Determinableness of the reduced frequencies from the observable diffusional self-correlation functions
Abstract
It has been shown that the maximum number of the reduced frequencies determinable from the diffusional self-correlation function of the impurity equals twice the number of different nearest neighbour shells surrounding an impurity. The latter statement is valid in the encounter approximation applied to the unbounded diffusion of the impurity via the monovacancy mechanism in the lattices having all sites equivalent. Therefore, only two frequencies can be measured for cubic lattices and four frequencies for hexagonal lattices at most. The number of indeterminable frequencies increases rapidly with the increasing complexity of the diffusion model.
- Publication:
-
Physica B Condensed Matter
- Pub Date:
- January 1991
- DOI:
- 10.1016/0921-4526(91)90193-I
- Bibcode:
- 1991PhyB..168...80R