| Autor: |
Kizuka, Tokushi, Nakagami, Yuko, Ohata, Tohru, Kanazawa, Ikuzo, Ichinose, Hideki, Murakami, Hideoki, Ishida, Yoichi |
| Zdroj: |
Philosophical Magazine A; March 1994, Vol. 69 Issue: 3 p551-563, 13p |
| Abstrakt: |
Positron annihilation spectroscopy was carried out on nanocrystalline silver. Both lifetime and Doppler broadening were measured. High-resolution electron microscopy observations were also performed. Diffuse vacancy clusters, the sizes of which correspond to two to four vacancies, and voids of 1-5 nm diameter, were found to reduce the average atomic density of the grain boundary. Some grains grew to a diameter larger than about 70 nm during annealing the specimen from 50 to 100°C. A large fraction of the diffuse vacancy clusters and voids in the boundaries remained after annealing at 400°C. They were stabilized during annealing probably by gaseous atoms. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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