Mobile ion crossover effects in the system LiFPbF2Al(PO3)3 from electrical, mechanical and Tg studies

A. R. Kulkarni, Charles Angell

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Fluorophosphate glasses in the system LiFPbF2Al(PO3)3 have been synthesized and the glass transition temperatures, de conductivities, and mechanical and electrical relaxations have been studied. The dc electrical conductivity shows a sharp minimum as a function of composition similar to that observed in mixed alkali glasses. It is likewise here attributed to the presence of two mobile ions (Li+ and F-) but primarily through their effect on the liquid structural relaxation rather than on their individual mobilities. It may therefore not imply a crossover in Li+ and F- mobilities. The electrical and mechanical relaxation behavior have been compared in the isofrequency-inverse temperature representation. Phenomena characteristic of the mixed effect are found; the most probable relaxation times for the two responses show a crossover. The electrical relaxations in some of these mixed conducting glasses are among the broadest yet observed, yet the maximum width is not found at the conductivity minimum. It is suggested that the halfwidth maximum rather than the conductivity minimum may signal the mobility crossover.

Original languageEnglish (US)
Pages (from-to)195-209
Number of pages15
JournalJournal of Non-Crystalline Solids
Volume99
Issue number2-3
DOIs
StatePublished - 1988
Externally publishedYes

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crossovers
fluorophosphate
Ions
Glass
conductivity
Anelastic relaxation
glass
Structural relaxation
ions
Alkalies
Relaxation time
glass transition temperature
alkalies
relaxation time
Liquids
Chemical analysis
conduction
electrical resistivity
liquids
Temperature

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

Mobile ion crossover effects in the system LiFPbF2Al(PO3)3 from electrical, mechanical and Tg studies. / Kulkarni, A. R.; Angell, Charles.

In: Journal of Non-Crystalline Solids, Vol. 99, No. 2-3, 1988, p. 195-209.

Research output: Contribution to journalArticle

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