Nanoscale duplex oxide growth during early stages of oxidation of Cu-Ni(100).

Journal Article · Thu Oct 01 04:00:00 EDT 2009 · Phys. Rev. B

DOI:https://doi.org/10.1103/PhysRevB.80.134106· OSTI ID:977043

Zhou, G; Fong, D D; Wang, L; Fuoss, P H; Baldo, P M; Thompson, L J; Eastman, J A

A combination of real-time in situ synchrotron x-ray diffraction and ex situ transmission electron microscopy is utilized to investigate the early stages of oxidation of Cu-Ni(100). Sequential formation of NiO and Cu{sub 2}O oxides was observed by increasing oxygen partial pressure, and the Cu{sub 2}O phase was identified to form preferentially on top of NiO nanoislands. The origin of this unexpected phenomenon is attributed to localized enrichment of Cu atoms accompanied with NiO growth, which thermodynamically drives the nanoscale Cu{sub 2}O/NiO duplex oxide growth.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NSF
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 977043
• Report Number(s): ANL/MSD/JA-65253
• Journal Information: Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: Oct. 2009 Vol. 80; ISSN 1098-0121
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

43 PARTICLE ACCELERATORS
ATOMS
ORIGIN
OXIDATION
OXIDES
OXYGEN
PARTIAL PRESSURE
SYNCHROTRONS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION