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The deformation mechanism of a pressure-induced phase transition in dehydrated analcime

Published online by Cambridge University Press:  05 July 2018

A. Yu. Likhacheva ,
S. V. Rashchenko  and
Yu. V. Seryotkin
A. Yu. Likhacheva*
Affiliation:
Institute of Geology and Mineralogy SibD RAS, pr. ak. Koptyuga 3, 630090 Novosibirsk, Russia
S. V. Rashchenko
Affiliation:
Institute of Geology and Mineralogy SibD RAS, pr. ak. Koptyuga 3, 630090 Novosibirsk, Russia Novosibirsk State University, Pirogov st. 2, 630090 Novosibirsk, Russia
Yu. V. Seryotkin
Affiliation:
Institute of Geology and Mineralogy SibD RAS, pr. ak. Koptyuga 3, 630090 Novosibirsk, Russia Novosibirsk State University, Pirogov st. 2, 630090 Novosibirsk, Russia
*
*E-mail: [email protected]
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Abstract

The elastic and structural behaviour of dehydrated analcime in compression in a non-penetrating medium up to 3 GPa was studied in a diamond anvil cell using in situ synchrotron powder diffraction. A first-order phase transition at 0.4–0.7 GPa is accompanied by a symmetry change from monoclinic (I2/a) to pseudo-rhombohedral (R3) due to trigonalization of the aluminosilicate framework. This is due to the migration of cations to new positions close to the 6-membered rings forming the channels. The reduction of the mean aperture of the structure-forming 6- and 8-membered rings, as a result of tetrahedral tilting, leads to a 7.5% reduction in volume at the phase transition. The bulk modulus values are 38(2) GPa for the low pressure (LP) phase [fitted with a Murnaghan equation of state, K' = 4 (fixed)] and 11(4) GPa for the high pressure (HP) phase [fitted with a third-order Birch–Murnaghan equation of state, K' = 9(1)]. The elastic behaviour of the LP phase is anisotropic, with compressibilities βa:βb:βc in the ratio 1:4:2; the most compressible direction b coinciding with the orientation of empty 8-membered rings. The compressibility of the HP phase is isotropic. Trigonalization appears to be the most effective (and probably unique) mechanism of radical volume contraction for the ANA structure type.

Keywords

dehydrated analcimehigh pressurephase transitioncompressibilitycrystal structure
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 1 , February 2012 , pp. 129 - 142
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

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