Phase equilibria, high conductivity ambient temperature liquids, and glasses in the pseudo-halide systems AlCl3-MSCN (M = Li, Na, K)

Changle Liu, Charles Angell

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

In the family of pseudo binaries, xAlCl3-(1 - x)MSCN (M = Li, Na, or K), ambient-temperature molten salt solutions are formed over the composition range, 0.35 < x < 0.75. These molten salt solutions readily form glasses. A partial determination of the phase equilibria for these pseudo binaries was made. For all three AlCl3-MSCN systems, a eutectic occurs at ∼65 mol % AICl3 and at 50, 55, and 70°C, for M = Li, Na, and K, respectively, in striking resemblance to the corresponding MCI-AICl3 systems. The decoupling of conductivity from viscosity is very pronounced amounting to almost 9 orders of magnitude for LiAlCl3SCN at Tg, and more for the Na case. The highest room temperature conductivity observed was ∼10-3(Ω - cm)-1 for M = Li and x = 0.6. Upon adding ∼24 mole % LiAlC4, the conductivity increases to values of log (σ/(Ω - cm) 1) = - 3.9, - 2.3 and - 1.0 at 0°C, 25°C and 100°C, respectively. With little change of conductivity, the eutectic compositions assume a gel-like consistency after long periods at room temperature, apparently due to homogeneously nucleated, possibly metastable, crystalline phases.

Original languageEnglish (US)
Pages (from-to)467-473
Number of pages7
JournalSolid State Ionics
Volume86-88
Issue numberPART 1
DOIs
StatePublished - Jul 1996

Keywords

  • Ambient temperature liquids
  • Conductivity
  • Glass formation
  • Phase equilibrium
  • Pseudo binary systems

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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