Abstract
Stainless steel (SUS) is used as the structure material in nuclear fusion devices. Heating and O2 plasma discharge are considered for the removal of tritium. Oxide layer growth is anticipated on heating SUS at a high temperature in low-pressure residual O2 gas. When O2 plasma discharge is performed, oxygen plasma reaches the structure material and iron oxides such as Fe2O3 are formed. Thus, a knowledge of the retention behavior of hydrogen isotopes or deuterium (D) in the oxide layers is important in designing the devices. We investigated D retention in Fe2O3 films and the influence of Fe2O3 crystal structure on D retention and found that D retention in γ-Fe2O3 (cubic-maghemite) is larger than that in α-Fe2O3 (hexagonal-hematite). The results for Fe2O3 are compared with those for SUS and Fe.
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