被氧气毒化后LaNi_(4.7)Al_(0.3)的XPS分析

XPS Study of LaNi_(4.7)Al_(0.3) Alloy Poisoned by Oxygen

通过ＸＰＳ研究了被氧气毒化后ＬａＮｉ４．７Ａｌ０．３合金的Ｌａ、Ｎｉ、Ａｌ元素价态的变化，采用氢离子枪溅射刻蚀，获得了元素价态随深度的变化信息，结果表明，在表层生成物为Ｌａ（ＯＨ）３、ＬａＨ２、Ｎｉ、ＮｉＯ、 Ｎｉ２Ｏ３、Ａｌ２Ｏ３。当溅射到０．４ｍｉｎ时， Ｏ的谱峰发生了较为明显的变化，γ相的Ａｌ２Ｏ３增多，α相的Ａｌ２Ｏ３减少。当溅射到２．０ｍｉｎ时，合金的内表层 Ｎｉ２Ｏ减少，ＮｉＯ增多，合金的氧化程度减轻。当溅射到１０ｍｉｎ时，出现了金属Ｌａ。可见，表层氧化较充分，随着深度的增加，氧化程度减轻。

X-ray photoelectron spectra for the La, Ni, Al of LaNi4.7Al0.3 after poisoned by oxygen have been studied. After argon ion sputtering, the change of La, Ni, Al, O core level spectra with XPS sputter depth has been obtained. La(OH)3, LaH2, Ni, NiO, Ni2O3, Al2O3 were observed at the surface. Ols core levels changed after sputtering time of 0.4 min, γ-Al2O3 increased, α-Al2O3 decreased. Ni2O3 decreased, NiO increased in subsurface layer of alloy after sputter time of 2 min. Metallic La appeared after sputter time of 10 min. This indicates that the oxygenate of element's at the surface is serious. The oxygenation of elements is mitigated with the increase of depth.