Phase transition between two anhydrous modifications of NaHSO4 mediated by heat and water

Christopher D. Zangmeister, Jeanne E. Pemberton

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4 Scopus citations


The phase transition between the two anhydrous modifications of NaHSO4 (α and β) was studied using Raman spectroscopy and differential scanning calorimetry. These measurements indicate that β-NaHSO4 is a metastable phase and readily undergoes phase transition to thermodynamically stable α-NaHSO4 with an exothermic enthalpy change of 3.5 kJ/mol. Both thermal (temperatures >434 K) and chemical (exposure to H2O) pathways were identified for this transition. The transition is irreversible, and α-NaHSO4 is an intermediate phase between β-NaHSO4 and NaHSO4·H2O. The possible mechanism of the phase transition is discussed.

Original languageEnglish (US)
Pages (from-to)1826-1831
Number of pages6
JournalJournal of Solid State Chemistry
Issue number6
StatePublished - Jun 2007


  • Differential scanning calorimetry
  • Phase transition
  • Raman spectroscopy
  • α-NaHSO
  • β-NaHSO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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