EFFECT OF OXYGEN POTENTIAL ON THE SURFACE SELF-DIFFUSION COEFFICIENT OF SILVER.

Abstract

The surface self-diffusion coeffilcient was measured by the grain boundary grooving method in atomospheres with various oxygen potentials. In an argon atmosphere with P(O)//2 equals 10** minus **1**1 Pa, the surface self-diffusion coefficient can be expressed by the equation: D//s equals 0. 249 exp ( minus 166 kJ/mol multiplied by (times) RT) m**2/s (973-1073 K). The surface self-diffusion coefficient at P(0)//2 equals 10**5 Pa can be expressed by the equation: D//s equals 1. 71 multiplied by 10** minus **3 exp ( minus 106 kJ/mol multiplied by (times) RT) m**2/s (973-1073 K). A model for the surface structure at various oxygen potentials has been proposed.