TY - JOUR

T1 - Crystal–fluid interaction

T2 - the evolution of stilbite structure at high pressure

AU - Seryotkin, Yu V.

AU - Dementiev, S. N.

AU - Likhacheva, A. Yu

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. Publisher Copyright: © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/1

Y1 - 2021/1

N2 - Natural stilbite, Ca4.00Na1.47(H2O)30[Al9.47Si26.53O72], space group F2/m, a = 13.5978(3), b = 18.2804(4), c = 17.8076(4) Å, β = 90.685(2)°, V = 4426.18(17) Å3, Z = 2, has been studied by single-crystal X-ray diffraction method at ambient conditions and under compression in penetrating (water-bearing) and non-penetrating (paraffin) media. In water-containing medium during the first compression stage (below 1 GPa) the pressure-induced hydration effect manifests in the additional occupation of partly vacant H2O positions; above 1 GPa the H2O position, which is vacant at ambient pressure and not linked to cations, becomes occupied. Above 2.6 GPa the composition of stilbite remains almost constant; apparently no further hydration is possible. The compressibility of stilbite in paraffin is expectedly higher compared to that in penetrating medium. The cations coordination changes mainly through minor shifts of water positions and some re-distribution of their occupancy. Above 3 GPa the structure abruptly contracts along the b axis; the structure symmetry is reduced to triclinic. The decompression experiments show full reversibility of structural changes on pressure release.

AB - Natural stilbite, Ca4.00Na1.47(H2O)30[Al9.47Si26.53O72], space group F2/m, a = 13.5978(3), b = 18.2804(4), c = 17.8076(4) Å, β = 90.685(2)°, V = 4426.18(17) Å3, Z = 2, has been studied by single-crystal X-ray diffraction method at ambient conditions and under compression in penetrating (water-bearing) and non-penetrating (paraffin) media. In water-containing medium during the first compression stage (below 1 GPa) the pressure-induced hydration effect manifests in the additional occupation of partly vacant H2O positions; above 1 GPa the H2O position, which is vacant at ambient pressure and not linked to cations, becomes occupied. Above 2.6 GPa the composition of stilbite remains almost constant; apparently no further hydration is possible. The compressibility of stilbite in paraffin is expectedly higher compared to that in penetrating medium. The cations coordination changes mainly through minor shifts of water positions and some re-distribution of their occupancy. Above 3 GPa the structure abruptly contracts along the b axis; the structure symmetry is reduced to triclinic. The decompression experiments show full reversibility of structural changes on pressure release.

KW - Crystal–fluid interaction

KW - High pressure

KW - Single-crystal X-ray diffraction

KW - Stilbite

KW - Structure evolution

KW - Crystal-fluid interaction

UR - http://www.scopus.com/inward/record.url?scp=85099306908&partnerID=8YFLogxK

U2 - 10.1007/s00269-020-01131-5

DO - 10.1007/s00269-020-01131-5

M3 - Article

AN - SCOPUS:85099306908

VL - 48

JO - Physics and Chemistry of Minerals

JF - Physics and Chemistry of Minerals

SN - 0342-1791

IS - 1

M1 - 4

ER -