Competitive interactions and glassy state extension in lithium salt solutions

Alwarappa Sivaraman, Hema Senapati, Charles Angell

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We report measurements of high- and low-temperature limits of the liquid states of aqueous solutions for two common aqueous salt solutions. The liquid range extends from the glass transition temperature to the boiling point, and is maximized when the anion basicity is minimized. These limits and other characteristic temperatures have been determined by DTA and DSC studies of solution samples which are used to generate the most complete phase diagram yet available for the LiBr + H2O system. The glass-formation region has been extended by developing an emulsification technique suitable for use with concentrated aqueous salt solutions. Comparison of boiling points, liquidus temperatures, and glass transition temperatures shows that the reduction of the water content below 3H2O per Li+ is accompanied by important energetic effects. These are not present in the corresponding lithium acetate solutions, which exhibit relatively much lower boiling points. This is attributed to the stronger water - anion interaction in the lithium acetate system which is proportional to the anion basicity. Water activity increases and boiling points are lowered when the anions are more basic, but total cohesion, manifested by the glass transition temperature, increases. By contrast, addition of anion complexing salts such as ZnBr2 and ZnCl2 to LiBr-H2O solutions to reduce the anion basicity results in increased boiling points to over 200 °C as well as decreased crystallization temperatures.

Original languageEnglish (US)
Pages (from-to)4159-4163
Number of pages5
JournalJournal of Physical Chemistry B
Volume103
Issue number20
StatePublished - 1999

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Lithium
Boiling point
Anions
Negative ions
boiling
Salts
lithium
anions
salts
Alkalinity
glass transition temperature
interactions
acetates
Temperature
Emulsification
Water
cohesion
liquidus
Liquids
liquids

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Competitive interactions and glassy state extension in lithium salt solutions. / Sivaraman, Alwarappa; Senapati, Hema; Angell, Charles.

In: Journal of Physical Chemistry B, Vol. 103, No. 20, 1999, p. 4159-4163.

Research output: Contribution to journalArticle

Sivaraman, Alwarappa ; Senapati, Hema ; Angell, Charles. / Competitive interactions and glassy state extension in lithium salt solutions. In: Journal of Physical Chemistry B. 1999 ; Vol. 103, No. 20. pp. 4159-4163.
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