Abstract
The mobility of water molecules in natural natrolite (Na2Al2Si3O10∙2H2O) is investigated by the 1H NMR method. The spin-lattice relaxation times in the laboratory and rotating frames (T 1 and T 1ρ) are measured as a function of the temperature for a polycrystalline sample. From experimental T 1 data it follows that at T > 286 K the diffusion of water molecules along channels parallel to the c axis is observed. From experimental T 1ρ data it follows that at T > 250 K the diffusion of water molecules in transversal channels of natrolite is also observed. At a low temperature (T < 250 K) the dipolar interaction with paramagnetic impurities (presumably Fe3+ ions) becomes significant as a relaxation mechanism of 1H nuclei.
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Dedicated to Prof. S.P. Gabuda on the occasion of his 80th birthday
The text was submitted by the authors in English. Zhurnal Strukturnoi Khimii, Vol. 57, No. 2, pp. 335-340, March-April, 2016.
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Paczwa, M., Sapiga, A.A., Olszewski, M. et al. Spin-lattice relaxations study of water mobility in natural natrolite. J Struct Chem 57, 319–324 (2016). https://doi.org/10.1134/S0022476616020116
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DOI: https://doi.org/10.1134/S0022476616020116