SURFACE PHYSICS OF METALS AND METAL OXIDES.
Final technical rept. 1 Jan 58-30 Jun 66.
CORNELL UNIV ITHACA N Y DEPT OF ENGINEERING PHYSICS
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The mechanisms of atomic and molecular processes occurring on metal and metal oxide surfaces was critically investigated from a theoretical and experimental viewpoint. Particular emphasis was placed on the role of crystalline imperfections and surface crystallography on such processes as chemisorption, oxide initiation, oxide film growth, surface diffusion and nucleation and growth from the vapor or gas phase. Limits of validity of the Wagner-Hauffe model for diffusion-controlled oxide film growth on pure magnesium and its alloys was established. The Bloomer model for oxide nuclei growth was also critically evaluated. A generalized model for the chemisorption of beta-nitrogen on tungsten was developed. Clarification of the contribution of point defects to the diffusion of oxygen in magnesium oxide and their application to oxidation and electrical conductivity in metal oxides was achieved. The capillarity theory of heterogeneous nucleation of metal oxides and vapors onto solid surfaces was modified and extended to the case of very small critical clusters in terms of a petit canonical assembly approach.
- Physical Chemistry