in Mg single crystal. It was observed, that the temperature dependence of both Deff and Di was significantly non-linear in the measured temperature interval. This behavior supports previous observations with zinc diffusion in the same alloy.

Tracer Impurity Diffusion in Liquid Metals: Zn and Cd in Gallium

1974 ◽  
Vol 29 (6) ◽  
pp. 957-958
Author(s):  
S. J. Larsson ◽  
P.-E. Eriksson
Keyword(s):  
Temperature Dependence ◽  
Diffusion Coefficients ◽  
Liquid Metals ◽  
Impurity Diffusion ◽  
Linear Plot

The diffusion coefficients of 65Zn and 115Cd in liquid Ga have been measured between 27° and 455 °C. The temperature dependence of D can be represented by a linear plot or by an Arrhenius representation with D0=2.1·10-4 cm2/s, Q=1.60 kcal/mol for Zn, and D0=2.3·10-4 cm2/s, Q=1.77 kcal/mol for Cd. An extrapolation to lower temperatures for Zn in Ga connects to the measurements by Belskii et al. The present results imply that for impurity diffusion in liquid Ga the effects of solute mass are more significant than valence effects.

Temperature Dependence of the Diffusion of 1,2-Dichloroethane, 1,1,1-Trichloroethane, Trichloroethylene, and Tetrachloroethylene in Air

1971 ◽  
Vol 49 (11) ◽  
pp. 1965-1967 ◽  
Author(s):  
Harry Watts
Keyword(s):  
Temperature Dependence ◽  
Diffusion Coefficients ◽  
Room Temperature ◽  
Evaporation Method ◽  
Temperature Range ◽  
Boiling Points ◽  
Rate Of Evaporation

The diffusion coefficients in air of 1,1-dichloroethane, 1,1,1-trichloroethane, trichloroethylene, and tetrachloroethylene have been measured over a temperature range from room temperature to close to their boiling points by a rate of evaporation method.

Sign in / Sign up

Export Citation Format

Share Document