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- W2000385892 abstract "Abstract For studying hydrogen binding and electronic surface effects in the metal hydrogen system Nd 2 (Fe/Co) 14 B SIMS (secondary ion mass spectrometry) is applied to hydrogen free and in situ hydrogenated alloys. Hydrogenation under UHV conditions is achieved by use of D 2 + ion implantation during SIMS measurements. Specific information on hydrogen surface binding characteristics and hydrogen-induced electronic effects are obtained by analyzing secondary ion cluster pattern from positive and negative SIMS spectra. The SIMS data confirm and complete our XPS results. They show a significantly different behavior of the Fe- and Co-alloy against hydrogen with respect to secondary ion emission. The cluster ion emission pattern of Nd 2 Fe 14 B primarily reflects the properties of rather isolated elements, while the situation in Nd 2 Co 14 B points to a more stable chemical bonding between the alloy components. This observation became obvious also in XPS investigations [D. Lebiedz, H. Zuchner, O. Gutfleisch, Chem. Mater., in press] as well as the HDDR process [O. Gutfleisch, I.R. Harris, J. Phys. D: Appl. Phys. 29 (1996) 2255]. Hydrogenation leads to changes of the secondary ion cluster intensities and composition concerning Nd containing cluster ions, which again emphasizes the high significance of the lanthanoid for hydrogen binding. Additionally, the SIMS data suggest that the kind of transition metal (Fe and Co) plays an essential role for the first step of hydrogen uptake, the hydrogen dissociation at the metal surface. In that respect, Fe in Nd 2 Fe 14 B has turned out to be catalytically more effective than Co." @default.
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- W2000385892 date "2003-08-01" @default.
- W2000385892 modified "2023-09-25" @default.
- W2000385892 title "A secondary ion mass spectrometry study of hydrogen interaction with Nd2(Fe/Co)14B" @default.
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- W2000385892 doi "https://doi.org/10.1016/s0925-8388(03)00288-3" @default.
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