辉钼矿的高压行为:单晶x射线衍射研究

IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Physics and Chemistry of Minerals Pub Date : 2022-06-29 DOI:10.1007/s00269-022-01205-6
Yurii V. Seryotkin
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引用次数: 0

摘要

采用金刚石砧池,以4:1乙醇:水混合物和石蜡为传压介质,用单晶x射线衍射研究了天然辉沸石|Ca4.00Na0.16 (H2O)32| [Al8.16Si27.84O72]在4.5 GPa高压下的高压(HP)行为。在高压下,星辉石的结构变化,特别是STI框架变形与富na静晶岩|Ca4.00Na1.47 (H2O)30| [Al9.47Si26.53O72]相似。静沸石和辉钼矿都经历了压力诱导水化,水分子首先占据部分空位,然后占据最初的空位。这两种矿物在行为上的一些差异是由于静止岩中Na+阳离子的存在。钠占据了10元环的位置,阻止水分子在环中心附近穿透。同时,在高压下,星辉石和静辉石都能填补8元环中最初的空位。压力诱导的变化,包括阳离子配位中H2O位点的减少和H2O分子总数的减少,在含钠的静晶石中没有在辉钼矿中明显。
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High-pressure behaviour of stellerite: single-crystal X-ray diffraction study

The high-pressure (HP) behavior of natural stellerite |Ca4.00Na0.16 (H2O)32| [Al8.16Si27.84O72] has been studied by single-crystal X-ray diffraction using a diamond-anvil cell under pressures up to 4.5 GPa, with a 4:1 ethanol:water mixture and paraffin as pressure-transmitting media. The changes in the structure of stellerite at high pressures, especially the STI framework deformation, are similar to those in Na-rich stilbite |Ca4.00Na1.47 (H2O)30| [Al9.47Si26.53O72]. Both stilbite and stellerite udergo pressure-induced hydration, in which H2O molecules first occupy partly vacant sites and then the initially vacant positions. Some difference in the behavior of the two minerals is due to the presence of Na+ cations in stilbite. Sodium occupies positions in the 10-membered ring and prevents H2O molecules from penetrating near the ring center. Meanwhile, both stellerite and stilbite can fill the initially vacant sites in the 8-membered ring at high pressures. The pressure-induced changes, including the reduction of H2O sites in the cation coordination and a total number of H2O molecules, are less significant in Na-bearing stilbite than in stellerite.

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来源期刊
Physics and Chemistry of Minerals
Physics and Chemistry of Minerals 地学-材料科学:综合
CiteScore
2.90
自引率
14.30%
发文量
43
审稿时长
3 months
期刊介绍: Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are: -Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.) -General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.) -Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.) -Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.) -Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems -Electron microscopy in support of physical and chemical studies -Computational methods in the study of the structure and properties of minerals -Mineral surfaces (experimental methods, structure and properties)
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