Surface and grain boundary energies of silver at oxygen pressures lower than 10−15Pa

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Abstract
By combining measurements using the zero-creep technique with measurements of the dihedral angle of thermally etched grooves on a grain boundary, the average values of surface energy and grain boundary energy have been determined for high-purity silver at 1211 K in hydrogen atmosphere with oxygen partial pressure not higher than 5 × 10−16 Pa (cca 3–8 × 10−18 torr). For the surface energy σs and the grain boundary energy σGB values 1–520 ± 0–210 and 0–480 ± 0–109 J/m2, respectively, were found. The value of σs is considerably higher than the values published by other authors. This is ascribed to the significantly lower partial pressure of oxygen in the atmosphere used. The value of the lattice self-diffusion coefficient in silver was estimated asD SD = 4–74 × 10−3 m2/sec, in very good agreement with the values obtained by other authors performing diffusional measurements.

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