scholarly journals Chemical tracer diffusion of Sr and Co in polycrystalline Ca-deficient CaMnO3−δwith CaMn2O4precipitates

2018 ◽  
Vol 20 (4) ◽  
pp. 2754-2760 ◽  
Author(s):  
Temesgen D. Desissa ◽  
Nikola Kanas ◽  
Sathya P. Singh ◽  
Kjell Wiik ◽  
Mari-Ann Einarsrud ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Tracer Diffusion ◽  
Chemical Tracer ◽  
Operational Window ◽  
Boundary Diffusivity

Enhanced grain boundary diffusivity on B-site of perovskite CaMnO3with CaMn2O4precipitates determines operational window of n-type oxide for thermoelectrics.

Diffusion in the Presence of Grain Boundaries: a Variable Length Scale Simulation Method

2001 ◽  
Vol 677 ◽  
Author(s):  
Irina V Belova ◽  
Graeme E Murch
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Numerical Data ◽  
Simulation Method ◽  
Tracer Diffusion ◽  
Boundary Plane ◽  
Length Scale ◽  
Grain Boundary Plane ◽  
Variable Mesh ◽  
Boundary Diffusivity

ABSTRACTIn this paper we introduce a Monte Carlo method for numerical analysis of the problem of tracer diffusion in the presence of isolated grain boundaries with a variable mesh in the direction perpendicular to the grain boundary plane. A number of isoconcentration contour profiles were studied. Two different expressions for the angle between the isoconcentration contours and the grain boundary were derived for the instantaneous tracer source following procedures analogous to Fisher's and Whipple's approximations for the constant tracer source. Comparison with the numerical data was made. Both these approximations overestimate the grain boundary diffusivity.

Estimation of grain boundary diffusivity in near-α titanium polycrystals

2011 ◽  
Vol 65 (6) ◽  
pp. 513-515 ◽  
Author(s):  
Robert A. Brockman ◽  
Adam L. Pilchak ◽  
W. John Porter ◽  
Reji John
Keyword(s):  
Grain Boundary ◽  
Boundary Diffusivity

scholarly journals Cation grain-boundary diffusivity in SiO2 - and MgO-doped Al2 O3

2017 ◽  
Vol 100 (12) ◽  
pp. 5379-5384 ◽  
Author(s):  
Lin Feng ◽  
Shen J. Dillon
Keyword(s):  
Grain Boundary ◽  
Boundary Diffusivity

Estimation of Grain Boundary Diffusivity in Cation-Doped Polycrystalline Alumina

2007 ◽  
pp. 997-1002
Author(s):  
Hidehiro Yoshida ◽  
Koji Morita ◽  
Byung Nam Kim ◽  
Keijiro Hiraga ◽  
Takahisa Yamamoto ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Polycrystalline Alumina ◽  
Boundary Diffusivity

Visualization of Grain Boundary as Blocking Layer for Oxygen Tracer Diffusion and a Proposed Defect Model in Non Doped BaTiO3Ceramics

2011 ◽  
Vol 4 (5) ◽  
pp. 055801 ◽  
Author(s):  
Ken Watanabe ◽  
Isao Sakaguchi ◽  
Shunichi Hishita ◽  
Naoki Ohashi ◽  
Hajime Haneda
Keyword(s):  
Grain Boundary ◽  
Tracer Diffusion ◽  
Blocking Layer ◽  
Defect Model ◽  
Oxygen Tracer

Estimation of Grain Boundary Diffusivity in Near-Alpha Titanium Polycrystals (Preprint)

2011 ◽  
Author(s):  
Adam L. Pilchak ◽  
Reji John ◽  
Robert A. Brockman ◽  
III Porter ◽  
W. J.
Keyword(s):  
Grain Boundary ◽  
Alpha Titanium ◽  
Boundary Diffusivity

A Simulation Study of Tracer Diffusion Concentration Profiles Resulting from the Transition from Dislocation Pipes to a Grain Boundary Slab

2001 ◽  
Vol 677 ◽  
Author(s):  
Irina V Belova ◽  
Graeme E Murch
Keyword(s):  
Grain Boundary ◽  
Diffusion Length ◽  
Grid Method ◽  
Tracer Diffusion ◽  
Concentration Profiles ◽  
Tracer Concentration ◽  
Type Analysis ◽  
Concentration Depth Profile ◽  
Dislocation Pipe ◽  
Lattice Diffusivity

ABSTRACTIn the present study we examine the well-known analysis in which the dislocation pipe diffusivity is determined by means of a grain boundary type analysis of the tail of a tracer concentration depth profile. We use a Monte Carlo grid method for testing the analysis. The results show that the analysis is really only satisfactory when the spacing between the dislocations is roughly twice the diffusion length (Dlt)½ where Dland t are the lattice diffusivity and time respectively.

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