Accession Number:

AD0643956

Title:

COMPUTER INVESTIGATION OF RADIATION DAMAGE IN CRYSTALS.

Descriptive Note:

Final rept., Jun 65-Aug 66,

Corporate Author:

ATOMICS INTERNATIONAL CANOGA PARK CALIF

Personal Author(s):

Report Date:

1966-09-01

Pagination or Media Count:

100.0

Abstract:

A theoretical study of radiation damage in crystals has been performed, using computer techniques. The materials studied were three face-centered cubic metals copper, aluminum and gold. Two major areas of investigation were pursued 1 the study of various static configurations of lattice defects in copper and aluminum and 2 the study of threshold displacement energies in gold. The major focus of all work done was the effect of the choice of interatomic potential on the calculational results obtained. It is shown that the magnitude of the interstitial defect energies calculated is highly sensitive to the detailed form of the potential employed. With respect to vacancy characteristics, a potential for copper has been developed which leads to excellent agreement with experiment. In addition, a procedure is indicated for modifying this potential to also give meaningful results for interstitial characteristics. Of four Born-Mayer potentials studied for gold, it is shown that only the one derived on the basis of radiation damage data leads to good agreement with experiment for the 100 threshold energy. Threshold studies in the 110 direction indicated highly efficient propagation of energy along the collision line. However, it is concluded that no reasonable judgment concerning the 110 threshold energy can be made from the data obtained.

Subject Categories:

  • Radioactivity, Radioactive Wastes and Fission Products
  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE