Composition dependence of the solid state transitions in NaNO3/KNO3 mixtures

Wen Ping, Peter Harrowell, Nolene Byrne, Charles Angell

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Abstract

The results of a detailed calorimetric study of the NaNO3/KNO3 phase behaviour as a function of cation composition are presented. We conclude that the λ-transition in NaNO3 is significantly depressed and broadened by the presence of K+ ions. The α-β-transition in KNO3 is similarly affected. The possibility is considered that the depression of the λ-transition by addition of solute K+ ions is related to random field effects on model lattice transitions involving a continuous order parameter. Some brief remarks are made to contrast the fast ordering kinetics of the λ-transition with the slow kinetics, and structural arrests, obvious in supercooling liquids.

Original languageEnglish (US)
Pages (from-to)27-31
Number of pages5
JournalThermochimica Acta
Volume486
Issue number1-2
DOIs
StatePublished - Mar 20 2009

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Keywords

  • Alkali nitrate
  • Solid state calorimetry
  • λ-Transition

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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