Incommensurately modulated structure of Zn4Si2O7(OH)2·H2O at high pressure

IF 2.9 2区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
IUCrJ Pub Date : 2025-01-01 DOI:10.1107/S2052252524011060
Roman Gajda , Wojciech Sławiński , Tomasz Poręba , Jan Parafiniuk , Mohamed Mezouar , Przemysław Dera , Krzysztof Woźniak
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引用次数: 0

Abstract

Refinement of the hemimorphite crystal structure using single-crystal synchrotron X-ray diffraction data collected at high pressure revealed a structural phase transition into an incommensurately modulated structure, accompanied by the appearance of satellite reflections.
High-resolution single-crystal X-ray diffraction experiments on Zn4Si2O7(OH)2·H2O 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.
高压下 Zn4Si2O7(OH)2-H2O 的非同调结构。
在几个不同的同步加速器设施(ESRF、Elettra、DESY)中,使用金刚石砧室在高压下对 Zn4Si2O7(OH)2-H2O 半晶进行了高分辨率单晶 X 射线衍射实验。实验数据证实了之前报道的相变的存在,并揭示了互不相称调制的确切性质。我们报告了在 (3+1)D 空间群 Pnn2(0, β, 0)000 中描述的非同调结构。我们确定了调制机制,它涉及原子在两个主要位置之间的波动,主要沿[100]方向发生,与调制矢量垂直。此外,我们的研究结果表明,相变发生的压力比以前报道的要低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
IUCrJ
IUCrJ CHEMISTRY, MULTIDISCIPLINARYCRYSTALLOGRAPH-CRYSTALLOGRAPHY
CiteScore
7.50
自引率
5.10%
发文量
95
审稿时长
10 weeks
期刊介绍: IUCrJ is a new fully open-access peer-reviewed journal from the International Union of Crystallography (IUCr). The journal will publish high-profile articles on all aspects of the sciences and technologies supported by the IUCr via its commissions, including emerging fields where structural results underpin the science reported in the article. Our aim is to make IUCrJ the natural home for high-quality structural science results. Chemists, biologists, physicists and material scientists will be actively encouraged to report their structural studies in IUCrJ.
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