Journal Article

PUBDB-2025-00907

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Incommensurately modulated structure of Zn$_4$Si$_2$O$_7$(OH)$_2$ ·H$_2$O at high pressure

Gajda, R. (Corresponding author)Extern* ; Sławiński, W. ; Poręba, T. ; Parafiniuk, J. ; Mezouar, M.Extern* ; Dera, P. ; Wozniak, K. (Corresponding author)Extern*

2025
IUCr Chester

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Please use a persistent id in citations: doi:10.1107/S2052252524011060  doi:10.3204/PUBDB-2025-00907

Abstract: High-resolution single-crystal X-ray diffraction experiments on Zn$_4$Si$_2$O$_7$(OH)$_2$ ·H$_2$O hemimorphite were conducted at high pressure using diamond anvil cells at several different synchrotron facilities (ESRF, Elettra, DESY). Experimental data confirmed the existence of a previously reported phase transition and revealed the exact nature of the incommensurate modulation. We report the incommensurately modulated structure described in the (3+1)D space group Pnn2(0, β, 0)000. We have determined the modulation mechanism, which involves the fluctuation of atoms between two main positions, occurring mainly along the [100] direction, perpendicular to the modulation vector. Moreover, our results reveal that the phase transition occurs at lower pressure than previously reported.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20220925 EC (I-20220925-EC) (I-20220925-EC)
3. FS-Proposal: I-20230281 (I-20230281) (I-20230281)

Experiment(s):

1. PETRA Beamline P24 (PETRA III)

Appears in the scientific report 2025

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