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Solid‐state nuclear magnetic resonance investigation of synthetic phlogopite and lepidolite samples
Author(s) -
Sulcek Lara,
Langner Ramona,
WernerZwanziger Ulrike,
Zwanziger Josef W.,
MartineauCorcos Charlotte,
Fechtelkord Michael
Publication year - 2020
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4998
Subject(s) - magic angle spinning , chemistry , octahedron , crystallography , solid state nuclear magnetic resonance , tetrahedron , magic angle , nuclear magnetic resonance , nuclear magnetic resonance spectroscopy , stereochemistry , physics , crystal structure
In the present work, our aim is to decipher the cationic ordering in the octahedral and tetrahedral sheets of two Al‐rich synthetic materials, namely, phlogopites of nominal composition K(Mg 3‐x Al x )[Al 1+x Si 3‐x O 10 ](OH) y F 2‐y and lepidolites in the system trilithionite–polylithionite with composition K (Li x Al 3‐x )[Al 4‐2x Si 2x O 10 ](OH) y F 2‐y , by directly probing the aluminium distribution through 27 Al and 17 O magic‐angle spinning, multiple‐quantum magic‐angle spinning, and 27 Al‐ 27 Al double‐quantum single‐quantum nuclear magnetic resonance (NMR) experiments. Notably, 27 Al‐ 27 Al double‐quantum single‐quantum magic‐angle spinning NMR spectra, recorded at 9.34 and/or 20.00 T, show the spatial proximity or avoidance of the Al species inside or between the sheets. In both studied minerals, the ensemble of NMR data suggests a preference for [4] Al in the tetrahedral sheet to occupy position close to the [6] Al of the octahedral sheets.