RAMAN STUDY OF HIGH-PRESSURE PHASE TRANSITIONS IN DEHYDRATED ANALCIME
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dc.contributor.author | Miroshnichenko Yu.M. | |
dc.contributor.author | Goryainov S.V. | |
dc.date.accessioned | 2021-01-29T03:39:17Z | |
dc.date.available | 2021-01-29T03:39:17Z | |
dc.date.issued | 2000 | |
dc.identifier | https://elibrary.ru/item.asp?id=13359723 | |
dc.identifier.citation | Mineralogical Magazine, 2000, 64, 2, 301-309 | |
dc.identifier.issn | 0026-461X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/23950 | |
dc.description.abstract | The high-pressure behaviour (up to 30 kbar) of dehydrated analcime, Na[AlSi 2 O 6 ), 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. | |
dc.title | RAMAN STUDY OF HIGH-PRESSURE PHASE TRANSITIONS IN DEHYDRATED ANALCIME | |
dc.type | Статья |
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