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Oxidation mechanism of porous Zr₂Fe used as a hydrogen getter
Dror Cohen1, Moshe Nahmani2, Genadi Rafailov2
1Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel; Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel.
Abstract:
We determined the oxidation mechanism of porous ST-198, which mainly comprises Zr2Fe. Oxidation kinetics depended on temperature, oxygen partial pressure, and oxidation extent. The passivation role of oxidation in hydrogen scavenging is probably due to the development of a surface oxide, independent of oxygen concentration. Zr2Fe would be a superior hydrogen getter in oxygen-contaminated environments at high temperatures, as most oxygen will be consumed at the outer shell by mass transfer limitations, protecting the bulk of the getter for hydrogen scavenging.
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