Lattice Diffusion Creep Mechanism not Based on Vacancy Concentration Gradient
نویسندگان
چکیده
منابع مشابه
The Vacancy Concentration and Diffusion in Rare Gas Solids H
Using the two-body Mie, Lennard-Jones potentials derived from solid state properties, the vacancy concentration p. and self-diffusion coefficient D are calculated for the rare gas solids. The results are summarised in Tables l-3. Agreement is obtained with the observed D but not with p.. If the usual interpretation is applied, the agreement of I) suggests the absence of many-body forces whereas...
متن کاملFormation Mechanism of Plateau, Rapid Fall and Tail in Phosphorus Diffusion Profile in Silicon Based on the Pair Diffusion Models of Vacancy Mechanism and Interstitial Mechanism
Experimental P diffusion profile in Si with a constant P surface concentration of 3 ×10 cm −3 at 900°C under an inert atmosphere is shown in Fig. 1. The abscissa is x / t = λ , where x is the distance from a specimen surface and t is the diffusion time. The profile has the plateau, rapid fall and tail. Yoshida et al. studied P diffusion in Si based on the pair diffusion models of the vacancy me...
متن کاملEfficient gradient calibration based on diffusion MRI
PURPOSE To propose a method for calibrating gradient systems and correcting gradient nonlinearities based on diffusion MRI measurements. METHODS The gradient scaling in x, y, and z were first offset by up to 5% from precalibrated values to simulate a poorly calibrated system. Diffusion MRI data were acquired in a phantom filled with cyclooctane, and corrections for gradient scaling errors and...
متن کاملNitrogen diffusion mechanism in the R2Fe17 lattice
In this report, a diffusion analysis has been extended to a lattice containing two interstitial sites, and the results obtained are used to understand: ~1! the formation of a nitrided/unnitrided N configuration for intermediate N content and ~2! the abnormally small ~apparent! diffusion frequency factor, both of which characterize the newly developed R2Fe17 nitrides. It turns out that the diffu...
متن کاملLattice Fokker-Planck Method Based on Wasserstein Gradient Flows
Abstract A lattice Fokker-Planck method is introduced based upon a variational formulation of the time evolution as a Wasserstein gradient flow within the space of probability densities of the system. Gradient descent directions are efficiently generated by exploiting the link to Langevin dynamics and the parallel-execution capabilities of graphics processing units. This approach can capture al...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of the Japan Institute of Metals and Materials
سال: 1998
ISSN: 0021-4876,1880-6880
DOI: 10.2320/jinstmet1952.62.12_1206