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Article

Crystal Chemistry and High-Temperature Behaviour of Ammonium Phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the Burned Dumps of the Chelyabinsk Coal Basin

1
Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, University Emb. 7/9, 199034 Saint-Petersburg, Russia
2
Institute of Volcanology and Seismology FEB RAS, Piip Blvd 9, 683006 Petropavlovsk-Kamchatsky, Russia
3
South Urals Federal Research Center of Mineralogy and Geoecology of UB RAS, 456317 Miass, Russia
4
Geomodel Research Centre, St. Petersburg State University, University Emb. 7/9, 199034 Saint-Petersburg, Russia
5
Federal Research Center, Kola Science Center, RAS, Fersmana Str. 14, 184209 Apatity, Russia
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(8), 486; https://doi.org/10.3390/min9080486
Received: 30 July 2019 / Revised: 10 August 2019 / Accepted: 12 August 2019 / Published: 14 August 2019
The technogenic mineral phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the burned dumps of the Chelyabinsk coal basin have been investigated by single-crystal X-ray diffraction, scanning electron microscopy and high-temperature powder X-ray diffraction. The NH4MgCl3·6H2O phase is monoclinic, space group C2/c, unit cell parameters a = 9.3091(9), b = 9.5353(7), c = 13.2941(12) Å, β = 90.089(8)° and V = 1180.05(18) Å3. The crystal structure of NH4MgCl3·6H2O was refined to R1 = 0.078 (wR2 = 0.185) on the basis of 1678 unique reflections. The (NH4)2Fe3+Cl5·H2O phase is orthorhombic, space group Pnma, unit cell parameters a = 13.725(2), b = 9.9365(16), c = 7.0370(11) Å and V = 959.7(3) Å3. The crystal structure of (NH4)2Fe3+Cl5·H2O was refined to R1 = 0.023 (wR2 = 0.066) on the basis of 2256 unique reflections. NH4MgCl3·6H2O is stable up to 90 °C and then transforms to the less hydrated phase isotypic to β-Rb(MnCl3)(H2O)2 (i.e., NH4MgCl3·2H2O), the latter phase being stable up to 150 °C. (NH4)2Fe3+Cl5·H2O is stable up to 120 °C and then transforms to an X-ray amorphous phase. Hydrogen bonds provide an important linkage between the main structural units and play the key role in determining structural stability and physical properties of the studied phases. The mineral phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O are isostructural with natural minerals novograblenovite and kremersite, respectively. View Full-Text
Keywords: ammonium phases; novograblenovite; kremersite; Chelyabinsk coal basin; burned dumps; technogenic (anthropogenic) mineralogy; hydrogen bonds ammonium phases; novograblenovite; kremersite; Chelyabinsk coal basin; burned dumps; technogenic (anthropogenic) mineralogy; hydrogen bonds
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MDPI and ACS Style

Zolotarev, A.A., Jr.; Zhitova, E.S.; Krzhizhanovskaya, M.G.; Rassomakhin, M.A.; Shilovskikh, V.V.; Krivovichev, S.V. Crystal Chemistry and High-Temperature Behaviour of Ammonium Phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the Burned Dumps of the Chelyabinsk Coal Basin. Minerals 2019, 9, 486. https://doi.org/10.3390/min9080486

AMA Style

Zolotarev AA Jr., Zhitova ES, Krzhizhanovskaya MG, Rassomakhin MA, Shilovskikh VV, Krivovichev SV. Crystal Chemistry and High-Temperature Behaviour of Ammonium Phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the Burned Dumps of the Chelyabinsk Coal Basin. Minerals. 2019; 9(8):486. https://doi.org/10.3390/min9080486

Chicago/Turabian Style

Zolotarev, Andrey A., Jr., Elena S. Zhitova, Maria G. Krzhizhanovskaya, Mikhail A. Rassomakhin, Vladimir V. Shilovskikh, and Sergey V. Krivovichev 2019. "Crystal Chemistry and High-Temperature Behaviour of Ammonium Phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the Burned Dumps of the Chelyabinsk Coal Basin" Minerals 9, no. 8: 486. https://doi.org/10.3390/min9080486

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