Charge transfer processes and sputtering processes of self-sustaining alkali metal coatings on metal surfaces

Conference · Wed Jan 01 00:00:00 EST 1986

OSTI ID:7154951

Krauss, A R; Auciello, O; Uritani, A; Valentine, M; Mendelsohn, M; Gruen, D M

It is well known that adsorption of electronegative or electropositive atoms on a metal surface results in charge transfer between the metal conduction band and the adsorbate atom. This charge transfer results in the formation of a coverage-dependent image dipole and a consequent change in the work function and adsorbate binding energy. The secondary electron yield and the charge state of surface atoms desorbed by thermal, electron impact or ion impact desorption processes are closely related to the effective adsorbate charge. This paper discusses the effect of Gibbsian segregation (lowest free energy) as a means of producing similar effects for electropositive (alkali metal) layers on a number of metal substrates. Classical chemisorption theory is used as a means of estimating the adsorbate effective charge and results are compared with models used to predict the secondary ion fraction of sputtered atoms. The resulting concept of self-sustaining sputter-resistant coatings is analyzed in the context of applications to the fusion environment as well as to, e.g., materials for high current electrical contacts.

• Research Organization: Argonne National Lab., IL (USA); North Carolina State Univ., Raleigh (USA). Dept. of Nuclear Engineering; Nagoya Univ. (Japan). Inst. of Plasma Physics; Georgia Inst. of Tech., Atlanta (USA). Nuclear Engineering Dept.
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7154951
• Report Number(s): CONF-860807-2; ON: DE87004947
• Resource Relation: Conference: 6. international workshop on inelastic ion surface collisions, Argonne, IL, USA, 25 Aug 1986; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
SPUTTERING
COPPER BASE ALLOYS
LITHIUM ALLOYS
ADSORPTION
ALKALI METALS
ARGON IONS
AUGER ELECTRON SPECTROSCOPY
CHARGE TRANSPORT
CHEMISORPTION
COATINGS
DEUTERON BEAMS
FORMATION FREE ENTHALPY
HELIUM IONS
ION BEAMS
PHOTOELECTRON SPECTROSCOPY
SEGREGATION
SURFACES
ALLOYS
ALUMINIUM ALLOYS
BEAMS
CHARGED PARTICLES
CHEMICAL REACTIONS
COPPER ALLOYS
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
FREE ENTHALPY
IONS
METALS
PHYSICAL PROPERTIES
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
THERMODYNAMIC PROPERTIES
360106* - Metals & Alloys- Radiation Effects