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2020
Journal Article
Titel
Solid-state nuclear magnetic resonance investigation of synthetic phlogopite and lepidolite samples
Abstract
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(Mg3‐xAlx)[Al1+xSi3‐xO10](OH)yF2‐y and lepidolites in the system trilithionite-polylithionite with composition K (LixAl3‐x)[Al4‐2xSi2xO10](OH)yF2‐y, by directly probing the aluminium distribution through 27Al and 17O magic‐angle spinning, multiple‐quantum magic‐angle spinning, and 27Al‐27Al double‐quantum single‐quantum nuclear magnetic resonance (NMR) experiments. Notably, 27Al‐27Al 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.
Author(s)
Sulcek, Lara
Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Bochum, Germany
Werner-Zwanziger, Ulrike
Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada / Clean Technologies Research Institute, Dalhousie University, Halifax, Nova Scotia, Canada
Zwanziger, Josef W.
Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada / Clean Technologies Research Institute, Dalhousie University, Halifax, Nova Scotia, Canada
Martineau-Corcos, Charlotte
ILV, Université de Versailles St-Quentin en Yvelines, Université Paris-Saclay, Versailles, France / CEMHTI UPR CNRS 3079, Université d'Orléans, Orléans, France