Synchrotron-Radiation Study of Valence States and Electronic Structures of AgNi{1-x}Co{x}O2 Delafossite Oxides
SCIE
SCOPUS
- Title
- Synchrotron-Radiation Study of Valence States and Electronic Structures of AgNi{1-x}Co{x}O2 Delafossite Oxides
- Authors
- Kang, JS; Lee, SS; Lee, HJ; Kim, G; Kim, DH; Song, HK; Shin, YJ; Jung, MC; Shin, HJ; Lee, JE; Min, BI
- Date Issued
- 2009-06
- Publisher
- IEEE
- Abstract
- The electronic structures of AgNi1-xCoxO2 (0 <= x <= 1) delafossite oxides have been investigated by employing photoemission spectroscopy (PES) and X-ray absorption spectroscopy (XAS) in the soft X-ray regime of synchrotron radiation. The Ag 3d core-level PES spectra shift toward the higher binding energy with increasing x, in agreement with the metallic nature for low values of x and the insulating nature for high values of x in AgNi1-xCoxO2. Further, the Ag 3d core-level PES spectra become more asymmetric with decreasing x, which reflects the larger number of electron-hole pairs in the Ni-rich regime. Valence-band PES spectra reveal that the band width of the occupied Ni 3d states is broader than that of the Co 3d states, implying the larger Ni 3d-O 2p hybridization than the Co 3d-O 2p hybridization. The Co and Ni 2p XAS spectra show that Co ions are in the low-spin Co3+ states for all x, while Ni ions are in the Ni2+ - Ni3+ mixed-valent states. The Ni3+ component increases with x.
- Keywords
- Delafossite; electronic structure; PES; synchrotron radiation; XAS; X-RAY-ABSORPTION; TRANSITION-METAL COMPOUNDS; ELECTRICAL-PROPERTIES; PHOTOEMISSION; SPECTROSCOPY; SPECTRA; AGNIO2
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/26057
- DOI
- 10.1109/TMAG.2009.2018896
- ISSN
- 0018-9464
- Article Type
- Article
- Citation
- IEEE TRANSACTIONS ON MAGNETICS, vol. 45, no. 6, page. 2580 - 2583, 2009-06
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.