The solid solution in the system NaMgAl(SO4)3–KMgAl(SO4)3
We synthesized six samples in the compositional field NaMgAl(SO4)3–KMgAl(SO4)3 in 20 mol% increments from pure Na to pure K compounds. We investigated them by Powder X-Ray diffraction, 23Na, and 27Al Nuclear Magnetic Resonance spectroscopy. The results confirm NaMgAl(SO4)3 as a unique phase identica...
Published in: | Physics and Chemistry of Minerals |
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2023
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ftalborgunivpubl:oai:pure.atira.dk:publications/617a2baa-4868-46cc-9169-c268f26640fe 2024-10-13T14:07:54+00:00 The solid solution in the system NaMgAl(SO4)3–KMgAl(SO4)3 Jensen, Peter Grouleff Balic-Zunic, Tonci Nielsen, Ulla Gro Kofoed, Philip Miguel 2023-12 application/pdf https://vbn.aau.dk/da/publications/617a2baa-4868-46cc-9169-c268f26640fe https://doi.org/10.1007/s00269-023-01259-0 https://vbn.aau.dk/ws/files/616459941/s00269-023-01259-0.pdf http://www.scopus.com/inward/record.url?scp=85177748411&partnerID=8YFLogxK eng eng https://vbn.aau.dk/da/publications/617a2baa-4868-46cc-9169-c268f26640fe info:eu-repo/semantics/openAccess Jensen , P G , Balic-Zunic , T , Nielsen , U G & Kofoed , P M 2023 , ' The solid solution in the system NaMgAl(SO4)3–KMgAl(SO4)3 ' , Physics and Chemistry of Minerals , vol. 50 , no. 4 , 35 . https://doi.org/10.1007/s00269-023-01259-0 (Na,K)MgAl(SO ) Anhydrous sulfates Fumarolic minerals Koryakite NASICON-type structure article 2023 ftalborgunivpubl https://doi.org/10.1007/s00269-023-01259-0 2024-09-19T00:52:42Z We synthesized six samples in the compositional field NaMgAl(SO4)3–KMgAl(SO4)3 in 20 mol% increments from pure Na to pure K compounds. We investigated them by Powder X-Ray diffraction, 23Na, and 27Al Nuclear Magnetic Resonance spectroscopy. The results confirm NaMgAl(SO4)3 as a unique phase identical to a presumed new mineral found in the fumaroles of Eldfell and Hekla volcanoes in Iceland. It tolerates less than 10 mol% K substitution for Na. There exists a compositional gap to approximately Na0.65K0.35MgAl(SO4)3 from where a solid solution extends to KMgAl(SO4)3. The mineral koryakite [NaKMg2Al2(SO4)6] is a member of the latter solid solution series. The crystal structures of all (Na,K)MgAl(SO4)3 phases are akin to NASICON (NA Super Ionic CONductor). NaMgAl(SO4)3 has R-3c symmetry and a disordered distribution of Mg and Al among the octahedral sites with only one unique site for the alkali atom. The members of the solid solution have R-3 symmetry with ordered Mg–Al distribution and two unique alkali sites with different preferences for Na and K. In the crystal structure, the coordination of Na and/or K is trigonal antiprismatic, and these share bases with two octahedral Mg (Na) or Al (K) coordinations. These polyhedra are arranged in columns parallel to [001] and interconnected by SO4 tetrahedral groups. The alkali atoms from a column lie in the same (001) layers as the octahedrally coordinated atoms from the three neighboring rows. On the same level, parallel to (001), there are gaps in the other three neighboring columns forming channels containing Na+ or K+ ions. Article in Journal/Newspaper Hekla Iceland Aalborg University's Research Portal Eldfell ENVELOPE(-20.250,-20.250,63.433,63.433) Physics and Chemistry of Minerals 50 4 |
institution |
Open Polar |
collection |
Aalborg University's Research Portal |
op_collection_id |
ftalborgunivpubl |
language |
English |
topic |
(Na,K)MgAl(SO ) Anhydrous sulfates Fumarolic minerals Koryakite NASICON-type structure |
spellingShingle |
