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Reversible hydration/dehydration and thermal expansion of euchlorine, ideally KNaCu3O(SO4)3

  • Oleg I. SiidraEmail author
  • Artem S. Borisov
  • Evgeniya A. Lukina
  • Wulf Depmeier
  • Natalia V. Platonova
  • Marie Colmont
  • Diana O. Nekrasova
Original Paper
  • 28 Downloads

Abstract

Anhydrous alkali copper sulfates constitute the most abundant group of mineral species from the Second Scoria Cone of the Great Tolbachik Fissure Eruption (1975–1976), a location being renowned for its great mineral diversity. Euchlorine, ideally KNaCu3O(SO4)3, is the prevalent mineral in the hot sulfate-rich zones of the fumaroles. In this work, its thermal expansion and hydration/dehydration behavior have been studied. The results of a structure refinement from new single-crystal diffraction data are also reported, and a description of the structure based on anion-centered coordination polyhedra is given. The strongly anisotropic character of the thermal expansion of euchlorine remains essentially unchanged up to its decomposition. The strongest α11 expansion is observed approximately perpendicular to the alkali interlayer of the structure, whereas the minimal α22 and α33 thermal expansion coefficients are parallel to the plane of {Cu3O(SO4)3}2− layers. Hydration experiments controlled by X-ray powder diffraction reveal a very complex behavior with multicomponent phase formation. Remarkably, upon heating stepwise dehydration occurs, whereby the complex mixture of hydrated sulfates gradually reverses and becomes again essentially single-phased anhydrous euchlorine.

Keywords

Euchlorine Sulfates X-ray diffraction Evolution of minerals Reversible hydration/dehydration Thermal expansion Exhalative minerals Tolbachik volcano. 

Notes

Acknowledgements

The authors thank Gerald Giester and Christian Lengauer for helpful suggestions which improved the manuscript. This work was financially supported by the Russian Science Foundation through the grant 16-17-10085. Technical support by the SPbSU X-ray Diffraction and Geomodel Resource Centers is gratefully acknowledged.

Supplementary material

269_2018_1011_MOESM1_ESM.pdf (3.8 mb)
Supplementary material 1 (PDF 3917 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of CrystallographySt. Petersburg State UniversitySt. PetersburgRussia
  2. 2.Nanomaterials Research Center, Kola Science CenterRussian Academy of SciencesMurmansk RegionRussia
  3. 3.Institut für Geowissenschaften der Universität KielKielGermany
  4. 4.X-ray Diffraction Resource Center, St. Petersburg State UniversitySt. PetersburgRussia
  5. 5.Unité de Catalyse et Chimie du Solide (UCCS)UMR 8181 CNRS, Université Lille 1 Sciences et TechnologiesVilleneuve d’ASCQFrance

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