Econ. Environ. Geol. 2009; 42(5): 509-512

Published online October 31, 2009

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Elastic Behavior of Zeolite Mesolite under Hydrostatic Pressure

Yongjae Lee1, Yongmoon Lee1, Dong-Hoon Seoung1 and Young-Nam Jang2*

1Department of Earth System Sciences, Yonsei University, Seoul 120-749, Korea
2Korea Institute of Geoscience and Mineral Resources, Daejeon, 305-350, Korea

Correspondence to :

Young-Nam Jang

crystal@rock25t.kigam.re.kr

Received: September 15, 2009; Accepted: October 19, 2009

Abstract

Powder diffraction patterns of the zeolite mesolite (Na5.33Ca5.33Al16Si24O80·21.33H2O), with a natrolite framework topology were measured as a function of pressure up to 5.0 GPa using a diamond-anvil cell and a 200 μm-focused monochromatic synchrotron X-ray. Under the hydrostatic conditions mediated by pore-penetrating alcohol and water mixture, the elastic behavior of mesolite is characterized by continuous volume expansion between ca. 0.5 and 1.5 GPa, which results from expansion in the ab-plane and contraction along the c-axis. Subsequent to this anomalous behavior, changes in the powder diffraction patterns suggest possible reentrant order-disorder transition. The ordered layers of sodium- and calcium-containing channels in a 1:2 ratio along the b-axis attribute to the 3bnatrolite cell below 1.5 GPa. When the volume expansion is completed above 1.5 GPa, such characteristic ordering reflections disappear and the bnatrolite cell persists with marginal volume contraction up to ca. 2.5 GPa. Further increase in pressure leads to progressive volume contraction and appears to generate another set of superlattice reflections in the 3cnatrolite cell. This suggests that mesolite in the pressureinduced hydration state experiences order-disorder-order transition involving the motions of sodium and calcium cations
either through cross-channel diffusion or within the respective channels.

Keywords zeolite, mesolite, high-pressure, X-ray diffraction

Article

Econ. Environ. Geol. 2009; 42(5): 509-512

Published online October 31, 2009

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Elastic Behavior of Zeolite Mesolite under Hydrostatic Pressure

Yongjae Lee1, Yongmoon Lee1, Dong-Hoon Seoung1 and Young-Nam Jang2*

1Department of Earth System Sciences, Yonsei University, Seoul 120-749, Korea
2Korea Institute of Geoscience and Mineral Resources, Daejeon, 305-350, Korea

Correspondence to:

Young-Nam Jang

crystal@rock25t.kigam.re.kr

Received: September 15, 2009; Accepted: October 19, 2009

Abstract

Powder diffraction patterns of the zeolite mesolite (Na5.33Ca5.33Al16Si24O80·21.33H2O), with a natrolite framework topology were measured as a function of pressure up to 5.0 GPa using a diamond-anvil cell and a 200 μm-focused monochromatic synchrotron X-ray. Under the hydrostatic conditions mediated by pore-penetrating alcohol and water mixture, the elastic behavior of mesolite is characterized by continuous volume expansion between ca. 0.5 and 1.5 GPa, which results from expansion in the ab-plane and contraction along the c-axis. Subsequent to this anomalous behavior, changes in the powder diffraction patterns suggest possible reentrant order-disorder transition. The ordered layers of sodium- and calcium-containing channels in a 1:2 ratio along the b-axis attribute to the 3bnatrolite cell below 1.5 GPa. When the volume expansion is completed above 1.5 GPa, such characteristic ordering reflections disappear and the bnatrolite cell persists with marginal volume contraction up to ca. 2.5 GPa. Further increase in pressure leads to progressive volume contraction and appears to generate another set of superlattice reflections in the 3cnatrolite cell. This suggests that mesolite in the pressureinduced hydration state experiences order-disorder-order transition involving the motions of sodium and calcium cations
either through cross-channel diffusion or within the respective channels.

Keywords zeolite, mesolite, high-pressure, X-ray diffraction

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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