Accession Number : AD0725830

Title :   The Theory of Interatomic Potentials in Solids.

Descriptive Note : Internal memo.,

Corporate Author : STANFORD UNIV CALIF MICROWAVE LAB

Personal Author(s) : Harrison,Walter A.

Report Date : MAY 1971

Pagination or Media Count : 36

Abstract : The use of interactomic potentials in studying lattice vibrations is reviewed, with the conclusion that long-range interactions are required in all systems, and suggesting that empirical models can only succeed if they include the appropriate long-range form for the system in question. In simple metals pseudopotentials provide a theory of the interactions, which to lowest order appear as two-body, central-force interactions. The long-range part corresponds to Friedel oscillations. The reliability of the method in defect studies remains in question but current results are encouraging. The theory has been extended to noble and transition metals by direct addition of d-band and hybrid s-d contributions. This approach is promising but the corresponding interatomic interactions have not been tested. In valence crystals, the low-order perturbation theory fails and as a consequence non-central forces become essential to a representation of the interactions. Appropriate models for interatomic interactions in nonconductors and these are discussed. (Author)

Descriptors :   (*CRYSTAL LATTICES, *POTENTIAL ENERGY), VIBRATION, THEORY, METALS, INTERACTIONS, MATHEMATICAL ANALYSIS, BAND THEORY OF SOLIDS, CRYSTAL DEFECTS

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE