MICROSCOPIC THEORY OF FERROELECTRICITY.

Abstract

A detailed formulation is given to the supposition that a polarized phase in ionic dielectrics can arise from the vibronic instability mechanism (Jahn-Teller effect) due to the valence electrons. The thermodynamical consequences of this hypothesis are worked out for BaTiO3. The contribution of the vibronic coupling to the temperature dependence of the soft mode in BaTiO3 is calculated. We use a frequency renormalization method to derive the effect of the soft mode on other long wavelength modes near the transitions. Last, the behavior of the optical vibrational frequencies in a finite-sized (or domain-structured) specimen is studied. (Author)

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1967
Accession Number
AD0825499

Entities

People

  • Haim Yatom
  • Raphael Ruppin
  • Robert Englman

Organizations

  • Israel Atomic Energy Commission

Tags

DTIC Thesaurus Topics

  • Couplings
  • Dielectrics
  • Electrons
  • Ferroelectricity
  • Frequency
  • Instability
  • Long Wavelengths
  • Transitions

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Plasma Physics / Magnetohydrodynamics
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene