Oxygen interstitials reduce hydrogen diffusivity in hcp-zirconium by lowering hopping rates and creating hydrogen traps, with the effect growing as oxygen concentration increases.
In the first system H occupying each interstitial site is only affected by one O atom
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Effect of Oxygen on Hydrogen Diffusivity in hcp-Zirconium
Oxygen interstitials reduce hydrogen diffusivity in hcp-zirconium by lowering hopping rates and creating hydrogen traps, with the effect growing as oxygen concentration increases.