Accession Number : AD0479394

Title :   THE EFFECT OF ADSORBED SULFUR ON THE SURFACE SELF-DIFFUSION OF COPPER.

Descriptive Note : Technical rept.,

Corporate Author : CARNEGIE INST OF TECH PITTSBURGH PA

Personal Author(s) : Collins, H. E. ; Shewmon, P. G.

Report Date : 01 FEB 1966

Pagination or Media Count : 28

Abstract : We have studied the effect of adsorbed sulfur on the surface self-diffusion of copper using eight different surface orientations and the grain boundary grooving method. The eight orientations studied were the four lying near the low index surfaces-(100), (111), and two directions in the (110) - plus four higher index surfaces. Surface diffusion measurements were made over a range of H2S concentrations (in H2) from 3 to 1500 ppm between 830 and 1050 C. The results can be divided into two groups - Group 1 contains the two (110) surfaces while Group 2 contains the remaining six surfaces. In Group 1, increasing the temperature increases the effect of H2S on D sub s for the H2S range equal to or less than 700 ppm. Q sub s and D sub o increase with increasing H2S concentration in this H2S range. Beyond this range, increasing the temperature decreased this effect on D sub s; also Q sub s and D sub o decreased. In Group 2, increasing the temperature decreases the effect of H2S on D sub s for the H2S range studied, and Q sub s and D sub o decrease with increasing H2S concentration. (Author)

Descriptors :   *SULFUR), *DIFFUSION), (*ADSORPTION, (*COPPER, SURFACES, HYDROGEN, SINGLE CRYSTALS, ANNEALING, HYDROGEN COMPOUNDS, SULFIDES, GRAIN BOUNDARIES, HIGH TEMPERATURE, IMPURITIES, ENTHALPY, CHEMISORPTION, MOBILITY.

Subject Categories : Physical Chemistry
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE