Strain-Gradient Influence on Hydrogen Diffusion Coefficients in Pd81Pt19 System

1996 ◽  
Vol 129-130 ◽  
pp. 303-304 ◽  
Author(s):  
D. Dudek ◽  
B. Baranowski
Keyword(s):  
Strain Gradient ◽  
Diffusion Coefficients ◽  
Hydrogen Diffusion

Determination of Hydrogen Diffusion Coefficients in F82H by Hydrogen Depth Profiling with a Tritium Imaging Plate Technique

2015 ◽  
Vol 67 (2) ◽  
pp. 379-381 ◽  
Author(s):  
M. Higaki ◽  
T. Otsuka ◽  
K. Tokunaga ◽  
K. Hashizume ◽  
K. Ezato ◽  
...  
Keyword(s):  
Diffusion Coefficients ◽  
Hydrogen Diffusion ◽  
Depth Profiling ◽  
Imaging Plate ◽  
Plate Technique

Machine learning assisted design of FeCoNiCrMn high-entropy alloys with ultra-low hydrogen diffusion coefficients

2021 ◽  
pp. 117535
Author(s):  
Xiao-Ye Zhou ◽  
Ji-Hua Zhu ◽  
Yuan Wu ◽  
Xu-Sheng Yang ◽  
Turab Lookman ◽  
...  
Keyword(s):  
Machine Learning ◽  
Diffusion Coefficients ◽  
Hydrogen Diffusion ◽  
High Entropy Alloys ◽  
High Entropy

Hydrogen Diffusion Coefficient during Hydrogen Permeation through Nb-Based Hydrogen Permeable Membranes

2009 ◽  
Vol 283-286 ◽  
pp. 225-230 ◽  
Author(s):  
Hiroshi Yukawa ◽  
G.X. Zhang ◽  
N. Watanabe ◽  
Masahiko Morinaga ◽  
T. Nambu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Diffusion Coefficient ◽  
High Temperature ◽  
Solid Solutions ◽  
Diffusion Coefficients ◽  
Hydrogen Diffusion ◽  
Hydrogen Permeation ◽  
Pure Niobium ◽  
Hydrogen Diffusion Coefficient

The hydrogen diffusion coefficients are investigated during the hydrogen permeation through Nb-based hydrogen permeable membranes at high temperature. It is found that the hydrogen diffusion coefficient for pure niobium under practical conditions is much lower than the reported values measured for dilute hydrogen solid solutions. Surprisingly, the hydrogen diffusion is found to be faster in Pd-Ag alloy with fcc crystal structure than in pure niobium with bcc crystal structure at 773K during the hydrogen permeation. It is also found that the addition of Ru or W into niobium increases the hydrogen diffusion coefficient under the practical conditions.

Hydrogen Diffusion in Chalcopyrite Solar Cell Materials

1998 ◽  
Vol 513 ◽  
Author(s):  
A. Weidinger ◽  
J. Krauser ◽  
Th. Riedle ◽  
R. Klenk ◽  
M. Ch. Lux-Steiner ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cell ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Diffusion Coefficients ◽  
Transport Process ◽  
Hydrogen Diffusion ◽  
Intrinsic Diffusion ◽  
Ion Energy ◽  
Temperature Range

ABSTRACTHydrogen diffusion in CuInSe 2 single crystals and CuInS2 thin films was studied by measuring the spreading of implantation profiles upon annealing. Deep implantation with an ion energy of 10 keV and sub-surface implantation with 300 eV were applied. The diffusion coefficients in both materials were found to be in the order of 10-14 to 10-13 cm2/s in the temperature range between 400 and 520 K.These fairly low diffusivities are typical for a trap and release transport process rather than intrinsic diffusion of interstitial hydrogen. In the polycrystalline CuInS2 films, hydrogen leaves the sample through the grain boundaries.

scholarly journals Molecular-Dynamics Simulation of Self-Diffusion of Molecular Hydrogen in X-Type Zeolite

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaoming Du
Keyword(s):  
Molecular Dynamics ◽  
Diffusion Coefficients ◽  
Hydrogen Diffusion ◽  
Mean Free Path ◽  
The Self ◽  
Dynamics Simulation ◽  
Pulse Field ◽  
Self Diffusion ◽  
Hydrogen Molecules ◽  
Dynamics Simulations

The self-diffusion of hydrogen in NaX zeolite has been studied by molecular-dynamics simulations for various temperatures and pressures. The results indicate that in the temperature range of 77–293 K and the pressure range of 10–2700 kPa, the self-diffusion coefficients are found to range from 1.61 × 10−9 m2·s−1to 3.66 × 10−8 m2·s−1which are in good agreement with the experimental values from the quasielastic neutron scattering (QENS) and pulse field gradients nuclear magnetic resonance (PFG NMR) measurements. The self-diffusion coefficients decrease with increasing pressure due to packing of sorbate-sorbate molecules which causes frequent collusion among hydrogen molecules in pores and increase with increasing temperature because increasing the kinetic energy of the gas molecules enlarges the mean free path of gas molecule. The activated energy for hydrogen diffusion determined from the simulation is pressure-dependent.

Kinetic Monte Carlo Simulation of Hydrogen Diffusion in Tungsten

2016 ◽  
Author(s):  
Xue Yang ◽  
Wasiu O. Oyeniyi
Keyword(s):  
Monte Carlo ◽  
Hydrogen Concentration ◽  
Diffusion Coefficients ◽  
Hydrogen Diffusion ◽  
Kinetic Monte Carlo ◽  
Bcc Lattice ◽  
Tetrahedral Sites ◽  
Calculation Results ◽  
Diffusion Paths ◽  
Lattice Surface

This research developed a Kinetic Monte Carlo (KMC) method for simulating hydrogen diffusion in tungsten bulk. The KMC inputs such as diffusion paths and energy barriers are taken from DFT calculation results from the literatures. In this simulation model, stable hydrogen interstitial sites in tungsten are the tetrahedral sites on each surface of the bcc lattice, and each site has four tetrahedral neighboring sites, with two neighbors on the same lattice surface and the other two on the adjacent two perpendicular surfaces. A MATLAB script has been developed to perform the diffusion modeling for any given hydrogen concentration and substrate temperature. To compare the simulation results with experiment measurements, modeling configuration of low hydrogen concentration and temperature of 300 K to 2500 K mirroring the experiment conditions was used. The calculated diffusion coefficients at various temperatures match the experiment reference very well. The calculated diffusion coefficients are also fitted to the Arrhenius equation as: D [m2/s] = 5.59×10−7 exp(−0.426/kBT)

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