Dehydration of the zeolite merlinoite from the Khibiny massif, Russia: an <I>in situ</I> temperature-dependent single-crystal X-ray study

Pakhomova, Anna S.; Armbruster, Thomas Michael; Krivovichev, Sergey V.; Yakovenchuk, Victor N. (2014). Dehydration of the zeolite merlinoite from the Khibiny massif, Russia: an <I>in situ</I> temperature-dependent single-crystal X-ray study. European journal of mineralogy, 26(3), pp. 371-380. E. Schweizerbart'sche Verlagsbuchhandlung (Nägele u. Obermiller) 10.1127/0935-1221/2014/0026-2380

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Dehydration behaviour of the zeolite merlinoite, NaK11[Al12Si20O64]·15H2O, from the Khibiny massif (Russia) was studied by means of single-crystal X-ray diffraction conjoined with step-wise heating to 225 C. At room temperature merlinoite has the space group Immm with a = 14.0312(5), b = 14.2675(6), c = 10.0874(4) Å, and V = 2019.40(14) Å3. At 75 °C the merlinoite structure undergoes pronounced dehydration accompanied by a phase transition to a structure that has the space group P42/nmc and remains consistent at elevated temperature. A fully dehydrated phase occurs at 200 °C (at 225 °C: a = 13.341(4), b = 13.341(4), c = 9.707(4) Å, V = 1727.7(12) Å3). Dehydration-induced framework distortion and symmetry were found to be different from those observed for synthetic potassium merlinoite with the K11.5[Al11.5Si20.5O64]·15H2O composition.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Armbruster, Thomas Michael

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0935-1221

Publisher:

E. Schweizerbart'sche Verlagsbuchhandlung (Nägele u. Obermiller)

Language:

English

Submitter:

Sarah Antenen

Date Deposited:

11 Aug 2015 15:21

Last Modified:

11 Aug 2015 15:21

Publisher DOI:

10.1127/0935-1221/2014/0026-2380

URI:

https://boris.unibe.ch/id/eprint/70754

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