UNIFORM WORK FUNCTION CATHODE STUDIES FOR THERMIONIC CONVERTERS

Abstract

Chemical vapor deposition techniques are being studied as a possible means of producing nonplanar thermionic cathodes having a high degree of uniformity of work function. Vapor deposited molybdenum coatings have been produced by chemical reduction of molybdenum hexafluoride pyrolysis of molybdenum hexacarbonyl and pyrolysis of molybdenum pentachloride. Plating conditions were varied for each process to determine the effect of plating conditions on the preferred orientations of crystallographic planes parallel to the plating surfaces. Both (100) and (111) preferred orientations have been found for the hexafluoride reductions. The pentachloride samples have strong (100) orientations. The hexacarbonyl samples apparently are not pure molybdenum and do not have the expected molybdenum diffraction pattern.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1963
Accession Number
AD0296458

Entities

People

  • M. N. Huberman

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Carbonyl Complexes
  • Chemical Reactions
  • Chemical Vapor Deposition
  • Coatings
  • Converters
  • Crystal Growth
  • Crystal Structure
  • Crystals
  • Geometry
  • Materials
  • Partial Pressure
  • Statistical Samples
  • Thermionic Converters
  • Vapor Deposition
  • Work Functions
  • X Rays

Fields of Study

  • Chemistry
  • Materials science

Readers

  • Electronics Engineering
  • Organic Chemistry
  • Thin Film Deposition Science.