RESEARCH ON THE PRODUCTION AND PHYSICS OF SINGLE CRYSTAL EMITTERS

Abstract

Single crystals of tungsten and molybdenum from 1-10 cm long were produced by the Robison-plus-torsion technique in 4-5 mil filaments. These were studied in an improved electron projection diode, in which point-bypoint and average thermionic constants could be measured on the same filament. The work functions for various directions of single crystal molybdenum were found to be the same as those for single crystal tungsten. Also the average values of work function phi sub R and A sub R were 4.40 and 40 respectively, for both tungsten and molybdenum. Thermal treatment always developed facets on the crystal areas of high work function. These facets had highest thermal stability when a shingled structure developed on them during heating.

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Document Details

Document Type
Technical Report
Publication Date
Apr 20, 1964
Accession Number
AD0602713

Entities

People

  • E. A. Coomes

Organizations

  • University of Notre Dame

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Accumulators
  • Air Force
  • Crystal Structure
  • Crystals
  • Emission
  • Emitters
  • Heat Energy
  • Heat Treatment
  • Materials
  • Measurement
  • Metals
  • Molybdenum
  • Refractory Metals
  • Thermal Stability
  • Thermionic Emission
  • Tungsten
  • Work Functions

Readers

  • Materials Science and Engineering.
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene