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dc.date.accessioned 2021-09-17T18:14:32Z
dc.date.available 2021-09-17T18:14:32Z
dc.date.issued 2019-07
dc.identifier.uri http://sedici.unlp.edu.ar/handle/10915/125120
dc.description.abstract Halloysite and its heating products demand attention due to its multiple technological applications, and in particular for its natural nanostructure. The purpose of this paper is to present a structural characterization of these materials and its firing products up to mullite. To achieve this objective, the techniques of conventional X-ray diffraction (XRD) and X-ray absorption near-edge structure (XANES) were used, in addition to scanning electron microscopy (SEM), and simultaneous thermogravimetric and differential thermal analysis (DTA-TG). SEM has allowed to prove that the nanotubular morphology (acicular) of halloysite was retained for all temperatures (500, 800, 1100 and 1250 °C). For the temperatures between 500 and 800 °C the metahalloysite phase was identified. The 1100 °C fired samples presented the spinel aluminosilicate phase. Finally, after high temperature treatments the mullite phase was detected as the only aluminum containing crystalline phase accompanied by cristobalite and glassy phase. The XANES spectra confirmed the octahedral aluminum coordination in native halloysite, this coordination was progressively lost with the thermal treatments giving place to the presence of the four folded coordination. In the intermediate treatments, the so called metahalloysite phase, presented some three and five coordination slight contributions. Particularly, the metahalloysite Al K XANES spectra were not reported before. en
dc.format.extent 19-26 es
dc.language en es
dc.subject halloysite es
dc.subject thermal behavior es
dc.subject structure es
dc.subject XANES es
dc.title Halloysite nanotube and its firing products: Structural characterization of halloysite, metahalloysite, spinel type silicoaluminate and mullite en
dc.type Articulo es
sedici.identifier.other doi:10.1016/j.elspec.2019.05.007 es
sedici.identifier.issn 0368-2048 es
sedici.creator.person Andrini, Leandro Rubén es
sedici.creator.person Moreira Toja, Ramiro Julián es
sedici.creator.person Conconi, María Susana es
sedici.creator.person Requejo, Félix Gregorio es
sedici.creator.person Rendtorff Birrer, Nicolás Maximiliano es
sedici.subject.materias Ciencias Exactas es
sedici.description.fulltext true es
mods.originInfo.place Facultad de Ciencias Exactas es
mods.originInfo.place Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas es
mods.originInfo.place Centro de Tecnología de Recursos Minerales y Cerámica es
sedici.subtype Preprint es
sedici.rights.license Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
sedici.rights.uri http://creativecommons.org/licenses/by-nc-sa/4.0/
sedici.description.peerReview peer-review es
sedici.relation.journalTitle Journal of Electron Spectroscopy and Related Phenomena es
sedici.relation.journalVolumeAndIssue vol. 234 es

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Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) Except where otherwise noted, this item's license is described as Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)