Improper Ferroelectrics. Structural Studies of LiNH4SO4

Abstract

The room temperature crystal structure of LiNH4SO4, complete with the positions of the hydrogen ions, has been determined from neutron diffraction measurements. X-ray diffraction study has shown that the abrupt ferroelectric transition of LiNH4SO4 near 11 C involves a doubling of the orthorhombic unit cell normal to the polar axis. The phonon dispersion in this material above the transition temperature was explored by means of inelastic neutron scattering, but no soft phonon mode associated with the structural transition could be found.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1978
Accession Number
ADA065770

Entities

People

  • James S. Kouvel
  • Paul M. Raccah
  • Rastko C. Maglic

Organizations

  • University of Illinois at Chicago

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Brillouin Zones
  • Corporations
  • Crystal Structure
  • Diffraction
  • Electronics
  • Inelastic Scattering
  • Jet Propulsion
  • Low Temperature
  • Materials
  • Materials Laboratories
  • Military Research
  • Neutron Diffraction
  • Neutron Scattering
  • Optical Properties
  • Protons
  • Scattering
  • Transition Temperature

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.