Octahedral cation distribution in palygorskite

The OH speciation of 18 palygorskite samples from various localities were evaluated by near infrared spectroscopy (NIR) and compared to the corresponding octahedral composition derived from independent, single-particle analytical electron microscopy (AEM). NIR gives evidence for dioctahedral-like (A...

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Autores: Chryssikos, Georgios D., Gionis, Vassilis, Kacandes, Georges H., Stathopoulou, Elizabeth T., Súarez Barrios, Mercedes, García Romero, Emilia, Sánchez del Río, Manuel
Tipo de recurso: artículo
Fecha de publicación:2009
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/50678
Acceso en línea:https://hdl.handle.net/20.500.14352/50678
Access Level:acceso abierto
Palabra clave:549.6
Palygorskite
Fe-rich
Mg-rich
structure
near infrared Spectroscopy
Trioctahedral
Dioctahedral
Composition
AEM
Sepiolite
Mineralogía (Geología)
2506.11 Mineralogía
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oai_identifier_str oai:docta.ucm.es:20.500.14352/50678
network_acronym_str ES
network_name_str España
repository_id_str
spelling Octahedral cation distribution in palygorskiteChryssikos, Georgios D.Gionis, VassilisKacandes, Georges H.Stathopoulou, Elizabeth T.Súarez Barrios, MercedesGarcía Romero, EmiliaSánchez del Río, Manuel549.6PalygorskiteFe-richMg-richstructurenear infrared SpectroscopyTrioctahedralDioctahedralCompositionAEMSepioliteMineralogía (Geología)2506.11 MineralogíaThe OH speciation of 18 palygorskite samples from various localities were evaluated by near infrared spectroscopy (NIR) and compared to the corresponding octahedral composition derived from independent, single-particle analytical electron microscopy (AEM). NIR gives evidence for dioctahedral-like (AlAlOH, AlFe3+OH, Fe3+Fe3+OH) and trioctahedral-like (Mg3OH) species. Therefore, palygorskite can be approximated by the formula yMg5 Si8O20(OH)2·(1 – y)[xMg2Fe2·(1 – x)Mg2Al2]Si8O20(OH)2, where x is the Fe content of the dioctahedral component, and y is the trioctahedral fraction. The values of x estimated from the NIR data are in excellent agreement with the Fe/(VIAl + Fe) ratio from AEM (R2 = 0.98, σ = 0.03), thus suggesting that all octahedral Al and Fe in palygorskite participate in M2M2OH (dioctahedral-like) arrangements. Furthermore, y values from AEM can be compared to NIR (R2 = 0.90 and σ = 0.05) after calibrating the relative intensity of the Mg3OH vs. (Al,Fe)2OH overtone bands using AEM data. The agreement between the spectroscopic and analytical data are excellent. The data show that Fe3+ for Al substitution varies continuously in the analyzed samples over a broad range (0 < x < 0.7), suggesting that fully ferric dioctahedral palygorskites (x = 1) may exist. On the other hand, the observed upper trioctahedral limit of y = 0.50 calls for the detailed structural comparison of Mg-rich palygorskite with sepiolite.Mineralogical Society of AmericaUniversidad Complutense de Madrid20092009-01-0120092009-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/50678reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/506782026-06-02T12:44:21Z
dc.title.none.fl_str_mv Octahedral cation distribution in palygorskite
title Octahedral cation distribution in palygorskite
spellingShingle Octahedral cation distribution in palygorskite
Chryssikos, Georgios D.
549.6
Palygorskite
Fe-rich
Mg-rich
structure
near infrared Spectroscopy
Trioctahedral
Dioctahedral
Composition
AEM
Sepiolite
Mineralogía (Geología)
2506.11 Mineralogía
title_short Octahedral cation distribution in palygorskite
title_full Octahedral cation distribution in palygorskite
title_fullStr Octahedral cation distribution in palygorskite
title_full_unstemmed Octahedral cation distribution in palygorskite
title_sort Octahedral cation distribution in palygorskite
dc.creator.none.fl_str_mv Chryssikos, Georgios D.
Gionis, Vassilis
Kacandes, Georges H.
Stathopoulou, Elizabeth T.
Súarez Barrios, Mercedes
García Romero, Emilia
Sánchez del Río, Manuel
author Chryssikos, Georgios D.
author_facet Chryssikos, Georgios D.
Gionis, Vassilis
Kacandes, Georges H.
Stathopoulou, Elizabeth T.
Súarez Barrios, Mercedes
García Romero, Emilia
Sánchez del Río, Manuel
author_role author
author2 Gionis, Vassilis
Kacandes, Georges H.
Stathopoulou, Elizabeth T.
Súarez Barrios, Mercedes
García Romero, Emilia
Sánchez del Río, Manuel
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 549.6
Palygorskite
Fe-rich
Mg-rich
structure
near infrared Spectroscopy
Trioctahedral
Dioctahedral
Composition
AEM
Sepiolite
Mineralogía (Geología)
2506.11 Mineralogía
topic 549.6
Palygorskite
Fe-rich
Mg-rich
structure
near infrared Spectroscopy
Trioctahedral
Dioctahedral
Composition
AEM
Sepiolite
Mineralogía (Geología)
2506.11 Mineralogía
description The OH speciation of 18 palygorskite samples from various localities were evaluated by near infrared spectroscopy (NIR) and compared to the corresponding octahedral composition derived from independent, single-particle analytical electron microscopy (AEM). NIR gives evidence for dioctahedral-like (AlAlOH, AlFe3+OH, Fe3+Fe3+OH) and trioctahedral-like (Mg3OH) species. Therefore, palygorskite can be approximated by the formula yMg5 Si8O20(OH)2·(1 – y)[xMg2Fe2·(1 – x)Mg2Al2]Si8O20(OH)2, where x is the Fe content of the dioctahedral component, and y is the trioctahedral fraction. The values of x estimated from the NIR data are in excellent agreement with the Fe/(VIAl + Fe) ratio from AEM (R2 = 0.98, σ = 0.03), thus suggesting that all octahedral Al and Fe in palygorskite participate in M2M2OH (dioctahedral-like) arrangements. Furthermore, y values from AEM can be compared to NIR (R2 = 0.90 and σ = 0.05) after calibrating the relative intensity of the Mg3OH vs. (Al,Fe)2OH overtone bands using AEM data. The agreement between the spectroscopic and analytical data are excellent. The data show that Fe3+ for Al substitution varies continuously in the analyzed samples over a broad range (0 < x < 0.7), suggesting that fully ferric dioctahedral palygorskites (x = 1) may exist. On the other hand, the observed upper trioctahedral limit of y = 0.50 calls for the detailed structural comparison of Mg-rich palygorskite with sepiolite.
publishDate 2009
dc.date.none.fl_str_mv 2009
2009-01-01
2009
2009-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/50678
url https://hdl.handle.net/20.500.14352/50678
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Mineralogical Society of America
publisher.none.fl_str_mv Mineralogical Society of America
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869406495307726848
score 15,300719

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