²³Na and ²⁷Al NMR Study of Structure and Dynamics in Mordenite

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• 作者：N. A. Sergeev ; M. Paczwa ; M. Olszewski ; A. M. Panich
• 刊名：Applied Magnetic Resonance
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：48
• 期：2
• 页码：115-124
• 全文大小：555KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Solid State Physics; Spectroscopy/Spectrometry; Atoms and Molecules in Strong Fields, Laser Matter Interaction; Physical Chemistry; Organic Chemistry;
• 出版者：Springer Vienna
• ISSN：1613-7507
• 卷排序：48

文摘

Temperature dependencies of 27Al and 23Na nuclear magnetic resonance spectra and spin–lattice relaxations in mordenite have been studied in static and magic angle spinning regimes. Our data show that the spin–lattice relaxations of the 23Na and 27Al nuclei are mainly governed by interaction of nuclear quadrupole moments with electric field gradients of the crystal, modulated by translational motion of water molecules in the mordenite channels. At temperatures below 200 K, the dipolar interaction of nuclear spins with paramagnetic impurities becomes an important relaxation mechanism of the 23Na and 27Al nuclei.