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.

中文翻译：

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丝光沸石结构和动力学的 23Na 和 27Al NMR 研究

27Al 和 23Na 核磁共振谱的温度依赖性和丝光沸石中的自旋-晶格弛豫已经在静态和魔角自旋状态下进行了研究。我们的数据表明，23Na 和 27Al 核的自旋-晶格弛豫主要受核四极矩与晶体电场梯度的相互作用控制，受丝光沸石通道中水分子的平移运动调节。在低于 200 K 的温度下，核自旋与顺磁性杂质的偶极相互作用成为 23Na 和 27Al 核的重要弛豫机制。