Experimental evidence for room-temperature intermetallic compound formation at the Pd/Al interface
The growth of Pd films on Al and Pd/Al interface formation were studied with use of ultraviolet photoemission spectroscopy (UPS) and low-energy ion scattering. At room temperature, the deposited Pd intermixes with the Al substrate and forms a thin surface alloy about 5 monolayers (ML) thick. Bulklike Pd states start to build up at E/sub F/ when the Pd coverage exceeds 4 ML. More than 8 ML of Pd are needed to completely cover the Al substrate and to fully develop the Pd metallic valence band. A Pd4d--derived band centered at 4 eV below E/sub F/ was observed both for monolayer Pd coverage on Al and for thick Al on Pd. It is argued that this deep-lying d band is due to the interaction between Pd and Al through the hybridization of the Pd d and Al s states.
- Research Organization:
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000
- OSTI ID:
- 6566575
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:3; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM
AMBIENT TEMPERATURE
ATOM TRANSPORT
CHEMICAL ANALYSIS
DIFFUSION
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION
FUNCTIONS
HYBRIDIZATION
INTERFACES
INTERMETALLIC COMPOUNDS
ION SCATTERING ANALYSIS
METALS
NEUTRAL-PARTICLE TRANSPORT
NONDESTRUCTIVE ANALYSIS
PALLADIUM
PHOTOEMISSION
PLATINUM METALS
RADIATION TRANSPORT
RADIATIONS
SECONDARY EMISSION
TRANSITION ELEMENTS
ULTRAVIOLET RADIATION
WORK FUNCTIONS