Comment on "Effect of Surface Condition on Oxygen Self-Diffusion Coefficients in Single-Crystal Al2O3" and "Effect of Ratio of Surface Area to Volume on Oxygen Self-Diffusion Coefficients Determined for Crushed MgO-Al2O3Spinels"

1984 ◽  
Vol 67 (12) ◽  
pp. C-269-C-271 ◽  
Author(s):  
Paul F. Dennis ◽  
John A. Kilner
Keyword(s):  
Single Crystal ◽  
Surface Area ◽  
Diffusion Coefficients ◽  
Surface Condition ◽  
Self Diffusion ◽  
Effect Of Surface

Effect of Surface Condition on Oxygen Self-Diffusion Coefficients for Single-Crystal Al2O3

1983 ◽  
Vol 66 (8) ◽  
pp. C-130-C-131 ◽  
Author(s):  
Yasumichi Oishi ◽  
Ken Ando ◽  
Nobuhiko Suga ◽  
W. David Kingery
Keyword(s):  
Single Crystal ◽  
Diffusion Coefficients ◽  
Surface Condition ◽  
Self Diffusion ◽  
Effect Of Surface

Interphase Boundary Diffusion in Eutectic Alloys

1985 ◽  
Vol 57 ◽  
Author(s):  
G. A. Chadwick
Keyword(s):  
Diffusion Coefficient ◽  
Single Crystal ◽  
Single Crystals ◽  
Interphase Boundary ◽  
Diffusion Coefficients ◽  
Noble Metals ◽  
Boundary Diffusion ◽  
Eutectic Alloys ◽  
Self Diffusion ◽  
Interphase Boundaries

AbstractTurnbull and co-workers have shown that the noble metals Cu, Ag, and Au diffuse into single crystals of Pb and Sn by an interstitialcy mechanism with measured diffusion coefficients of ∼10−6cm2s−1. These experiments have been extended to study the diffusion rates of the noble metals along the interphase boundaries of single crystal of Pb-Sn eutectic alloys and to measure the diffusion coefficient of silver along the interphase boundaries of Ag-Cu eutectic single crystals.The measured interphase boundary diffusion coefficients of the noble metals in the Pb-Sn single crystals are extremely high, being 2.6 × 10−3cm2s−1for Cu and ∼10−4cm2s−1for Ag and Au at room temperature. These results again imply an interstitialcy mechanism of diffusion at the interphase boundaries. In contrast, the diffusion coefficient of Ag110in a Ag-Cu eutectic single crystal worked out to be ∼8×10−9cm2s−1at 500°C, two orders of magnitude lower than the value obtained by Turnbull and Hoffman for self-diffusion along low-angle (8∼10°) boundaries in silver.

Anisotropic Diffusion Behaviour of Al and Zn in HCP Mg: Diffusion Couple Experiment Using Mg Single Crystal

2013 ◽  
Vol 765 ◽  
pp. 516-520 ◽  
Author(s):  
Sazol Kumar Das ◽  
Young Min Kim ◽  
Tae Kwon Ha ◽  
Raynald Gauvin ◽  
In Ho Jung
Keyword(s):  
Diffusion Couple ◽  
Single Crystal ◽  
Diffusion Coefficients ◽  
Basal Plane ◽  
Anisotropic Diffusion ◽  
Self Diffusion ◽  
Multiphase Diffusion ◽  
Diffusion Couple Experiment ◽  
Couple Experiment ◽  
Diffusion Behaviour

Diffusion couple experiments for Mg-Al and Mg-Zn were carried out with Mg single crystal to determine the anisotropic diffusion coefficients of Al and Zn in hcp Mg at the temperature range between 553 and 693 K. Based on the experimental results, anisotropic diffusion coefficients of Al and Zn were calculated using multiphase diffusion simulations. Al diffusion in hcp Mg is slightly faster than Mg self-diffusion itself, but the diffusion of Zn is slightly slower than Mg self-diffusion. The diffusion coefficients of Al and Zn along the a-axis (basal plane) of hcp Mg is slightly higher (1.1-1.4 times) than those along the c-axis (normal to the basal plane), which is also similar to Mg self-diffusion behaviour.

SELF-DIFFUSION COEFFICIENTS OF Tl AND Br IN TIBr SINGLE CRYSTAL

1972 ◽  
Vol 1 (9) ◽  
pp. 831-834 ◽  
Author(s):  
Seiichi Khrihara ◽  
Kazuo Fueki ◽  
Takashi Mukaibo
Keyword(s):  
Single Crystal ◽  
Diffusion Coefficients ◽  
Self Diffusion

Measurement of growth rates for single crystals and pressed tablets of CuSO4.5 H2O on a rotating disc

1989 ◽  
Vol 54 (11) ◽  
pp. 2951-2961 ◽  
Author(s):  
Miloslav Karel ◽  
Jaroslav Nývlt
Keyword(s):  
Growth Rate ◽  
Single Crystal ◽  
Single Crystals ◽  
Growth Rates ◽  
Diffusion Coefficients ◽  
Preferred Orientation ◽  
Rotating Disc ◽  
Dissolution Rates ◽  
Rates Of Growth ◽  
Good Agreement

Measured growth and dissolution rates of single crystals and tablets were used to calculate the overall linear rates of growth and dissolution of CuSO4.5 H2O crystals. The growth rate for the tablet is by 20% higher than that calculated for the single crystal. It has been concluded that this difference is due to a preferred orientation of crystal faces on the tablet surface. Calculated diffusion coefficients and thicknesses of the diffusion and hydrodynamic layers in the vicinity of the growing or dissolving crystal are in good agreement with published values.

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