Hydrogen solubility and diffusivity at Σ3 grain boundary of PdCu

First principles calculations have been performed to comparatively reveal hydrogen solubility and diffusivity at grain boundaries of BCC and FCC PdCu phases. It is found that the temperature-dependent hydrogen solubility at BCC Σ3 (112) GB of PdCu seems much higher than that in BCC PdCu bulk, while...

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Bibliographic Details
Published in:RSC advances 2021-04, Vol.11 (22), p.13644-13652
Main Authors: Liu, L. C, Gong, H. R
Format: Article
Language:English
Subjects:
Body centered cubic lattice
Chemistry
Diffusion effects
Diffusivity
Face centered cubic lattice
First principles
Grain boundaries
Hydrogen
Mathematical analysis
Solubility
Temperature dependence
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Summary:First principles calculations have been performed to comparatively reveal hydrogen solubility and diffusivity at grain boundaries of BCC and FCC PdCu phases. It is found that the temperature-dependent hydrogen solubility at BCC Σ3 (112) GB of PdCu seems much higher than that in BCC PdCu bulk, while hydrogen solubility in FCC Σ3 (111) GB of PdCu is much lower than that in its corresponding FCC bulk. Calculations also reveal that grain boundary has an important effect on hydrogen diffusion of BCC and FCC PdCu, i.e. , hydrogen diffusivities of BCC Σ3 (112) and FCC Σ3 (111) grain boundaries of PdCu seem much smaller and bigger than those of its corresponding bulks, respectively. The predicted results could deepen the comprehension of hydrogen solubility and diffusion of PdCu phases. The atom structure of BCC PdCu Σ3 (112) GB, and hydrogen diffusion through BCC PdCu Σ3 (112) GB.
ISSN:2046-2069
2046-2069
DOI:10.1039/d0ra10133h