Accession Number:

ADA231820

Title:

Mechanical Properties of Semiconductors and their Alloys

Descriptive Note:

Annual rept. Mar-Oct 1990

Corporate Author:

SRI INTERNATIONAL MENLO PARK CA

Report Date:

1990-11-01

Pagination or Media Count:

26.0

Abstract:

This annual report of AFOSR contract F49620-88-K-0009 summarizes the work accomplished on studies of mechanical properties of semiconductors and their alloys, and plastic flow and intermetallic compounds. 1 A simple relationship between the elastic constants of semiconductor is found. 2 A systematic study of tight-binding parameters to fit cohesive energy, bulk modulus, and shear coefficients of all diamond and zinc-blende semiconductors has been carried out. 3 An additional, nonequilibrium mechanism is suggested as a possible explanation of ordering in lattice-matched alloys. 4 A KKR-CPA theory is being generalized to study semiconductors. 5 Based on our calculation of surface sublimation energies, a charge transfer mechanism is proposed that affect ordering on semiconductor surfaces. The surfaces of wide gap, ionic compounds are expected to exhibit superlattice arrangements of atoms and vacancies. Consequent effect on epitaxial growth is discussed. 6 Static structural and deformation properties, such as ideal twin-strength and ideal twin-stresses, of metals are studied in a non-self-consistent total energy calculations using the Harris-Foulkes approximation.

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE