Solid‐state nuclear magnetic resonance investigation of synthetic phlogopite and lepidolite samples. (5th February 2020)

• Record Type: Journal Article
• Authors: Sulcek, Lara; Langner, Ramona; Werner‐Zwanziger, Ulrike; Zwanziger, Josef W.; Martineau‐Corcos, Charlotte; Fechtelkord, Michael
• Other Names: Abraham Anuji guestEditor.; Krishnan Damodaran guestEditor.; Salager Elodie guestEditor.; Su Yongchao guestEditor.
• Is Part Of: Magnetic resonance in chemistry. Volume 58:Number 11(2020)
• Page Start: 1099
• Page End: 1108
• Publication Date: 2020-02-05
• Subjects: 17O MAS NMR -- 27Al MAS NMR -- cation ordering -- lepidolite -- phlogopite; Nuclear magnetic resonance spectroscopy -- Periodicals; Chemistry, Organic -- Periodicals; Magnetic resonance -- Periodicals; 538.36
• DOI: 10.1002/mrc.4998
• Languages: English
• ISSNs: 0749-1581

Abstract

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‐x Alx )[Al1+x Si3‐x O10 ](OH)y F2‐y and lepidolites in the system trilithionite–polylithionite with composition K (Lix Al3‐x )[Al4‐2x Si2x O10 ](OH)y F2‐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. Abstract : 27 Al and 17 O MAS and MQMAS along with 27 Al‐ 27 Al DQ‐SQ MAS NMR experiments are used to decipher the aluminium preferential ordering in phlogopite and lepidolite synthetic minerals.