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• W2802602008 abstract "Ye’elimite is the principal component in calcium sulfoaluminate cement, which currently attracts significant attention, since it can be produced with lower CO2 emissions compared to conventional portland cement. The crystal structure of ye’elimite is not well-established, and it has been proposed to exhibit cubic, tetragonal, and orthorhombic structures. The present work reports a comprehensive 27Al magic-angle spinning (MAS) and multiple-quantum (MQ) MAS NMR study of ye’elimite, utilizing six magnetic fields from 4.7 to 22.3 T. These spectra are only compatible with the orthorhombic Pcc2 structure of ye’elimite, implying the presence of eight distinct AlO4 sites. The 27Al NMR spectra are convincingly simulated by eight distinct sites, and 27Al quadrupole coupling parameters and isotropic chemical shifts are reported for the first time for ye’elimite. These parameters are a prerequisite for a reliable interpretation and quantification of ye’elimite in 27Al NMR spectra of ye’elimite-based cements. Density functional theory (DFT) calculations are used in the assignment of the specific Al sites in ye’elimite. Structural relaxations by DFT, using two proposed Pcc2 structures as starting points, result virtually in the same set of optimized fractional atomic coordinates, which is proposed as a new refined structure for ye’elimite. The refined structure gives the best agreement between experimental and calculated 27Al quadrupole tensor elements for the eight Al sites. Finally, the 33S MAS NMR spectra for ye’elimite, monosulfate, and anhydrite are reported." @default.
• W2802602008 created "2018-05-17" @default.
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• W2802602008 date "2018-05-10" @default.
• W2802602008 modified "2023-09-27" @default.
• W2802602008 title "Structural Investigation of Ye’elimite, Ca₄Al₆O₁₂SO₄, by ²⁷Al MAS and MQMAS NMR at Different Magnetic Fields" @default.
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• W2802602008 doi "https://doi.org/10.1021/acs.jpcc.8b02497" @default.
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