scholarly journals Density functional calculation of activation energies for lattice and grain boundary diffusion in alumina

2013 ◽  
Vol 87 (21) ◽  
Author(s):  
Yinkai Lei ◽  
Yu Gong ◽  
Zhiyao Duan ◽  
Guofeng Wang
Keyword(s):  
Grain Boundary ◽  
Density Functional ◽  
Boundary Diffusion ◽  
Activation Energies ◽  
Grain Boundary Diffusion ◽  
Density Functional Calculation

Oxygen Self-Diffusion In Mgo Grain Boundaries

1994 ◽  
Vol 357 ◽  
Author(s):  
Michael Liberatore ◽  
Bernhardt J. Wuensch
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Experimental Error ◽  
Boundary Diffusion ◽  
High Energy ◽  
Activation Energies ◽  
Grain Boundary Diffusion ◽  
Low Energy ◽  
Enhanced Diffusion ◽  
Self Diffusion

AbstractOxygen grain boundary diffusion has been studied in low energy (∑5, ∑13) and high energy (asymmetric 16° tilt) MgO grain boundaries. Enhanced diffusion of oxygen was observed in all boundaries, but more so in the general, high energy boundary, by 1 - 2 orders of magnitude. This supports the theory that the better the atomic registry between the adjoining grains the lower the diffusivities in the grain boundary. Also the activation energies for bulk and grain boundary diffusion (in the ∑13 boundaries) were found to be equal to within experimental error. (≈ 3.9eV)

Sintering Behavior of Ba2CaWO6-Doped-Tungsten

1993 ◽  
Vol 322 ◽  
Author(s):  
J.A. Ruud ◽  
B.P. Bewlay
Keyword(s):  
Grain Boundary ◽  
Mass Loss ◽  
Boundary Diffusion ◽  
Activation Energies ◽  
Grain Boundary Diffusion ◽  
Sintering Behavior ◽  
Densification Mechanism ◽  
Early Stages ◽  
Kinetics Of

AbstractThe sintering behavior of Ba2CaWO6 co-sintered with W powder was investigated. Measurements of density and mass loss of sintered compacts showed that the Ba2CaWO6-doped-W had a lower density than undoped W and that there was little volatilization of Ba2CaWO6 at temperatures below 1750 °C. The activation energies for densification of Ba2CaWO6-doped-W and undoped W were both measured to be 389 kJ/mol, which indicates the same densification mechanism, grain boundary diffusion, operated for both materials. The reduced densification kinetics of the Ba2CaWO6-doped-W was probably due to increased coarsening in the early stages of sintering.

GRAIN BOUNDARY DIFFUSION OF BULK INTERSTITIALS IN ALPHA-ZIRCONIUM

1990 ◽  
Vol 51 (C1) ◽  
pp. C1-691-C1-696 ◽  
Author(s):  
K. VIEREGGE ◽  
R. WILLECKE ◽  
Chr. HERZIG
Keyword(s):  
Grain Boundary ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion

Room-temperature grain boundary diffusion data measured from historical artifacts

2005 ◽  
Vol 96 (10) ◽  
pp. 1187-1192 ◽  
Author(s):  
Raymond J. Kremer ◽  
Mysore A. Dayananda ◽  
Alexander H. King
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
Diffusion Data

Determination of grain-boundary diffusion of Ag in nanocrystalline Cu by the Hwang–Balluffi method

2001 ◽  
Vol 89 (7) ◽  
pp. 3971-3975 ◽  
Author(s):  
Z. Erdélyi ◽  
Ch. Girardeaux ◽  
G. A. Langer ◽  
D. L. Beke ◽  
A. Rolland ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion
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