Diffusion Fundamentals (E-Journal)
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A new look towards the determination of parameters of Heine and Abarenkov model potential using only vacancy formation energy in fcc crystals
Get PDFThe Heine and Abarenkov model potential (HAP) parameters (rc, A) have been calculated in this paper for twenty face-centered cubic (fcc) closed pack crystals. From the minimization of the structure dependent energy of the pure crystal the inter-relation between the two parameters of HAP has been initially determined. The calculation uses pseudopotential technique with nine different exchange correlation functions (ECF), either the available experimental value of the vacancy formation energy (EF1v) or that obtained from an empirical relation based on other experimental parameters (melting temperature, cohesive energy or activation energy) as tool. The variation of EF1v with the parameter A of HAP and ECF shows a sharp fall in EF1v near a very small value of A after which it shows constancy for all fcc crystals, and the parameters (rc, A) are determined near the bend. Comparison is made with other calculations and parameters of the Ashcroft model also. For increase in valency the parameter A of HAP increases and shows distinctly different curves
Diffusion as a Means to Determine the Variability of Adsorption Properties on HiSiV3000 Single Pellets
Get PDFTheory for ion diffusion and conduction in glasses based on site energy distributions derived from network former unit concentrations
Get PDFExperimental analysis of self-organizing patterns in crossing flows of pedestrians: Detection of stripes
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Stability of gene expression patterns in developmental systems with dynamic morphogen sources
Get PDFNano-XCT cementitious materials sub-microstructure influence on species transport and corrosion of reinforcement
Get PDFSurface diffusion: defining a new critical effective radius for holes in thin films
Get PDFWe explore a specific small geometry containing a single thin bounded grain on a substrate with a hole at its center. By employing a mathematical model based on surface diffusion, no flux boundary conditions, and prescribed contact angles, we study the evolution of the hole as well as the exterior surface of the grain, based on energetic considerations and dynamic simulations. Our results regarding the formation and evolution of holes in thin films in small geometries shed light on various nonlinear phenomena associated with wetting and dewetting
