The temperature-evolution of the atomic structure and diffusivity of several liquid transition metals were studied (table 4). It was found that the relatively low order atomic clusters of rhombohedra-related structures increased with an increase in temperature according to Honeycutt-Andersen indices analysis. The local distortion would largely enhance the self diffusivity in the liquid metals. The excess entropy and the diffusion coefficients were well agreement with the universal scaling law proposed by Dzugutov. The comparison of the calculated diffusivity with predictions of four diffusion models showed that the agreement of the density fluctuation model was found to be extremely good. The results presented a good understanding of the diffusion mechanism in liquid metals.
Temperature-Evolution of Structure and Diffusion Properties of Liquid Transition Metals. Yang, S., Su, X., Wang, J., Yin, F., Li, Z., Chen, S., Liu, C.: Journal of Non-Crystalline Solids, 2010, 356[20-22], 1061-9
Table 4
Self-diffusion coefficients of liquid metals
Temperature (K) | Metal | D (m2/s) |
594 | Cd | 2.706 x 10-9 |
610 | Cd | 2.90295 x 10-9 |
638 | Cd | 3.25695 x 10-9 |
666 | Cd | 3.49388 x 10-9 |
694 | Cd | 3.8318 x 10-9 |
800 | Cd | 4.83931 x 10-9 |
900 | Cd | 5.6624 x 10-9 |
1000 | Cd | 6.92621 x 10-9 |
1235 | Ag | 2.29212 x 10-9 |
1275 | Ag | 2.63778 x 10-9 |
1295 | Ag | 2.79178 x 10-9 |
1315 | Ag | 2.82638 x 10-9 |
1335 | Ag | 2.99353 x 10-9 |
1357 | Cu | 2.4986 x 10-9 |
1370 | Cu | 2.65615 x 10-9 |
1384 | Cu | 2.7755 x 10-9 |
1412 | Cu | 2.79943 x 10-9 |
1426 | Cu | 2.8334 x 10-9 |
1600 | Ag | 4.73303 x 10-9 |
1600 | Cu | 4.14343 x 10-9 |
Table 4 (continued)
Self-diffusion coefficients of liquid metals
Temperature (K) | Metal | D (m2/s) |
1800 | Ag | 6.38078 x 10-9 |
1800 | Cu | 5.61702 x 10-9 |
2000 | Ag | 8.02602 x 10-9 |
2000 | Cu | 7.40987 x 10-9 |
2200 | Ag | 9.90748 x 10-9 |
2200 | Cu | 9.33608 x 10-9 |
2400 | Ag | 11.4251 x 10-9 |
2400 | Cu | 11.0312 x 10-9 |
2600 | Cu | 13.3789 x 10-9 |