Accession Number : AD0282102

Title :   DEFECT COMPLEXES AND LITHIUM PRINCIPITATION IN GERMANIUM.

Corporate Author : MINNESOTA UNIV MINNEAPOLIS INST OF TECH

Personal Author(s) : Weltzin ,R. D. ; Swalin,A. R. A.

Report Date : 20 JUL 1962

Pagination or Media Count : 24

Abstract : The role of 0, gamma-ray bombardment, annealing temperature and and solute concentration in the nucleation of Li precipitates in Ge was investigated. Analysis of the experimental data indicates that the primary nucleation site for Li precipitation is an 0-vacancy defect pair. (In actuality since 0 is normally interstitially dissolved, this defect is equivalent to a substitutional 0.) The evidence indicates that about 1% of the 0 exists in this substitutional state. For the reaction 0 + V = 0-V it is determined that the binding enthalpy of the pair is -0.6eV. Li also exists in the paired state with interstitial 0 although these complexes apparently are not active as nucleating sites. At room temperature about 25% of the interstitial 0 atoms are paired according to the reaction Li(+) + 0 = Li(+)0. The heat of binding of the pair is calculated to be about -0.5 eV. The possible explanation as to why substitution 0 and not interstitial 0 is important in nucleation of Li is presented. (Author)

Descriptors :   *GERMANIUM, *LITHIUM, *SEMICONDUCTORS, CRYSTALS, GAMMA RAYS, HEAT TREATMENT, IMPURITIES, NUCLEATION, OXYGEN, RADIATION EFFECTS, SINGLE CRYSTALS, SOLID STATE PHYSICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE