NDLI: Ca2Mg(NO3)6×12H2O–structural investigations on a new compound retrieved from chimney deposits of a combined heat and power plant

Content Provider	Springer Nature Link
Author	Kahlenberg, Volker Tessadri, Richard Tribus, Martina Schmidmair, Daniela Perfler, Lukas Haefeker, Udo
Copyright Year	2014
Abstract	Phase analysis of incrustations retrieved from chimney deposits of a combined heat and power plant in Malchow/Germany by X-ray powder diffraction gave evidence for the existence of a previously unknown hydrous calcium magnesium nitrate. Optical investigations of the sample showed the presence of colorless platy crystals with a maximum diameter of about 250 μm embedded in a partly polycrystalline and partly glassy matrix. Aided by EDX-analysis and Raman spectroscopy, a single-crystal diffraction study performed at ambient conditions demonstrated that the material represents a phase with composition Ca2Mg(NO3)6×12H2O. Basic crystallographic data are as follows: trigonal symmetry, space group type R $$ \overline{3} $$ , a = 10.5583(5) Å, c = 19.5351(10) Å, V = 1885.97(16) Å3, Z = 3, (R(\|F\|) = 0.0248). The magnesium ions are coordinated by water molecules to form distorted Mg(H2O)6-octahedra. The calcium atoms are surrounded by nine ligands. The resulting CaO9 tricapped trigonal prisms involve oxygen atoms from additional water moieties as well as from three different bidentate nitrate groups, respectively. Hydrogen bonds link one octahedron with two adjacent prisms into trimers. The trimers in turn are stacked in columns running parallel to [001]. Further hydrogen bonding between neighboring columns results in the formation of a three-dimensional network. To our best knowledge, Ca2Mg(NO3)6×12H2O represents a new structure type. However, column-like topologies with rods consisting of different types of polyhedra have been also observed in other trigonal hydrous nitrates. The structural relationships between these compounds are discussed. It is interesting to note that in previous phase equilibrium studies on the ternary system Ca(NO3)2-Mg(NO3)2-H2O no other hydrous double salt has been described. Finally, the results of the structure analysis allowed a qualitative and quantitative phase analysis of the crystalline part of the chimney deposit by the Rietveld method.
Starting Page	633
Ending Page	643
Page Count	11
File Format	PDF
ISSN	09300708
Journal	Mineralogy and Petrology
Volume Number	108
Issue Number	5
e-ISSN	14381168
Language	English
Publisher	Springer Vienna
Publisher Date	2014-03-21
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mineralogy Inorganic Chemistry Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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