Self-correlation functions for impurity diffusion in hexagonal lattices
Abstract
Long-range diffusion of the substitutional impurity in the otherwise monoatomic hcp-like lattices (H1 type) via the monovacancy mechanism has been considered within the encounter approximation. A five-frequency model (valid for cubic lattices) extends here naturally into a sixteen-frequency model, leaving fourteen normalized frequencies, the latter describing an anisotropic part of the self-correlation function. Two simplified cases can be distinguished: a self-diffusion being described by a single normalized frequency and a true hcp lattice, where only three normalized frequencies remain independent of each other. A general formalism is discussed and a few examples are evaluated numerically.
- Publication:
-
Hyperfine Interactions
- Pub Date:
- October 1989
- DOI:
- 10.1007/BF02609550
- Bibcode:
- 1989HyInt..52..107M