DIFFUSION OF DILUTE BORON IN SINGLE-CRYSTAL ALUMINUM

Relaxation-time T1 measurements are made on the polarization of diffusing B12 implanted in single-crystal aluminum, as a function of crystal orientation and temperature. A model of uncorrelated random walk from one octahedral interstitial site to another is used to calculate η, the percentage change in T1 between the [111̄] and [001] directions. At its maximum η is three times larger than predicted indicating a clear deviation from uncorrelated-random-walk diffusion. © 1979 The American Physical Society.