A Study of Structural Phase Transitions Using Light Scattering Techniques.

Abstract

Raman and Brillouin light-scattering spectroscopy have been used to study variety of materials including Ag3AsS3 (proustite), Ag3SbS3 (pyrargyrite), NaKC4H406.4H20 (Rochelle salt), CaC4H406.4H20 (Calcium tartrate), Li2B407 (lithium diborate), BaTiO3 (barium titanate), Pb5Ge3011 (lead germanate), C3N3H3 (s-triazine) and SrTi03 (strontium titanate). Most of these materials undergo structural phase transitions of one kind of another and the spectroscopic date have been used to help identify and characterise these transitions where they exist. The presence of order-disorder phenomena is shown to be important in several instances but not necessarily directly involved in the phase-transition mechanism. In a subsidiary study a molecular crystal dynamics computer simulation has been carried out, successfully modelling the anharmonic behaviour of the crystal naphthalene.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1984
Accession Number
ADA147261

Entities

People

  • Wendy Taylor

Organizations

  • University of Edinburgh

Tags

Communities of Interest

  • Advanced Electronics
  • Sensors

DTIC Thesaurus Topics

  • Computer Simulations
  • Diffraction
  • Frequency
  • Light Scattering
  • Low Temperature
  • Molecular Dynamics
  • Neutron Diffraction
  • Phase Transformations
  • Piezoelectric Crystals
  • Raman Scattering
  • Raman Spectra
  • Refractive Index
  • Scattering
  • Spectra
  • Spectroscopy
  • Transition Temperature
  • X Rays

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Optical Physics and Photonics.
  • Organic Chemistry