Fracture and Hardness Characteristics of Semiconductor Alloys

Abstract

We have studied the properties of semiconductor compounds and alloys as they relate to the mechanical and structural behavior of the materials. We have calculated the deviations from randomness including contributions from strain, chemical and Coulomb energies. Surfaces have been examined and substantial surface segregation is found to occur in several alloy systems. Extraction energies in the alloys are found to be very sensitive to the alloy environment and may have important consequences on diffusion. An effective medium theory of the bulk modulus has been developed and show that the bulk modulus varies nearly linearly with alloy composition. Finally the Sher model of hardness has been improved by the inclusion of the dissipative term arising from the Peierls stress in the lattice. Hardness, Coulomb energies, Semiconductor alloys.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1988
Accession Number
ADA204807

Entities

People

  • A. Sher
  • An-ban Chen
  • M. A. Berding
  • M. Van Schilfgaarde

Organizations

  • SRI International

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Bulk Modulus
  • Classification
  • Diffusion
  • Dislocations
  • Electronics
  • Energy Bands
  • Extraction
  • Hardness
  • Materials
  • Materials Science
  • Mechanical Properties
  • Phase Diagrams
  • Security
  • Semiconductors
  • Temperature Gradients
  • Transition Temperature

Fields of Study

  • Materials science

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Materials Science and Engineering.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene