Superprotonic conductivity in β-Cs3(HSO4)2(Hx(P,S)O 4)

Sossina M. Haile*, Pamela M. Calkins, Dane Boysen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

73 Scopus citations


Investigations of the system CsHSO4-CsH2PO4 led to discovery of the new compound, β-Cs3(HSO4)2(Hx(P,S)O 4), with a superprotonic phase transition at 125°C. The room temperature structure of β-Cs3(HSO4)2(Hx(P,S)O 4) is related to that of α-Cs3(HSO4)2(H2PO4) and that of CsHSO4-II. It is unique, however, in that P and S occupy the same crystallographic position in the structure, and there is accordingly a variable H content and a partially occupied hydrogen bond. This leads to room temperature conductivity that is significantly higher than either of the two related compounds. The conductivity in the high temperature phase is comparable to that of CsHSO4-I. Furthermore, the transition exhibits a relatively large heat of 30 Jg-1 and some hysteresis. These are explained by probable disordering between S and P sites upon transition to the superprotonic state.

Original languageEnglish (US)
Pages (from-to)145-151
Number of pages7
JournalSolid State Ionics
Issue number1-4
StatePublished - May 1 1997


  • Disordered hydrogen bond network
  • Protonic conductivity
  • Superprotonic phase transition

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


Dive into the research topics of 'Superprotonic conductivity in β-Cs3(HSO4)2(Hx(P,S)O 4)'. Together they form a unique fingerprint.

Cite this