Abstract Hydrogen release behavior from rare earth oxides (REOs) (Y2O3, Sm2O3, Eu2O3, Gd2O3, Dy2O3, Er2O3, and Yb2O3) exposed to 133 Pa of deuterium (D2) gas or 2 kPa of heavy water (D2O) vapor at 873 K for 5 h was examined using thermal desorption spectroscopy. Hydrogen solubility and diffusivity in Y2O3, Gd2O3, Dy2O3, Er2O3, and Yb2O3 exposed to a deuterium-tritium gas mixture (5% to 7% T, 133 Pa) at 873 K and 973 K for 5 h were determined using a tritium imaging plate method. The structural and morphological properties of sintered disk specimens of those REOs were evaluated using an X-ray diffractometer and a scanning electron microscope. From the obtained results, the REO materials were clearly categorized into two kinds in terms of their crystal structure and hydrogen solubility: Monoclinic specimens of Sm2O3, Eu2O3, and Gd2O3 had relatively high hydrogen solubility and diffusivity, while cubic Y2O3, Dy2O3, Er2O3, and Yb2O3 had lower ones. The present study suggests that the cubic REOs could be suitable in a nuclear fusion reactor as the tritium barrier materials.

中文翻译：

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稀土氧化物的氢同位素溶解与释放行为

摘要 稀土氧化物 (REO)（Y2O3、Sm2O3、Eu2O3、Gd2O3、Dy2O3、Er2O3 和 Yb2O3）在 873 K 时暴露于 133 Pa 的氘 (D2) 气体或 2 kPa 的重水 (D2O) 蒸汽中的氢释放行为使用热解吸光谱检查 5 小时。氢在 Y2O3、Gd2O3、Dy2O3、Er2O3 和 Yb2O3 中的溶解度和扩散率在 873 K 和 973 K 的氘-氚气体混合物（5% 至 7% T，133 Pa）中使用氚成像板测定 5 小时方法。使用 X 射线衍射仪和扫描电子显微镜评估这些 REO 的烧结盘样品的结构和形态特性。从获得的结果来看，REO 材料根据其晶体结构和氢溶解度可清楚地分为两类：Sm2O3、Eu2O3、Gd2O3 和 Gd2O3 具有较高的氢溶解度和扩散率，而立方 Y2O3、Dy2O3、Er2O3 和 Yb2O3 具有较低的氢溶解度和扩散率。目前的研究表明，立方体 REO 可能适用于核聚变反应堆作为氚屏障材料。