| Autor: |
Wu, Wei, Guo, Defeng, Li, Wei, Li, Lanlan, Sun, Hongyu, Zhang, Xiangyi, Li, Xiaohong, Liu, Baoting |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; Oct2008, Vol. 104 Issue 8, p086103, 3p, 1 Black and White Photograph, 3 Graphs |
| Abstrakt: |
We have measured the pressure dependence of the growth of α-Fe and Nd2Fe14B nanocrystals in amorphous Nd9Fe85B6 up to 6 GPa at a temperature of 923 K, yielding an activation volume of ΔV*=(0.76±0.04) and (0.57±0.05)Ω for atomic diffusion in the growth process of α-Fe and Nd2Fe14B nanocrystals, respectively, where Ω is the mean atomic volume of the alloy. This demonstrates that the growth of nanocrystals is dependent on atomic diffusion mediated by vacancy-type thermal defects. Atomic processes of the growth of nanocrystals are discussed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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