Bulk and Surface Properties of Ionic Salt CsH5(PO4)2 Full article
Journal |
Solid State Ionics
ISSN: 0167-2738 |
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Output data | Year: 2006, Volume: 177, Number: 13-14, Pages: 1117-1122 Pages count : 6 DOI: 10.1016/j.ssi.2006.05.001 | ||||
Tags | CsH5(PO4)2, Infrared and Raman spectroscopy, Ionic conductors, Proton conductivity | ||||
Authors |
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Affiliations |
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Funding (1)
1 | Russian Foundation for Basic Research | 05-03-32278 |
Abstract:
We report a comparative study of transport and thermodynamic properties of single-crystal and polycrystalline samples of the ionic salt CsH5(PO4)2 possessing a peculiar three-dimensional hydrogen-bond network. The observed potential of electrolyte decomposition ≈ 1.3 V indicates that the main charge carriers in this salt are protons. However, in spite of the high proton concentration, the conductivity appears to be rather low with a high apparent activation energy Ea ≈ 2 eV, implying that protons are strongly bound. The transport anisotropy though is not large, correlates with the crystal structure: the highest conductivity is found in the [001] direction (σ130 °C ∼ 5.6 × 10− 6 S cm− 1) while the minimal conductivity is in the [100] direction (σ130 °C ∼ 10 −6 S cm− 1). The conductivity of polycrystalline samples appears to exceed the bulk one by 1–3 orders of magnitude with a concomitant decrease of the activation energy (Ea ≈ 1.05 eV), which indicates that a pseudo-liquid layer with a high proton mobility is formed at the surface of grains. Infrared and Raman spectroscopy used to study the dynamics of the hydrogen-bond system in single-crystal and polycrystalline samples have confirmed the formation of such a modified surface layer in the latter. However, no bulk phase transition into the superionic disordered phase is observed in CsH5(PO4)2 up to the melting point Tmelt ∼ 151.6 °C, in contrast to its closest relative compound CsH2PO4.
Cite:
Lavrova G.V.
, Burgina E.B.
, Matvienko A.A.
, Ponomareva V.G.
Bulk and Surface Properties of Ionic Salt CsH5(PO4)2
Solid State Ionics. 2006. V.177. N13-14. P.1117-1122. DOI: 10.1016/j.ssi.2006.05.001 WOS Scopus РИНЦ
Bulk and Surface Properties of Ionic Salt CsH5(PO4)2
Solid State Ionics. 2006. V.177. N13-14. P.1117-1122. DOI: 10.1016/j.ssi.2006.05.001 WOS Scopus РИНЦ
Dates:
Submitted: | Nov 1, 2005 |
Accepted: | May 1, 2006 |
Published print: | May 1, 2006 |
Published online: | Jun 6, 2006 |
Identifiers:
Web of science | WOS:000239318100003 |
Scopus | 2-s2.0-33745744800 |
Elibrary | 13515352 |
Chemical Abstracts | 2006:672479 |
Chemical Abstracts (print) | 146:16840 |
OpenAlex | W2082255312 |