2024-03-29T05:51:39Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00018682
2023-01-16T04:07:31Z
320:321:322
Characterization of Nb hydrides synthesized in high-pressure supercritical water by micro-beam hard X-ray photoelectron spectroscopy
Soda, Kazuo
Kondo, Hiroki
Kato, Masahiko
Shiraki, Tatsuhito
Niwa, Ken
Kusaba, Keiji
Hasegawa, Masashi
Ikenaga, Eiji
open access
This is the author's version of a work that was accepted for publication in Journal of Electron Spectroscopy and Related Phenomena. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms, may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Electron Spectroscopy and Related Phenomena. v.186, 2013, p.54–57, DOI:10.1016/j.elspec.2013.02.006.
Hard X-ray photoelectron spectroscopy
Nb hydrides
Nb 2p spectra
Valence-band spectra
Chemical shifts
We have characterized Nb hydrides synthesized in high-pressure supercritical water by hard X-ray photoelectron spectroscopy. Comparison is made, in particular, of the Nb 2p core level spectra and valence band ones for the Nb hydride specimens in different stages of hydrogenation with those for Nb oxide and metallic references. The Nb 2p core level spectra of the Nb hydride specimens synthesized at relatively low temperature show an intense Nb2O5 component and a shoulder structure, which is attributed to Nb hydrides, at the high binding energy side of a metallic component of the Nb metal. The valence band spectra of the Nb hydride specimens also show a broad band at the binding energy EB between 5 and 9 eV, which is ascribed mainly to Nb oxides. The present results indicate that the surface of the synthesized Nb hydrides is covered with several 10 nm thick Nb oxides and suggest that the Nb hydrides are formed deep inside the specimens. The Nb 2p chemical shift implies the Nb valence of +1.4 for the synthesized hydride NbHx.
Elsevier
2013-02
eng
journal article
AM
http://hdl.handle.net/2237/20777
https://nagoya.repo.nii.ac.jp/records/18682
https://doi.org/10.1016/j.elspec.2013.02.006
0368-2048
Journal of Electron Spectroscopy and Related Phenomena
186
54
57
https://nagoya.repo.nii.ac.jp/record/18682/files/HXPES_NbHx_revisedText2r.pdf
application/pdf
270.7 kB
2018-02-21