Total understanding of the local structures of an amorphous slag: Perspective from multi-nuclear ( 29Si, 27Al, 17O, 25Mg, and 43Ca) solid-state NMR

Local environments of all constituent elements (Si, Al, O, Mg, and Ca) in an amorphous slag were examined using multi-nuclear solid-state NMR under high magnetic field (16.4 T). The amorphous slag framework structure can be generally described as a depolymerized, chain-like network of SiO 4 tetrahed...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2008-02, Vol.354 (10), p.1036-1043
Main Authors: Shimoda, Keiji, Tobu, Yasuhiro, Kanehashi, Koji, Nemoto, Takahiro, Saito, Koji
Format: Article
Language:English
Subjects:
Aluminosilicates
Condensed matter: structure, mechanical and thermal properties
Disordered solids
Exact sciences and technology
MAS-NMR
NMR
NQR
Nuclear magnetic (and quadrupole) resonance
Other amorphous solids
Physics
Short-range order
Slags
Structure of solids and liquids
crystallography
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Summary:Local environments of all constituent elements (Si, Al, O, Mg, and Ca) in an amorphous slag were examined using multi-nuclear solid-state NMR under high magnetic field (16.4 T). The amorphous slag framework structure can be generally described as a depolymerized, chain-like network of SiO 4 tetrahedra branched with AlO 4 tetrahedra. 17O multiple-quantum magic angle spinning (MQMAS) spectrum demonstrated that oxygens occupy structurally inequivalent sites, depending on their bonding nature. 25Mg and 43Ca MQMAS spectra also showed multi-site occupancy of the ions, and the average coordination numbers were estimated to about 6 and 7, respectively. Our results should underscore the impact of the high magnetic field NMR techniques, especially MQMAS, when applied to non-crystalline solids.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2007.08.010