Solid-state NMR investigation of synthetic phlogopite and lepidolite samples.,Magnetic Resonance in Chemistry

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Solid-state NMR investigation of synthetic phlogopite and lepidolite samples.
Magnetic Resonance in Chemistry ( IF 1.9 ) Pub Date : 2020-02-05 , DOI: 10.1002/mrc.4998
Lara Sulcek ₁ , Ramona Langner _{1,

2} , Ulrike Werner-Zwanziger _{3,

4} , Josef W Zwanziger _{3,

4} , Charlotte Martineau-Corcos _{5,

6} , Michael Fechtelkord ₁

Affiliation

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 MAS, MQMAS and 27 Al-27 Al double-quantum single-quantum (DQ-SQ) NMR experiments. Notably, 27 Al-27 Al DQ-SQ MAS 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.

中文翻译：

合成金云母和锂云母样品的固态 NMR 研究。

在目前的工作中，我们的目标是破译两种富铝合成材料的八面体和四面体片中的阳离子排序，即标称成分 K (Mg3-x Alx )[Al1+x Si3-x O10 ](OH )y F2-y 和锂云母系统中的三锂云母 - 具有组成 K (Lix Al3-x )[Al4-2x Si2x O10 ](OH)y F2-y 的锂云母，通过直接探测铝分布通过 27 Al 和 17 O MAS , MQMAS 和 27 Al-27 Al 双量子单量子 (DQ-SQ) NMR 实验。值得注意的是，在 9.34 和/或 20.00 T 处记录的 27 Al-27 Al DQ-SQ MAS NMR 光谱显示了片材内部或片材之间的 Al 物种的空间接近或避免。在这两种研究的矿物中，核磁共振数据的集合表明四面体片中的 [4] Al 优先占据八面体片中 [6] Al 附近的位置。

更新日期：2020-02-05

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