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The temperature dependences of nuclear magnetic resonance (NMR) and magic angle spinning (MAS) NMR spectra of  23 Na nuclei in natrolite (Na 2 Al 2 Si 3 O 10 ·2H 2 O) have been studied. The temperature dependences of the spin-lattice relaxation times T 1  in natrolite have also been studied. It has been shown that the spin-lattice relaxation of the  23 Na is governed by the electric quadrupole interaction with the crystal electric field gradients modulated by translational motion of H 2 O molecules in the natrolite pores. The dipolar interactions with paramagnetic impurities become significant as a relaxation mechanism of the  23 Na nuclei only at low temperature (&lt;270 K).

23 Na Nuclear Magnetic Resonance Study of the Structure and Dynamic of Natrolite