High-temperature induced dehydration, phase transition and exsolution in amicite: A single-crystal X-ray study
Temperature dependent single-crystal X-ray data were collected on amicite K4Na4(Al8Si8O32)·11H2O from Kola Peninsula (Russia) in steps of 25 °C from room temperature to 175 °C and of 50 °C up to 425 °C. At room temperature amicite has space group I2 with a = 10.2112(1), b = 10.4154(1), c = 9.8802(1)...
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ftunivbern:oai:boris.unibe.ch:45471 2023-08-20T04:07:48+02:00 High-temperature induced dehydration, phase transition and exsolution in amicite: A single-crystal X-ray study Pakhomova, Anna S. Danisi, Rosa Micaela Armbruster, Thomas Lazic, Biljana Gfeller, Frank Krivovichev, Sergey V. Yakovenchuk, Victor N. 2013-12-01 application/pdf https://boris.unibe.ch/45471/1/parkhomova_armbruster.pdf https://boris.unibe.ch/45471/ eng eng Elsevier https://boris.unibe.ch/45471/ info:eu-repo/semantics/restrictedAccess Pakhomova, Anna S.; Danisi, Rosa Micaela; Armbruster, Thomas; Lazic, Biljana; Gfeller, Frank; Krivovichev, Sergey V.; Yakovenchuk, Victor N. (2013). High-temperature induced dehydration, phase transition and exsolution in amicite: A single-crystal X-ray study. Microporous and mesoporous materials, 182, pp. 207-219. Elsevier 10.1016/j.micromeso.2013.08.036 <http://dx.doi.org/10.1016/j.micromeso.2013.08.036> 540 Chemistry 550 Earth sciences & geology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2013 ftunivbern https://doi.org/10.1016/j.micromeso.2013.08.036 2023-07-31T21:04:36Z Temperature dependent single-crystal X-ray data were collected on amicite K4Na4(Al8Si8O32)·11H2O from Kola Peninsula (Russia) in steps of 25 °C from room temperature to 175 °C and of 50 °C up to 425 °C. At room temperature amicite has space group I2 with a = 10.2112(1), b = 10.4154(1), c = 9.8802(1) Å, β = 88.458(1)°, V = 1050.416(18) Å3. Its crystal structure is based on a Si–Al ordered tetrahedral framework of the GIS type with two systems of eight-membered channels running along the a and c axes. Extraframework K and Na cations are ordered at two fully occupied sites. Above 75 °C amicite was found to partly dehydrate into two separate but coherently intergrown phases, both of space group I2/a, one K-rich ∼K8(Al8Si8O32) ·4H2O (at 75 °C: a = 10.038(2), b = 9.6805(19), c = 9.843(2) Å, β = 89.93(3)°, V = 956.5(3) Å3) and the other Na-rich ∼Na8(Al8Si8O32)·2H2O (at 75 °C: a = 9.759(2), b = 8.9078(18), c = 9.5270(19) Å, β = 89.98(3)°, V = 828.2(3) Å3). Upon further heating above 75 °C the Na- and K-phases lost remaining H2O with only minor influence on the framework structure and became anhydrous at 175 °C and 375 °C, respectively. The two anhydrous phases persisted up to 425 °C. Backscattered electron images of a heated crystal displayed lamellar intergrowth of the K- and Na-rich phases. Exposed to ambient humid conditions K- and Na-rich phases rehydrated and conjoined to the original one phase I2 structure. Article in Journal/Newspaper kola peninsula BORIS (Bern Open Repository and Information System, University of Bern) Kola Peninsula Microporous and Mesoporous Materials 182 207 219 |
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Open Polar |
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BORIS (Bern Open Repository and Information System, University of Bern) |
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ftunivbern |
language |
English |
topic |
540 Chemistry 550 Earth sciences & geology |
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540 Chemistry 550 Earth sciences & geology Pakhomova, Anna S. Danisi, Rosa Micaela Armbruster, Thomas Lazic, Biljana Gfeller, Frank Krivovichev, Sergey V. Yakovenchuk, Victor N. High-temperature induced dehydration, phase transition and exsolution in amicite: A single-crystal X-ray study |
