The crystal structure of nesquehonite, MgCO 3 · 3H 2 O, from Lavrion, Greece

Giester, Gerald; Lengauer, Christian L.; Rieck, Branko

doi:10.1007/s007100070001

Cited by 72 publications

(69 citation statements)

References 10 publications

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“…Some contention arises about the structure of nesquehonite because partial structural information, for example, derived from FTIR patterns, has been interpreted in terms of bonding and purport to show that "water" in nesquehonite is present partly as a mixture of molecular water and OH groups Frost and Palmer, 2011;Hopkinson et al, 2012). However, the X-ray crystal structure shows unequivocally that species such as HCO 3 − and OH − are absent: the correct picture is that all protons are combined as water in nesquehonite (Stephan and MacGillavry, 1972;Giester et al, 2000). The binding state of the "water" in the phases is important as it affects their subsequent evolution in the course of thermal treatment and enables control over the development of cementitious properties: so far, only nesquehonite (i.e., an MHCH phase containing only molecular water) was found to develop cementitious properties when treated, as described above.…”

Section: Mhch Phasesmentioning

confidence: 99%

Sequestering CO2 by Mineralization into Useful Nesquehonite-Based Products

et al. 2016

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The precipitation of magnesium hydroxy-carbonate hydrates has been suggested as a route to sequester CO2 into solids. We report the development of self-cementing compositions based on nesquehonite, MgCO3⋅3H2O, that are made from CO2-containing gas streams, the CO2 being separated from other gases by its high solubility in alkaline water, while magnesium is typically provided by waste desalination brines. Precipitation conditions are adjusted to optimize the formation of nesquehonite and the crystalline solid can readily be washed free of chloride. Products can be prepared to achieve self-cementation following two routes: (i) thermal activation of the nesquehonite then rehydration of the precursor or (ii) direct curing of a slurry of nesquehonite. The products thus obtained contain ~30 wt% CO2 and could form the basis for a new generation of lightweight, thermally insulating boards, blocks, and panels, with sufficient strength for general construction.

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Section: Mhch Phasesmentioning

confidence: 99%

Sequestering CO2 by Mineralization into Useful Nesquehonite-Based Products

et al. 2016

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“…[22] In nesquehonite, MgCO 3 ·3H 2 O bidentate coordinating carbonate ions are apparent due to the lower hydrate water content. [23] Basic, divalent metal carbonates like Ni 12 (CO 3 ) 8 (OH) 8 ·(5-7)H 2 O [19] or rosasite-type minerals, M 2 CO 3 (OH) 2 (M = Mg, Fe, Ni, Cu, Zn), [7,24,25] exhibit monodentate coordinating carbonate ions linking three, edge sharing MO 6 octahedra, that build up 3D networks. Ikaite (CaCO 3 ·6H 2 O) contains a comparable amount of hydrate water, but the cations are surrounded by six water molecules and a bidentate coordinating carbonate unit.…”

Section: Atomic Structure and Phase Compositionmentioning

confidence: 99%

Crystal Structure and Hydrate Water Content of Synthetic Hellyerite, NiCO₃·5.5H₂O

Bette

Rincke

Dinnebiér

et al. 2016

Zeitschrift anorg allge chemie

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Abstract.A sample of pure, artificial hellyerite was synthesized in aqueous solution at 0°C. The recorded X-ray diffraction pattern completely agrees with the reference data given for natural hellyerite. Laboratory high resolution X-ray powder diffraction, applying global optimization methods and Rietveld refinement, was employed to solve the crystal structure. Synthetic hellyerite was determined to crystallize in the primitive monoclinic space group P2/m (no. 10) with a =

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“…A better understanding of the global masses of Mg and CO 2 and the thermal stability of the hydrated carbonates of magnesium provides a practical understanding of carbon dioxide removal. From a practical point of view, the exact knowledge of the reaction path in MgO-CO 2 -H 2 O system is of great significance to the performance of Mg(OH) 2 and related minerals for greenhouse gas removal. The reaction path involving carbonation of brucite (Mg(OH) 2 ) is particularly complex, as Mg has a strong tendency to form a series of metastable hydrous carbonates.…”

Section: Sequestration Of Greenhouse Gasesmentioning

confidence: 99%

Thermo‐Raman spectroscopy of synthetic nesquehonite — implication for the geosequestration of greenhouse gases

Hales

Frost

Martens

2008

J Raman Spectroscopy

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Pure nesquehonite (MgCO 3 ·3H 2 O)/Mg(HCO 3 )(OH)·2H 2 O was synthesised and characterised by a combination of thermo-Raman spectroscopy and thermogravimetry with evolved gas analysis. ThermoRaman spectroscopy shows an intense band at 1098 cm −1 , which shifts to 1105 cm −1 at 450°C, assigned to the n 1 CO 3 2− symmetric stretching mode. Two bands at 1419 and 1509 cm −1 assigned to the n 3 antisymmetric stretching mode shift to 1434 and 1504 cm −1 at 175°C. Two new peaks at 1385 and 1405 cm −1 observed at temperatures higher than 175°C are assigned to the antisymmetric stretching modes of the (HCO 3 ) − units. Throughout all the thermo-Raman spectra, a band at 3550 cm −1 is attributed to the stretching vibration of OH units. Raman bands at 3124, 3295 and 3423 cm −1 are assigned to water stretching vibrations. The intensity of these bands is lost by 175°C. The Raman spectra were in harmony with the thermal analysis data. This research has defined the thermal stability of one of the hydrous carbonates, namely nesquehonite. Thermo-Raman spectroscopy enables the thermal stability of the mineral nesquehonite to be defined, and, further, the changes in the formula of nesquehonite with temperature change can be defined. Indeed, Raman spectroscopy enables the formula of nesquehonite to be better defined as Mg(OH)(HCO 3 )·2H 2 O.

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The crystal structure of nesquehonite, MgCO 3 · 3H 2 O, from Lavrion, Greece

Cited by 72 publications

References 10 publications

Sequestering CO2 by Mineralization into Useful Nesquehonite-Based Products

Sequestering CO2 by Mineralization into Useful Nesquehonite-Based Products

Crystal Structure and Hydrate Water Content of Synthetic Hellyerite, NiCO₃·5.5H₂O

Thermo‐Raman spectroscopy of synthetic nesquehonite — implication for the geosequestration of greenhouse gases

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The crystal structure of nesquehonite, MgCO 3 · 3H 2 O, from Lavrion, Greece

Cited by 72 publications

References 10 publications

Sequestering CO2 by Mineralization into Useful Nesquehonite-Based Products

Sequestering CO2 by Mineralization into Useful Nesquehonite-Based Products

Crystal Structure and Hydrate Water Content of Synthetic Hellyerite, NiCO3·5.5H2O

Thermo‐Raman spectroscopy of synthetic nesquehonite — implication for the geosequestration of greenhouse gases

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About

Crystal Structure and Hydrate Water Content of Synthetic Hellyerite, NiCO₃·5.5H₂O