CRYSTAL MORPHOLOGY AND MECHANISMS OF GROWTH OF ALPHA-FE2O3 WHISKERS ON IRON

Abstract

Growths on pure iron at 400 degrees C to 500 degrees C in dry oxygen were studied. Selected area electron diffraction patterns of individual whiskers as well as electron diffraction texture patterns of oxidized surfaces showed the whisker axis to be <-1-120>. The axial rotation indicated by the pattern is that resulting from an axial twist. The axial twist provides evidence that the most simple oxide whiskers have a single axial screw dislocation with a 5.03 A Burger's vector. Arguments are presented for the view that growth of the whisker occurs by diffusion of iron atoms or ions through the dislocation and reaction with oxygen at the tip.

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Document Details

Document Type
Technical Report
Publication Date
Dec 05, 1966
Accession Number
AD0646646

Entities

People

  • Earl A. Gulbransen
  • Richard L. Tallman

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Chemistry
  • Contractors
  • Contracts
  • Crystal Structure
  • Crystallography
  • Crystals
  • Diffraction
  • Diffusion
  • Diffusion Coefficient
  • Dislocations
  • Electron Diffraction
  • Electrons
  • Grain Boundaries
  • Materials
  • Military Research
  • Oxides
  • Surface Transportation

Fields of Study

  • Materials science

Readers

  • Aerodynamics.
  • Materials Science and Engineering.

Technology Areas

  • Microelectronics