Proton (deuteron) conductivity in Cs1.5Li1.5H(SO4)2 and Cs1.5Li1.5D(SO4)2 single crystals

B. V. Merinov*, C. R I Chisholm, D. A. Boysen, S. M. Haile

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations

Abstract

Calorimetric (DSC), NMR and electrical studies of Cs1.5Li1.5X(SO4)2 (X = H, D) single crystals have been performed in the temperature range from 300 to 533 K. No phase transitions are observed upon heating and the conductivity follows an Arrhenius temperature dependence to the point of decomposition at ∼ 470 K. Despite the high protonic conductivity of Cs1.5Li1.5X(SO4)2 (σ ∼ 10-3 S cm-1) at high temperature, these compounds cannot be classified as superprotonic because of the large value of the activation energy (Ea ∼ 1 eV). The proton NMR studies confirmed that two crystallographic proton sites exist in Cs1.5Li1.5H(SO4)2, presumably corresponding to two minima in the single, crystallographically distinct (and asymmetric) hydrogen bond. A measurable isotope effect in the conductivity data confirmed that protons/deuterons, as opposed to lithium ions, are the mobile species. The high activation energy for proton transport in Cs1.5Li1.5X(SO4)2 most probably results from the asymmetry of the hydrogen bonds, and from electrostatic repulsion between the protons and the Li+ ions which likely hinders reorientation of XSO4 - groups.

Original languageEnglish (US)
Pages (from-to)185-189
Number of pages5
JournalSolid State Ionics
Volume145
Issue number1-4
DOIs
StatePublished - Dec 1 2001
Event10th International Conference on Solid State (SSPC10) - Montpellier, France
Duration: Sep 24 2000Sep 28 2000

Keywords

  • CsH(SO)
  • CsHSO
  • CsLiH(SO)
  • Proton conductivity

ASJC Scopus subject areas

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

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