topic_facet |
540 Chemistry 550 Earth sciences & geology |
description |
Temperature dependent single-crystal X-ray data were collected on amicite K4Na4(Al8Si8O32)·11H2O from Kola Peninsula (Russia) in steps of 25 °C from room temperature to 175 °C and of 50 °C up to 425 °C. At room temperature amicite has space group I2 with a = 10.2112(1), b = 10.4154(1), c = 9.8802(1) Å, β = 88.458(1)°, V = 1050.416(18) Å3. Its crystal structure is based on a Si–Al ordered tetrahedral framework of the GIS type with two systems of eight-membered channels running along the a and c axes. Extraframework K and Na cations are ordered at two fully occupied sites. Above 75 °C amicite was found to partly dehydrate into two separate but coherently intergrown phases, both of space group I2/a, one K-rich ∼K8(Al8Si8O32) ·4H2O (at 75 °C: a = 10.038(2), b = 9.6805(19), c = 9.843(2) Å, β = 89.93(3)°, V = 956.5(3) Å3) and the other Na-rich ∼Na8(Al8Si8O32)·2H2O (at 75 °C: a = 9.759(2), b = 8.9078(18), c = 9.5270(19) Å, β = 89.98(3)°, V = 828.2(3) Å3). Upon further heating above 75 °C the Na- and K-phases lost remaining H2O with only minor influence on the framework structure and became anhydrous at 175 °C and 375 °C, respectively. The two anhydrous phases persisted up to 425 °C. Backscattered electron images of a heated crystal displayed lamellar intergrowth of the K- and Na-rich phases. Exposed to ambient humid conditions K- and Na-rich phases rehydrated and conjoined to the original one phase I2 structure. |
format |
Article in Journal/Newspaper |
author |
Pakhomova, Anna S. Danisi, Rosa Micaela Armbruster, Thomas Lazic, Biljana Gfeller, Frank Krivovichev, Sergey V. Yakovenchuk, Victor N. |
author_facet |
Pakhomova, Anna S. Danisi, Rosa Micaela Armbruster, Thomas Lazic, Biljana Gfeller, Frank Krivovichev, Sergey V. Yakovenchuk, Victor N. |
author_sort |
Pakhomova, Anna S. |
title |
High-temperature induced dehydration, phase transition and exsolution in amicite: A single-crystal X-ray study |
title_short |
High-temperature induced dehydration, phase transition and exsolution in amicite: A single-crystal X-ray study |
title_full |
High-temperature induced dehydration, phase transition and exsolution in amicite: A single-crystal X-ray study |
title_fullStr |
High-temperature induced dehydration, phase transition and exsolution in amicite: A single-crystal X-ray study |
title_full_unstemmed |
High-temperature induced dehydration, phase transition and exsolution in amicite: A single-crystal X-ray study |
title_sort |
high-temperature induced dehydration, phase transition and exsolution in amicite: a single-crystal x-ray study |
publisher |
Elsevier |
publishDate |
2013 |
url |
https://boris.unibe.ch/45471/1/parkhomova_armbruster.pdf https://boris.unibe.ch/45471/ |
geographic |
Kola Peninsula |
geographic_facet |
Kola Peninsula |
genre |
kola peninsula |
genre_facet |
kola peninsula |
op_source |
Pakhomova, Anna S.; Danisi, Rosa Micaela; Armbruster, Thomas; Lazic, Biljana; Gfeller, Frank; Krivovichev, Sergey V.; Yakovenchuk, Victor N. (2013). High-temperature induced dehydration, phase transition and exsolution in amicite: A single-crystal X-ray study. Microporous and mesoporous materials, 182, pp. 207-219. Elsevier 10.1016/j.micromeso.2013.08.036 <http://dx.doi.org/10.1016/j.micromeso.2013.08.036> |
op_relation |
https://boris.unibe.ch/45471/ |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.micromeso.2013.08.036 |
container_title |
Microporous and Mesoporous Materials |
container_volume |
182 |
container_start_page |
207 |
op_container_end_page |
219 |
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1774719685303992320 |