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GEOREF RECORD

Dehydration of the zeolite merlinoite from the Khibiny Massif, Russia; an in situ temperature-dependent single-crystal X-ray study

Anna S. Pakhomova, Thomas Armbruster, Sergey V. Krivovichev and Victor N. Yakovenchuk
Dehydration of the zeolite merlinoite from the Khibiny Massif, Russia; an in situ temperature-dependent single-crystal X-ray study
European Journal of Mineralogy (June 2014) 26 (3): 371-380

Abstract

Dehydration behaviour of the zeolite merlinoite, NaK (sub 11) [Al (sub 12) Si (sub 20) O (sub 64) ].15H (sub 2) O, from the Khibiny massif (Russia) was studied by means of single-crystal X-ray diffraction conjoined with step-wise heating to 225 degrees C. At room temperature merlinoite has the space group Immm with a = 14.0312(5), b = 14.2675(6), c = 10.0874(4) Aa, and V = 2019.40(14) Aa (super 3) . At 75 degrees C the merlinoite structure undergoes pronounced dehydration accompanied by a phase transition to a structure that has the space group P4 (sub 2) /nmc and remains consistent at elevated temperature. A fully dehydrated phase occurs at 200 degrees C (at 225 degrees C: a = 13.341(4), b = 13.341(4), c = 9.707(4) Aa, V = 1727.7(12) Aa (super 3) ). Dehydration-induced framework distortion and symmetry were found to be different from those observed for synthetic potassium merlinoite with the K (sub 11.5) [Al (sub 11.5) Si (sub 20.5) O (sub 64) ].15H (sub 2) O composition.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 26
Serial Issue: 3
Title: Dehydration of the zeolite merlinoite from the Khibiny Massif, Russia; an in situ temperature-dependent single-crystal X-ray study
Affiliation: University of Bern, Institute of Geological Sciences, Bern, Switzerland
Pages: 371-380
Published: 201406
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 27
Accession Number: 2014-055662
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 8 tables
N67°37'00" - N67°37'00", E34°00'00" - E34°00'00"
Secondary Affiliation: Saint Petersburg State University, RUS, Russian FederationRussian Academy of Sciences, Kola Science Centre, RUS, Russian Federation
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201430
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