| Инд. авторы: | Goryainov S.V., Secco R.A., Huang Y., Likhacheva A.Y. |
| Заглавие: | Pressure-induced ionic conductivity of overhydrated zeolite NaA at different water/zeolite ratios |
| Библ. ссылка: | Goryainov S.V., Secco R.A., Huang Y., Likhacheva A.Y. Pressure-induced ionic conductivity of overhydrated zeolite NaA at different water/zeolite ratios // Microporous and Mesoporous Materials. - 2013. - Vol.171. - P.125-130. - ISSN 1387-1811. - EISSN 1873-3093. |
| Внешние системы: | DOI: 10.1016/j.micromeso.2012.12.033; SCOPUS: 2-s2.0-84873284446; |
| Реферат: | eng: The pressure-induced anomalously high AC conductivity of zeolite NaA mixed with water was measured by impedance spectroscopy at various water/zeolite ratios. The conductivity reaches a maximum value at 0.9-1.4 GPa with increasing water content of up to 20 wt.% in NaA + water. The high ionic conductivity of NaA compressed in water is interpreted to result from cation diffusion in the quasi-liquid Na+-H2O intra-channel system enhanced by the filling of additional H2O sites. The pressure range of anomalously high AC conductivity in NaA enlarges towards higher pressures with decrease of the water/zeolite ratio. An abrupt drop in conductivity observed at P > 1.5 GPa appears to be associated with freezing of intra-channel water. After pressure release, the overhydrated state of the zeolite kept in a closed container can be preserved for a long time, providing abnormally high conductivity which is comparable with that of Na+ β-alumina. © 2013 Elsevier Inc. All rights reserved.
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| Ключевые слова: | Phase transitions; Ionic conduction; Alumina; Zeolite NaA; Pressure release; Pressure ranges; Impedance spectroscopy; High pressure; Ionic conductivity; Cation diffusion; Ac Conductivity; Abrupt drops; Phase transition; Overhydrated NaA zeolite; Ionic conduction; High pressure; High conductivity; |
| Издано: | 2013 |
| Физ. характеристика: | с.125-130 |