Examination of the superprotonic transition and dehydration behavior of Cs0.75Rb0.25H2PO4 by thermogravimetric and differential thermal analyses

Ayako Ikeda*, Sossina M. Haile

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The dehydration and the superprotonic transition behavior of Cs0.75Rb0.25H2PO4 have been investigated via thermogravimetry and differential thermal analysis. To enable measurements under the high water partial pressures required, a high humidity system (pH2O = 0.02-0.8 atm) capable of weight change detection at 0.7% resolution and thermal events with 0.01 °C resolution was assembled. It has been found that the superprotonic phase transition temperature of Cs0.75Rb0.25H2PO4 is 231 °C, slightly higher than that of CsH2PO4. In contrast, dehydration of Cs0.75Rb0.25H2PO4 under pH2O = 0.35 atm occurs at 265 °C, a somewhat lower temperature than that at which CsH2PO4 undergoes dehydration. Analysis of the temporal evolution of both transformations suggests a mechanism of continuous nucleation of the high temperature phase at a constant nucleation rate combined with three-dimensional growth.

Original languageEnglish (US)
Pages (from-to)193-196
Number of pages4
JournalSolid State Ionics
Issue number3-4
StatePublished - Feb 24 2010


  • Cesium dihydrogen phosphate
  • Cesium rubidium dihydrogen phosphate
  • Dehydration
  • Rubidium dihydrogen phosphate
  • Superprotonic transition
  • Thermogravimetric and differential thermal analysis

ASJC Scopus subject areas

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

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