Dehydration-induced structural transformations of the microporous zirconosilicate elpidite

Dehydration-induced structural transformations of the microporous zirconosilicate elpidite

The structural transformations accompanying the thermal dehydration of natural elpidite, Na 2 ZrSi 6 O 15 · 3H 2 O, have been studied by X-ray powder diffraction and IR spectroscopy. The crystal structures of both elpidite ( a = 7.1136(1), b = 14.6764(2), c = 14.5977(2) Å; sp. Gr. Pbcm ) and the deh...

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Veröffentlicht in:Inorganic materials 2011-05, Vol.47 (5), p.506-512
Hauptverfasser: Zubkova, N. V., Ksenofontov, D. A., Kabalov, Yu. K., Chukanov, N. V., Nedel’ko, V. V., Pekov, I. V., Pushcharovsky, D. Yu
Format: Artikel
Sprache:eng
Schlagworte:
Cations
Chemistry
Chemistry and Materials Science
Crystal structure
Dehydration
Diffraction
Distortion
Industrial Chemistry/Chemical Engineering
Infrared radiation
Inorganic Chemistry
Materials Science
Transformations
X-rays
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Zusammenfassung:The structural transformations accompanying the thermal dehydration of natural elpidite, Na 2 ZrSi 6 O 15 · 3H 2 O, have been studied by X-ray powder diffraction and IR spectroscopy. The crystal structures of both elpidite ( a = 7.1136(1), b = 14.6764(2), c = 14.5977(2) Å; sp. Gr. Pbcm ) and the dehydration product Na 2 ZrSi 6 O 15 ( a = 14.0899(1), b = 14.4983(1), c = 14.3490(1)Å; sp. gr. Cmce = Cmca ) are based on a heteropolyhedral Si-Zr-O framework. The Na cations and (in hydrous elpidite) H 2 O molecules reside in extra-framework sites. The dehydration-induced distortion of the framework leads to a doubling of the a cell parameter, and the water loss is accompanied by a considerable decrease in molar volume.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168511050232