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Raman study of high-pressure phase transitions in dehydrated analcime

Published online by Cambridge University Press:  05 July 2018

Yu. M. Miroshnichenko  and
S. V. Goryainov
Yu. M. Miroshnichenko*
Affiliation:
Novosibirsk State University, Pirogova st. 2, Novosibirsk, 630090, Russia
S. V. Goryainov
Affiliation:
Institute of Mineralogy & Petrography, pr. Koptyuga 3, Novosibirsk, 630090, Russia
*
*E-mail: svg@uiggm.nsc.ru
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Abstract

The high-pressure behaviour (up to 30 kbar) of dehydrated analcime, Na[AlSi2O6), has been studied in detail using polarized microscopy and Raman micro-spectroscopy. Samples were compressed using a diamond anvil cell in a quasi-hydrostatic medium (glycerol or water-ice). Two transitions at 3.7 and 11 kbar were observed.

At the first transition, phase II is observed under cross polarized light as a contrasting black zone, moving from the edge to the centre of the sample. At this transition the strong Raman doublet at ∼480 and 500 cm−1 transforms discontinuously to a singlet, which is similar to that of quasi-cubic natural analcime. This transition, with an increase of effective symmetry, seems unusual on increasing pressure.

The analcime framework may be thought of as an array of four-, six-, or eight-membered interconnected rings. Phase transitions in the analcime group are considered in the literature in terms of deformations of the six-membered rings. However, the present work shows that these phase transitions should be associated with deformations of the four-membered rings (as the minimum size secondary building units) by rotation of rigid TO4 units. The strongest Raman band frequency is correlated with the mean T-O-T angle inside the four-membered ring: a rate of 4.5 cm−1/degree was found for analcimes and leucites. Using this correlation, one can estimate from Raman data the possible deformation of four-membered rings at the phase transitions.

Keywords

phase transitionshigh pressureanalcimeRaman spectra
Type
Research Article
Information
Mineralogical Magazine , Volume 64 , Issue 2 , April 2000 , pp. 301 - 309
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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