Oxygen induced dissolution and segregation of silicon in platinum single crystals
Journal Article
·
· J. Vac. Sci. Technol.; (United States)
The segregation of silicon in platinum flat (111), stepped (553) and (332) surfaces is studied as a function of crystal temperature. Silicon segregates below 1000/sup 0/C with a segregation energy between 17 and 20 kcal/mol. In the retarding field mode, the maximum amount of segregated Si corresponds to a Si (93 eV)/Pt (242 eV) Auger peak ratio of about 5. In the presence of O/sub 2/, Si dissolves into the bulk at T> or approx. =600/sup 0/C. The rate of Si dissolution increases with O/sub 2/ pressure and crystal temperatures. At an O/sub 2/ pressure of 5 x 10/sup -7/ Torr, the activation energy for the dissolution process is 16 +- 2 kcal/mol. Continued exposure to O/sub 2/ results in the reappearance of Si at the Pt surface as a new phase, SiO/sub x/, characterized by Auger peaks of Si (84 eV) and O (515 eV).
- Research Organization:
- Materials and Molecular Research Division, Lawrence Berkeley Laboratory, and Department of Chemistry, University of California, Berkeley, California 94720
- OSTI ID:
- 6246038
- Journal Information:
- J. Vac. Sci. Technol.; (United States), Journal Name: J. Vac. Sci. Technol.; (United States) Vol. 19:3; ISSN JVSTA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Reactive and nonreactive scattering of modulated molecular beams from well characterized platinum single crystal surfaces. [Mechanism, rainbow scattering, angular distribution]
Ab initio quantum mechanical studies of the kinetics and mechanisms of silicate dissolution: H{sup +}(H{sub 3}O{sup +}) catalysis
Ab-initio studies of the kinetics and mechanisms of feldspar dissolution: Ion exchange, H[sub 3][sup +]O catalysis, and the formation of leached layers
Technical Report
·
Thu Nov 30 23:00:00 EST 1978
·
OSTI ID:6229231
Ab initio quantum mechanical studies of the kinetics and mechanisms of silicate dissolution: H{sup +}(H{sub 3}O{sup +}) catalysis
Journal Article
·
Wed Nov 30 23:00:00 EST 1994
· Geochimica et Cosmochimica Acta
·
OSTI ID:28810
Ab-initio studies of the kinetics and mechanisms of feldspar dissolution: Ion exchange, H[sub 3][sup +]O catalysis, and the formation of leached layers
Conference
·
Tue Dec 31 23:00:00 EST 1991
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:5690848
Related Subjects
36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ACTIVATION ENERGY
CRYSTALS
DATA
DISSOLUTION
ELEMENTS
ENERGY
EXPERIMENTAL DATA
HIGH TEMPERATURE
HIGH VACUUM
INFORMATION
METALS
MONOCRYSTALS
NONMETALS
NUMERICAL DATA
OXYGEN
PLATINUM
PLATINUM METALS
SEGREGATION
SEMIMETALS
SILICON
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
360104* -- Metals & Alloys-- Physical Properties
ACTIVATION ENERGY
CRYSTALS
DATA
DISSOLUTION
ELEMENTS
ENERGY
EXPERIMENTAL DATA
HIGH TEMPERATURE
HIGH VACUUM
INFORMATION
METALS
MONOCRYSTALS
NONMETALS
NUMERICAL DATA
OXYGEN
PLATINUM
PLATINUM METALS
SEGREGATION
SEMIMETALS
SILICON
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS