TY - JOUR

T1 - High-pressure behaviour of stellerite: single-crystal X-ray diffraction study

AU - Seryotkin, Yurii V.

N1 - Funding Information: This study was supported by the Russian Foundation of Basic Researches (Grant 19-05-00800) and by state assignment of IGM SB RAS. X-ray experiments were done using the equipment of Research and Education Centre “Molecular Design and Ecologically Safe Technologies” at NSU. Publisher Copyright: © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

PY - 2022/7

Y1 - 2022/7

N2 - The high-pressure (HP) behavior of natural stellerite |Ca4.00Na0.16 (H2O)32| [Al8.16Si27.84O72] has been studied by single-crystal X-ray diffraction using a diamond-anvil cell under pressures up to 4.5 GPa, with a 4:1 ethanol:water mixture and paraffin as pressure-transmitting media. The changes in the structure of stellerite at high pressures, especially the STI framework deformation, are similar to those in Na-rich stilbite |Ca4.00Na1.47 (H2O)30| [Al9.47Si26.53O72]. Both stilbite and stellerite udergo pressure-induced hydration, in which H2O molecules first occupy partly vacant sites and then the initially vacant positions. Some difference in the behavior of the two minerals is due to the presence of Na+ cations in stilbite. Sodium occupies positions in the 10-membered ring and prevents H2O molecules from penetrating near the ring center. Meanwhile, both stellerite and stilbite can fill the initially vacant sites in the 8-membered ring at high pressures. The pressure-induced changes, including the reduction of H2O sites in the cation coordination and a total number of H2O molecules, are less significant in Na-bearing stilbite than in stellerite.

AB - The high-pressure (HP) behavior of natural stellerite |Ca4.00Na0.16 (H2O)32| [Al8.16Si27.84O72] has been studied by single-crystal X-ray diffraction using a diamond-anvil cell under pressures up to 4.5 GPa, with a 4:1 ethanol:water mixture and paraffin as pressure-transmitting media. The changes in the structure of stellerite at high pressures, especially the STI framework deformation, are similar to those in Na-rich stilbite |Ca4.00Na1.47 (H2O)30| [Al9.47Si26.53O72]. Both stilbite and stellerite udergo pressure-induced hydration, in which H2O molecules first occupy partly vacant sites and then the initially vacant positions. Some difference in the behavior of the two minerals is due to the presence of Na+ cations in stilbite. Sodium occupies positions in the 10-membered ring and prevents H2O molecules from penetrating near the ring center. Meanwhile, both stellerite and stilbite can fill the initially vacant sites in the 8-membered ring at high pressures. The pressure-induced changes, including the reduction of H2O sites in the cation coordination and a total number of H2O molecules, are less significant in Na-bearing stilbite than in stellerite.

KW - Compressibility

KW - Crystal structure

KW - High pressure

KW - Pressure-induced hydration

KW - Single-crystal X-ray diffraction

KW - Stellerite

KW - Stilbite

KW - Zeolite

UR - http://www.scopus.com/inward/record.url?scp=85133104454&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/e08f3be6-8357-31ed-a610-c99339b5aafd/

U2 - 10.1007/s00269-022-01205-6

DO - 10.1007/s00269-022-01205-6

M3 - Article

AN - SCOPUS:85133104454

VL - 49

JO - Physics and Chemistry of Minerals

JF - Physics and Chemistry of Minerals

SN - 0342-1791

IS - 7

M1 - 25

ER -