Dynamics of molten alkali halides

LiCl and DCl

L. Pusztai, R. L. McGreevy

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The authors have measured the inelastic neutron scattering spectra of three samples of molten 7LiCl with different isotopic chlorine compositions, and of one sample of molten KCl, using the time-of-flight spectrometer IN6 at the Institut Laue-Langevin. It is observed that the main peak in the total dynamical structure factor for LiCl is sharply peaked in both Q and omega directions, while that for KCl is much weaker and broader. The spectra for LiCl show evidence for two types of collective mode with characteristic energies of 10-20 and 40-50 meV. Using the differences between the samples, it is possible to show that appropriate pairs of dynamical variables for these modes are m+, -m- (low energies) and q+, -q- (high energies), whereas in molten CsCl the variables have been shown to be m+, m- and q+, q-. They propose that for the alkali chlorides (where the ionic radius ratio r+/r-+-, and the latter when m +>m-. There is a crossover between the variables, resulting in strong-mode coupling, when m+=m-. The data for KCl are consistent with this proposition.

Original languageEnglish
Article number010
Pages (from-to)2369-2380
Number of pages12
JournalJournal of Physics Condensed Matter
Volume1
Issue number13
DOIs
Publication statusPublished - 1989

Fingerprint

Alkali halides
alkali halides
Molten materials
Inelastic neutron scattering
Chlorine
Alkalies
time of flight spectrometers
Spectrometers
Chlorides
coupled modes
chlorine
energy
alkalies
crossovers
inelastic scattering
neutron scattering
chlorides
Chemical analysis
radii

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Dynamics of molten alkali halides : LiCl and DCl. / Pusztai, L.; McGreevy, R. L.

In: Journal of Physics Condensed Matter, Vol. 1, No. 13, 010, 1989, p. 2369-2380.

Research output: Contribution to journalArticle

Pusztai, L. ; McGreevy, R. L. / Dynamics of molten alkali halides : LiCl and DCl. In: Journal of Physics Condensed Matter. 1989 ; Vol. 1, No. 13. pp. 2369-2380.
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