Nanocavity Shrinkage and Preferential Amorphization during Irradiation in Silicon

Void melting in solids is a very complicated process, while the mechanism is far from understood. In this paper, we studied the void melting in Pd and Si solids using a molecular dynamics simulation method. It is found that there exist two different melting mechanisms for nanovoid, nucleation melting and non-nucleation melting; although void melting in Pd follows the former mechanism, that in Si follows the latter (unless the nanovoid size decreases to a critically small value). For nucleation melting, there will be liquid nucleate at the surface of the nanovoid, and then the liquid fills the void before the temperature reaches the melting point of the solids. For nonnucleation melting, there will be local stiffening around the nanovoid, and the nanovoid always exists until the whole matrix comes to melt. For these two different melting mechanisms, the inner surface atoms will behave totally differently. We find the most exciting thing to be that the two mechanisms can be well unified based on surface melting theory. Furthermore, it is predicted that when the nanovoid decreases to a critical value the matrix solid may be superheated, which agrees well with the simulation of void melting in Pd and Si solid.

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Shrinkage of nanocavities in silicon during electron beam irradiation

Zhu

2006

Journal of Applied Physics

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An internal shrinkage of nanocavity in silicon was in situ observed under irradiation of energetic electron on electron transmission microscopy. Because there is no addition of any external materials to cavity site, a predicted nanosize effect on the shrinkage was observed. At the same time, because there is no ion cascade effect as encountered in the previous ion irradiation-induced nanocavity shrinkage experiment, the electron irradiation-induced instability of nanocavity also provides a further more convincing evidence to demonstrate the predicted irradiation-induced athermal activation effect.

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Nanocavity Shrinkage and Preferential Amorphization during Irradiation in Silicon

Cited by 6 publications

References 12 publications

Surface Energy of Nanostructural Materials with Negative Curvature and Related Size Effects

Surface Energy of Nanostructural Materials with Negative Curvature and Related Size Effects

Unification of Two Different Melting Mechanisms of Nanovoids

Shrinkage of nanocavities in silicon during electron beam irradiation

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