Conductivity and real structure of cesium hydrosulphosphate crystals

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Abstract

Superproton crystals obtained in the water-salt system CsHSO4–CsH2PO4–H2O were studied using electric atomic force microscopy. At 296 K for the Cs3(HSO4)2(H2PO4) and Cs4(HSO4)3(H2PO4) samples, local current-voltage characteristics were measured depending on the crystallographic orientation, the anisotropy of conductivity was established, and the degree of dependence of the conductive properties on the composition of the compounds was shown. Twin structures on cleavage fractures and their correlation with the atomic structure of monoclinic crystals are considered. The common features and differences in the atomic and real structure of mixed crystalline phases and the influence of hydrogen subsystems on their properties are discussed.

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About the authors

R. V. Gainutdinov

Shubnikov Institute of Crystallography of Kurchatov complex “Crystallography and photonics” of NRC “Kurchatov institute”

Email: alla@crys.ras.ru
Russian Federation, 119333 Moscow

A. L. Tolstikhina

Shubnikov Institute of Crystallography of Kurchatov complex “Crystallography and photonics” of NRC “Kurchatov institute”

Author for correspondence.
Email: alla@crys.ras.ru
Russian Federation, 119333 Moscow

I. P. Makarova

Shubnikov Institute of Crystallography of Kurchatov complex “Crystallography and photonics” of NRC “Kurchatov institute”

Email: alla@crys.ras.ru
Russian Federation, 119333 Moscow

V. A. Komornikova

Shubnikov Institute of Crystallography of Kurchatov complex “Crystallography and photonics” of NRC “Kurchatov institute”

Email: alla@crys.ras.ru
Russian Federation, 119333 Moscow

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Supplementary files

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2. Fig. 1. Crystal Cs3(HSO4)2(H2PO4): atomic structure at room temperature (a); arrangement of SO4 and PO4 groups in a layer perpendicular to the a axis, when cleaved along the direction shown by the arrows (b).

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3. Fig. 2. CVC of samples: a – Cs3(HSO4)2(H2PO4), b – Cs4(HSO4)3(H2PO4), recorded at 296 K parallel (1) and perpendicular (2) to the a axis.

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4. Fig. 3. AFM images of the surface of Cs3(HSO4)2(H2PO4) (a, c, d, e) and Cs4(HSO4)3(H2PO4) (b, d) samples.

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