ENHANCED SURFACE LAYER DIFFUSION IN NON-METALLIC COMPOUNDS.

Abstract

The literature on the subject of enhanced surface layer diffusion in non-metallic compounds is critically reviewed. It is concluded that the enhancement results from an increase in the pre-exponential factor and that the diffusion mechanism is the same in both the bulk material and in the sub-surface layer. The space charge treatment of Lehovec is presented as the most fruitful source of a theoretical explanation, but it is also established that additional theoretical and experimental work must be undertaken to find the source of the observed increase in the pre-exponential factor of the diffusion coefficient. It is further concluded that, in general, dislocations do not contribte significantly to the enhanced diffusion in the sub-surface layer. Possible practical applications of the enhancement phenomenon are also presented. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1966
Accession Number
AD0634558

Entities

People

  • Henry C. Graham
  • Norman M. Tallan

Tags

DTIC Thesaurus Topics

  • Bulk Materials
  • Coefficients
  • Diffusion
  • Diffusion Coefficient
  • Dislocations
  • Literature
  • Materials
  • Metallic Compounds
  • Space Charge

Readers

  • Materials Science and Engineering.
  • Semiconductor Device Technology
  • Theoretical Analysis.

Technology Areas

  • Space