RESEARCH AND DEVELOPMENT ON ADVANCED GRAPHITE MATERIALS, VOLUME XX. THE ELECTRIC AND MAGNETIC PROPERTIES OF PYROLYTIC GRAPHITE

Abstract

This paper concerns the electric and magnetic properties of a series of highly turbostratic pyrolytic graphic deposits. The diamagnetic susceptibility, Hall coefficient, and electron spin resonance g value are observed to have much larger magnitudes than corresponding measurements made on single crystals of graphite. The results are interpreted as being due to the turbostratic character of the deposit which brings about a decreased interaction between the randomly rotated graphitic planes. The overlap of the electron and hole bands is thereby reduced and as a first approximation one can interpret the results using the simple two dimensional model of Wallace. McClure's diamagnetism formula, which is based on the Wallace model, yields a maximum trace value of -39 emu/g. The largest observed value is -33.5 emu/g, a diamagnetism almost 50% greater than the normal single crystal value of -22.8 emu/g.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1963
Accession Number
AD0426185

Entities

People

  • B. H. Eckstein
  • G. Wagoner

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Space

DTIC Thesaurus Topics

  • Band Structures
  • Band Theory Of Solids
  • Crystals
  • Electrical Properties
  • Electron Spin Resonance
  • Energy Bands
  • Fermi Levels
  • Magnetic Properties
  • Materials
  • Materials Laboratories
  • Measurement
  • Resonance
  • Single Crystals
  • Spin Resonance
  • Three Dimensional
  • Two Dimensional
  • X Rays

Readers

  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Reinforced Composite Materials
  • Superconducting Magnet Technology

Technology Areas

  • Microelectronics