Work

Incommensurately modulated structure of Zn$_4$Si$_2$O$_7$(OH)$_2$ ·H$_2$O at high pressure

Year: 2025

Type: article

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.

Source: Desy publication database (The Deutsches Elektronen-Synchrotron)

Authors: Gajda, Roman, Sławiński, Wojciech, Poręba, Tomasz, Parafiniuk, Jan, Mezouar, Mohamed, Dera, Przemysław, Wozniak, Krzysztof

Language: English

Topic: High-pressure geophysics and materials

Subfield: Geophysics

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W7073639946

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