NMR Study of Synthetic Gallosilicate Natrolite

Solid-state 29 Si and 71 Ga NMR was used to study the synthetic gallosilicate Na 16 Ga 16 Si 24 O 80 ·16H 2 O (Ga–natrolite). It has been shown that Ga–natrolite contains mainly Si(GaO 4 ) 3 (SiO 4 ) and Si(GaO 4 ) 2 (SiO 4 ) 2 -structural units and has sufficiently ordered structure. Temperature dependence of the spin–lattice relaxation time T 1 of 71 Ga nuclei has also been studied using solid-state NMR. Spin–lattice relaxation of the 71 Ga was determined to be governed by the electric quadrupole interaction with the crystal electric field gradients modulated by translational motion of H 2 O molecules in the Ga–natrolite pores.