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The Surface and Near Surface Structure of Metal-Metalloid Glasses
Abstract The nature of an amorphous solid is difficult to characterize, simply due to the lack of long range order, the presence of which allows crystalline surfaces to be efficiently characterized by the surface unit cell. Two recent model s of an amc1rphous surface [1, 2] have both portrayed a locally rough glassy surface. Garofalini’s pure metal element, one dimensional model yielded a cross sectional cut across an amorphous surface that would be traced by a surface diffusing atom [1]. Kowbel and Brower [2] utilized Gaskel’s trigonal prism morphology for the metal-metalloid chemical short range ordering in the bulk glass structure [3] to produce a two dimensional model and surface simulation of Pd80Si20 glass [2] and Fe80–B20 glass [4]. Both models predict an atomically rough glassy surface both normal to the surface and within the plane of the surface. The simulation of the surface of an Fe80B20 glass as generated by transsection lines across the hard sphere model is shown in Fig. 1. The fractal dimension was calculated to be 2.3, indicating a fine scale of roughness, and the average surface coordination number is 6, also indicating a locally rough surface as viewed by an adsorbant molecule. Such a scale of roughness on an Fe80B20 glass appears to be confirmed by the ion scattering experiments of Overbury et al [5].
The Surface and Near Surface Structure of Metal-Metalloid Glasses
Abstract The nature of an amorphous solid is difficult to characterize, simply due to the lack of long range order, the presence of which allows crystalline surfaces to be efficiently characterized by the surface unit cell. Two recent model s of an amc1rphous surface [1, 2] have both portrayed a locally rough glassy surface. Garofalini’s pure metal element, one dimensional model yielded a cross sectional cut across an amorphous surface that would be traced by a surface diffusing atom [1]. Kowbel and Brower [2] utilized Gaskel’s trigonal prism morphology for the metal-metalloid chemical short range ordering in the bulk glass structure [3] to produce a two dimensional model and surface simulation of Pd80Si20 glass [2] and Fe80–B20 glass [4]. Both models predict an atomically rough glassy surface both normal to the surface and within the plane of the surface. The simulation of the surface of an Fe80B20 glass as generated by transsection lines across the hard sphere model is shown in Fig. 1. The fractal dimension was calculated to be 2.3, indicating a fine scale of roughness, and the average surface coordination number is 6, also indicating a locally rough surface as viewed by an adsorbant molecule. Such a scale of roughness on an Fe80B20 glass appears to be confirmed by the ion scattering experiments of Overbury et al [5].
The Surface and Near Surface Structure of Metal-Metalloid Glasses
Brower, W. E. Jr. (author) / Tlomak, P. (author) / Pierz, S. J. (author)
1988-01-01
5 pages
Article/Chapter (Book)
Electronic Resource
English
Surface Hardening of Titanium with Metalloid Elements
| NTIS | 1952
Surface Hardening of Titanium with Metalloid Elements
| NTIS | 1954