Stability and Properties of Compositionally Modulated Films.

Abstract

The thermodynamics and kinetics governing the stability of compositionally modulated materials are reviewed. Typical results of experiments on fcc and amorphous metals are presented to demonstrate the effects of interdiffusion. Two coarsening mechanisms are analyzed, as is the stability of orthogonal waves in phase separating systems. The interdiffusivity between amorphous Si and Ge in the temperature range 550-630K is 1.07x10 to the minus 10th power exp(-1.6 ev/kT)m2 1/s, for a modulation wavelength of 5.83 nm. No crystallization occurred during the anneals. The theories for the enhancement of the elastic modulus in crystalline compositionally modulated films are reviewed. Both the Fermi sphere-Brillouin zone interaction model and the coherency stress model are found to be inadequate and insufficiently developed. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1985
Accession Number
ADA164574

Entities

People

  • F. Spaepen
  • R. C. Cammarata
  • S. M. Prokes

Organizations

  • Harvard University

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Amorphous Materials
  • Band Structures
  • Composite Materials
  • Crystal Structure
  • Crystals
  • Diffraction
  • Long Wavelengths
  • Materials
  • Materials Science
  • Mechanical Working
  • Mechanics
  • Military Research
  • Modulus Of Elasticity
  • Plastic Properties
  • Solid State Physics
  • Thermodynamics
  • X Rays

Readers

  • Materials Science and Engineering.
  • Optical Physics and Photonics.
  • Thin Film Deposition Science.