(Na,K)MgAl(SO ) Anhydrous sulfates Fumarolic minerals Koryakite NASICON-type structure Jensen, Peter Grouleff Balic-Zunic, Tonci Nielsen, Ulla Gro Kofoed, Philip Miguel The solid solution in the system NaMgAl(SO4)3–KMgAl(SO4)3 |
topic_facet |
(Na,K)MgAl(SO ) Anhydrous sulfates Fumarolic minerals Koryakite NASICON-type structure |
description |
We synthesized six samples in the compositional field NaMgAl(SO4)3–KMgAl(SO4)3 in 20 mol% increments from pure Na to pure K compounds. We investigated them by Powder X-Ray diffraction, 23Na, and 27Al Nuclear Magnetic Resonance spectroscopy. The results confirm NaMgAl(SO4)3 as a unique phase identical to a presumed new mineral found in the fumaroles of Eldfell and Hekla volcanoes in Iceland. It tolerates less than 10 mol% K substitution for Na. There exists a compositional gap to approximately Na0.65K0.35MgAl(SO4)3 from where a solid solution extends to KMgAl(SO4)3. The mineral koryakite [NaKMg2Al2(SO4)6] is a member of the latter solid solution series. The crystal structures of all (Na,K)MgAl(SO4)3 phases are akin to NASICON (NA Super Ionic CONductor). NaMgAl(SO4)3 has R-3c symmetry and a disordered distribution of Mg and Al among the octahedral sites with only one unique site for the alkali atom. The members of the solid solution have R-3 symmetry with ordered Mg–Al distribution and two unique alkali sites with different preferences for Na and K. In the crystal structure, the coordination of Na and/or K is trigonal antiprismatic, and these share bases with two octahedral Mg (Na) or Al (K) coordinations. These polyhedra are arranged in columns parallel to [001] and interconnected by SO4 tetrahedral groups. The alkali atoms from a column lie in the same (001) layers as the octahedrally coordinated atoms from the three neighboring rows. On the same level, parallel to (001), there are gaps in the other three neighboring columns forming channels containing Na+ or K+ ions. |
format |
Article in Journal/Newspaper |
author |
Jensen, Peter Grouleff Balic-Zunic, Tonci Nielsen, Ulla Gro Kofoed, Philip Miguel |
author_facet |
Jensen, Peter Grouleff Balic-Zunic, Tonci Nielsen, Ulla Gro Kofoed, Philip Miguel |
author_sort |
Jensen, Peter Grouleff |
title |
The solid solution in the system NaMgAl(SO4)3–KMgAl(SO4)3 |
title_short |
The solid solution in the system NaMgAl(SO4)3–KMgAl(SO4)3 |
title_full |
The solid solution in the system NaMgAl(SO4)3–KMgAl(SO4)3 |
title_fullStr |
The solid solution in the system NaMgAl(SO4)3–KMgAl(SO4)3 |
title_full_unstemmed |
The solid solution in the system NaMgAl(SO4)3–KMgAl(SO4)3 |
title_sort |
solid solution in the system namgal(so4)3–kmgal(so4)3 |
publishDate |
2023 |
url |
https://vbn.aau.dk/da/publications/617a2baa-4868-46cc-9169-c268f26640fe https://doi.org/10.1007/s00269-023-01259-0 https://vbn.aau.dk/ws/files/616459941/s00269-023-01259-0.pdf http://www.scopus.com/inward/record.url?scp=85177748411&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-20.250,-20.250,63.433,63.433) |
geographic |
Eldfell |
geographic_facet |
Eldfell |
genre |
Hekla Iceland |
genre_facet |
Hekla Iceland |
op_source |
Jensen , P G , Balic-Zunic , T , Nielsen , U G & Kofoed , P M 2023 , ' The solid solution in the system NaMgAl(SO4)3–KMgAl(SO4)3 ' , Physics and Chemistry of Minerals , vol. 50 , no. 4 , 35 . https://doi.org/10.1007/s00269-023-01259-0 |
op_relation |
https://vbn.aau.dk/da/publications/617a2baa-4868-46cc-9169-c268f26640fe |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s00269-023-01259-0 |
container_title |
Physics and Chemistry of Minerals |
container_volume |
50 |
container_issue |
4 |
_version_ |
1812814448697540608 |