Thermal decomposition and structural reconstruction effect on Mg-Fe-based hydrotalcite compounds

dc.creatorFerreira, OP
dc.creatorAlves, OL
dc.creatorGouveia, DX
dc.creatorSouza, AG
dc.creatorde Paiva, JAC
dc.creatorMendes, J
dc.date2004
dc.dateSEP
dc.date2014-11-17T11:22:31Z
dc.date2015-11-26T17:30:39Z
dc.date2014-11-17T11:22:31Z
dc.date2015-11-26T17:30:39Z
dc.date.accessioned2018-03-29T00:17:33Z
dc.date.available2018-03-29T00:17:33Z
dc.identifierJournal Of Solid State Chemistry. Academic Press Inc Elsevier Science, v. 177, n. 9, n. 3058, n. 3069, 2004.
dc.identifier0022-4596
dc.identifierWOS:000223960700014
dc.identifier10.1016/j.jssc.2004.04.030
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/57997
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/57997
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/57997
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1285561
dc.descriptionThe thermal decomposition and structural reconstruction of Mg-Fe-based hydrotalcites (FIT) have been studied through thermogravimetric analyses, X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy and Mossbauer spectroscopy. The destruction of the layered structure took place at about 300degreesC. The broad peaks observed in the X-ray diffractograms suggest that the resultant oxides constitute a solid solution. For samples treated at temperatures higher than 500degreesC, the formation of the MgO and MgFe2O4 spinel phases is observed. Fe-57 Mossbauer spectroscopy was employed to monitor the Fe chemical environment for the samples annealed at different temperatures (100-900degreesC). In situ XRD experiments revealed that the HTs start an interlayer contraction at about 180degreesC. This phenomenon is identified as being due to a grafting process for which the interlamellar anions attach to the layers through a covalent bond. The reconstruction of the HTs was also investigated and its efficiency depends on the thermal annealing temperature and the Mg/Fe ratio. The structure of the reconstructed samples was found to be exactly the same as the parent structure. (C) 2004 Elsevier Inc. All rights reserved.
dc.description177
dc.description9
dc.description3058
dc.description3069
dc.languageen
dc.publisherAcademic Press Inc Elsevier Science
dc.publisherSan Diego
dc.publisherEUA
dc.relationJournal Of Solid State Chemistry
dc.relationJ. Solid State Chem.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectlayered double hydroxides
dc.subjecthydrotalcite-like compounds
dc.subjectpyroaurite
dc.subjectanionic clays
dc.subjectthermal decomposition
dc.subjectmixed oxides
dc.subjectspinel
dc.subjectrehydration
dc.subjectstructural reconstruction
dc.subjectMemory Effect
dc.subjectMossbauer spectroscopy
dc.subjectiron
dc.subjectLayered Double Hydroxides
dc.subjectIn-situ
dc.subjectMixed Oxides
dc.subjectPowder Xrd
dc.subjectAl
dc.subjectBehavior
dc.subjectRehydration
dc.subjectRemoval
dc.subjectWater
dc.subjectCalcination
dc.titleThermal decomposition and structural reconstruction effect on Mg-Fe-based hydrotalcite compounds
dc.typeArtículos de revistas


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