非阻塞I/O
X射线光电子能谱
材料科学
主成分分析
谱线
分析化学(期刊)
氧化物
镍
合金
氧化镍
钛
化学
核磁共振
冶金
物理
数学
统计
催化作用
生物化学
色谱法
天文
作者
Kouta Sakamoto,Fumio Hayashi,Kazuyoshi Sato,Mitsuhiro Hirano,Naofumi Ohtsu
标识
DOI:10.1016/j.apsusc.2020.146729
摘要
XPS spectra collected from a mixture of NiO, TiO2, and NiTiO3 cannot be analyzed using a standard curve-fitting method; thus, principal component analysis (PCA) was conducted to accurately determine the ratio of various oxides in the mixture. Model samples comprising NiO, TiO2, and NiTiO3 exhibited a complex-shaped Ni 2p spectrum with a satellite peak, from which the atomic ratio of NiO and NiTiO3 could be accurately quantified using the PCA. In contrast, the Ti 2p spectrum exhibited a symmetric shape despite comprising both NiTiO3 and TiO2 states; thus, the PCA results predicted the ratio inaccurately. However, the PCA results showed linear correlation with the theoretical values over an entire range. Thus, accurate ratios were obtained using a calibration curve. The PCA procedure for multiple oxides was applied to angle-resolved XPS spectra for thermally oxidized nickel titanium alloy. The results revealed the in-depth distribution of NiO, TiO2, and NiTiO3 on the surface of the alloy.
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