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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Reaction kinetics of H_2, O_2, and H_2O with rare earths (Y, La, Ce, Pr, Nd, Gd, Tb, Dy, and Er) at 298 K
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Reaction kinetics of H_2, O_2, and H_2O with rare earths (Y, La, Ce, Pr, Nd, Gd, Tb, Dy, and Er) at 298 K

机译：H_2，O_2和H_2O与稀土（Y，La，Ce，Pr，Nd，Gd，Tb，Dy和Er）在298 K下的反应动力学

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摘要

High reactivity of rare earths (RE) with H_2,O_2 and H_2O is well known even at room temperature. The formation of stable surface oxides/hydroxides on the surface is the one of serious problems in the production and use of materials containing RE. We have investigated the quantitative reactivities of H_2, O_2, and H_2O with the surface of Y, La, Ce, Pr, Nd, Gd, Tb, Dy, and Er under ultra high vacuum condition. The H_2, O_2 and H_2O gases exhibited the highest reactivity on the clean surface of the RE at 298 K. This means that all gas molecules impinging the surface dissociate and chemisorbed. The O atoms dissociated from O_2 adsorb to for oxides layers of the metals. The H atoms dissociated from H_2 diffuse into the metals to form hydrides which were found to decrease the H_2 reactivity. The H atoms dissociated form H_2O diffuse into the metals or form hydroxides of the metals. With increasing coverage of each gas molecules, the reactivity of each gas was decreased by several orders of magnitude.
机译：众所周知，稀土（RE）与H_2，O_2和H_2O的反应性很高，即使在室温下也是如此。在表面上形成稳定的表面氧化物/氢氧化物是含RE材料的生产和使用中的严重问题之一。我们研究了在超高真空条件下，H_2，O_2和H_2O在Y，La，Ce，Pr，Nd，Gd，Tb，Dy和Er表面的定量反应性。 H_2，O_2和H_2O气体在298 K的RE清洁表面上表现出最高的反应性。这意味着撞击表面的所有气体分子都发生离解和化学吸附。从O_2解离的O原子吸附成金属的氧化物层。从H_2解离的H原子扩散到金属中形成氢化物，发现氢化物会降低H_2反应性。从H_2O解离的H原子扩散到金属中或形成金属的氢氧化物。随着每种气体分子覆盖率的提高，每种气体的反应性降低了几个数量级。

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