Diffusion of point defects in shocked molecular crystals

作者：Skryl Y; Kuklja MM^*

来源：Physical Review B, 2005, 71(9): 094109.

DOI：10.1103/PhysRevB.71.094109

The dynamic response of a molecular crystal containing defects to shock wave loading is modeled and the resulting diffusion of point defects is simulated. It is shown that diffusion proceeds not only via the stress assisted diffusion, which is point defect diffusion in a stress field, also known as the Gorsky effect, but also through defect diffusion in the field of inertial forces. The method for modeling diffusion of point defects in shocked solids is developed. It is shown that diffusion in the inertial field significantly exceeds the stress diffusion in organic molecular crystals. Interplay between stress-assisted and inertial diffusion leads to the separation of light particles from heavy particles due to the shock wave front excitation, e.g., heavy and light molecules diffuse to different directions from the wave front. The diffusion mechanisms and the separation effect are discussed in great detail for organic molecular crystals under shock wave excitation.

• 出版日期2005-3
• 单位国家自然科学基金委员会