Synthesis and high pressure stability of novel GaGeO3OH compound - Analog of phase egg AlSiO3OH

IF 4.3 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of Physics and Chemistry of Solids Pub Date : 2025-03-30 DOI:10.1016/j.jpcs.2025.112740

A.V. Spivak , A.V. Iskrina , T.V. Setkova , S.S. Khasanov , A.V. Kuzmin , E.S. Zakharchenko , P.S. Kvas , A.A. Viryus

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引用次数: 0

Abstract

Gallogermanates have attracted sufficient attention as a high-pressure model of silicate and aluminosilicate due to chemical deformation of the structure. Thus, the GaGeO₃OH compound can be considered as an analog of the phase Egg (AlSiO₃OH), which is known as a possible H₂O reservoir in the deep Earth's interior. We present a complex study (scanning electron microscopy, energy dispersive X-ray spectroscopy, powder X-ray diffraction, and Raman spectroscopy) on the synthetic GaGeO₃OH compound. For the first time, the GaGeO₃OH crystals (up to 10 μm in size) are synthesized at 7 GPa and 1000 °C. The unit cell parameters are: a = 7.5785(1), b = 4.4605(3), c = 7.2469(4) Å, β = 97.519(2) °, V = 242.87(02) Å³, space group P2₁/n. Using in situ Raman spectroscopy at high pressures, the dependence of the shift in the position of the main bands of the GaGeO₃OH Raman spectrum on the pressure was established. According to the data of Raman spectroscopy up to ⁓30 GPa, it was revealed that the GaGeO₃OH undergoes the possible structural changes at ⁓4 and ⁓ 14 GPa.

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新型GaGeO3OH化合物的合成及高压稳定性-相蛋AlSiO3OH类似物

低聚锗酸盐由于其结构的化学变形，作为硅酸盐和铝硅酸盐的高压模型引起了足够的关注。因此，GaGeO3OH化合物可以被认为是蛋相（AlSiO3OH）的类似物，蛋相被认为是地球深处可能的水储集层。我们对合成的GaGeO3OH化合物进行了复杂的研究（扫描电子显微镜，能量色散x射线光谱，粉末x射线衍射和拉曼光谱）。首次在7 GPa和1000℃条件下合成了尺寸达10 μm的GaGeO3OH晶体。晶胞参数:= 7.5785 (1),b = 4.4605 (3), c = 7.2469(4),β= 97.519(2)°,V = 242.87 (02) A3,空间群P21 / n。利用高压下的原位拉曼光谱，建立了GaGeO3OH拉曼光谱主谱带位置位移与压力的关系。根据⁓30 GPa的拉曼光谱数据，发现在⁓4和⁓14 GPa处，GaGeO3OH可能发生了结构变化。

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来源期刊

Journal of Physics and Chemistry of Solids 工程技术-化学综合

CiteScore

7.80

自引率

2.50%

发文量

605

审稿时长

40 days

期刊介绍： The Journal of Physics and Chemistry of Solids is a well-established international medium for publication of archival research in condensed matter and materials sciences. Areas of interest broadly include experimental and theoretical research on electronic, magnetic, spectroscopic and structural properties as well as the statistical mechanics and thermodynamics of materials. The focus is on gaining physical and chemical insight into the properties and potential applications of condensed matter systems. Within the broad scope of the journal, beyond regular contributions, the editors have identified submissions in the following areas of physics and chemistry of solids to be of special current interest to the journal: Low-dimensional systems Exotic states of quantum electron matter including topological phases Energy conversion and storage Interfaces, nanoparticles and catalysts.