Abstract
Void-lattice (VL) formation in crystals under high-temperature irradiation is an example of self-organization resulting from highly dissipative processes. There is strong experimental evidence that anisotropic migration of self-interstitial atoms (SI) is a prerequisite [1,2]. The present note summarizes a recent mesoscopic treatment of VL formation based on the same physical picture as the Woo-Frank theory [1,3,4], which operates on the level of macroscopic averages. The radiation-induced defects featuring in this theory are (1) metastable 1- dimensionally migrating Sis (crowdions), bringing in the anisotropic migration mentioned above, (2) stable 3-dimensionally migrating Sis (dumbbells), and (3) 3-dimensionally migrating vacancies.
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