A Scientific Basis for an Alternate Cathode Architecture.

Abstract

The main effort of this research has been to try to bring together in a simplified manner both theoretical and experimental studies basic to the analysis of thermionic emission from Impregnated Dispenser Cathodes (IDC) as it is understood at this time. This study revealed two major areas of uncertainty: (1) the electronic and steric nature of the cathode emissive surface, and (2) the lack of a reproducible impregnation procedure. Mossbauer Spectroscopy was used to probe cathode surfaces and revealed that enhanced thermionic emission was concomitant with the presence of a low-spin state transition metal ion. The existence of the low-spin Mossbauer probe led to a formulation of a hypothetical surface considerations. This model had a striking parallelism with similar systems in the field of heterogeneous supported catalysis (HSC), viz., the hexagonal barium titanates (HBT). Keywords: Thermionic emission, Mossbauer spectroscopy, Differential thermal analysis, Crystal field theory, Metal metal bond.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1988
Accession Number
ADA191498

Entities

People

  • E. J. Daniszewski

Organizations

  • Rome Laboratory

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemical Compounds
  • Chemical Reactions
  • Chemical Synthesis
  • Chemistry
  • Crystal Lattices
  • Crystal Structure
  • Gamma Rays
  • Materials
  • Measurement
  • Nuclear Energy Levels
  • Phase Diagrams
  • Quantum Properties
  • Solid State Physics
  • Solid State Properties
  • Spectroscopy
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Electronics Engineering
  • Organic Chemistry
  • Surface Engineering/Surface Coating Technology.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene