Structural variations of amorphous magnesium carbonate during nucleation, crystallization, and decomposition of nesquehonite MgCO3·3H2O

IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Physics and Chemistry of Minerals Pub Date : 2022-12-30 DOI:10.1007/s00269-022-01231-4
Gen-ichiro Yamamoto, Atsushi Kyono, Satoru Okada
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Abstract

Carbonate minerals are major contributors to carbon sequestration in geological deposits; however, their nature and behavior remain unclear. Amorphous magnesium carbonate (AMC) is formed as a precursor to crystalline magnesium carbonates and as a product of thermal decomposition of nesquehonite (NSQ). In this study, the AMCs formed during the crystallization and decomposition of NSQ were investigated using X-ray diffraction (XRD) and atomic pair distribution function (PDF) methods. An AMC with a hydromagnesite-like structure (AMC-I) was formed immediately after mixing MgCl2 and Na2CO3 solutions. After 5 min of stirring, no change was observed in the XRD pattern; however, the PDF pattern changed. This suggests that the medium-range ordered structure of AMC-I transformed into an intermediate structure (AMC-II) between AMC-I and NSQ. After 10 min of stirring, the AMC-II crystallized into NSQ. In the case of Rb2CO3, the AMC-II structure was formed immediately after the mixing of solutions and was stable for three days. AMC-II in the Rb2CO3 solution appeared to be in equilibrium with energetic local minima, indicating the existence of polyamorphism in AMC. When Cs2CO3 solution was used, the first precipitate had an AMC-I structure. By stirring for 5 min, the AMC-I was transformed to AMC-II, and after 10 min of stirring, a few quantities crystallized into NSQ. After three days, NSQ dissolved and transformed back into AMC-I. Thus, it is inferred that the crystallization of NSQ is significantly influenced by alkali cations in aqueous solutions. The AMC formed during the thermal decomposition also possesses the AMC-I structure.

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无定形碳酸镁在MgCO3·3H2O成核、结晶和分解过程中的结构变化
碳酸盐矿物是地质矿床固碳的主要贡献者;然而,它们的性质和行为尚不清楚。无定形碳酸镁(AMC)是结晶碳酸镁的前体,是无定形碳酸镁石(NSQ)热分解的产物。本研究采用x射线衍射(XRD)和原子对分布函数(PDF)方法研究了NSQ在结晶和分解过程中形成的amc。在MgCl2和Na2CO3溶液混合后,立即形成具有氢氧化镁样结构的AMC (AMC- i)。搅拌5 min后,XRD谱图没有变化;然而,PDF模式改变了。这表明AMC-I的中程有序结构转变为介于AMC-I和NSQ之间的中间结构(AMC-II)。搅拌10 min后,AMC-II结晶成NSQ。以Rb2CO3为例,溶液混合后立即形成AMC-II结构,并稳定3天。在Rb2CO3溶液中,AMC- ii处于平衡状态,存在能量局部极小值,表明AMC存在多变质作用。当使用Cs2CO3溶液时,第一个沉淀具有AMC-I结构。搅拌5min后,AMC-I转化为AMC-II,搅拌10min后少量结晶成NSQ。3天后,NSQ溶解并重新转化为AMC-I。由此推断,水溶液中碱阳离子对NSQ的结晶影响较大。热分解过程中形成的AMC也具有AMC- i结构。
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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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