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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titleStructural and thermal properties of Co-Cu-Fe hydrotalcite-like compoundspt_BR
dc.contributor.authorIglesias, AHpt_BR
dc.contributor.authorFerreira, OPpt_BR
dc.contributor.authorGouveia, DXpt_BR
dc.contributor.authorSouza, AGpt_BR
dc.contributor.authorde Paiva, JACpt_BR
dc.contributor.authorMendes, Jpt_BR
dc.contributor.authorAlves, OLpt_BR
unicamp.authorUNICAMP, State Univ Campinas, Inst Quim, LQES Lab Quim Estado Solido, BR-13081970 Campinas, SP, Brazil Univ Fed Ceara, Dept Fis, BR-60455900 Fortaleza, Ceara, Brazil Ctr Fed Educ Tecnol CEFET, BR-60040531 Fortaleza, Ceara, Brazilpt_BR
dc.subjectlayered double hydroxidespt_BR
dc.subjecthydrotalcite-like compoundspt_BR
dc.subjectanionic clayspt_BR
dc.subjectthermal decompositionpt_BR
dc.subjectmixed oxidespt_BR
dc.subjectFe-57 Mossbauer spectroscopypt_BR
dc.subjectdecomposition mechanismpt_BR
dc.subject.wosLayered Double Hydroxidespt_BR
dc.subject.wosMixed Oxidespt_BR
dc.subject.wosPhysicochemical Propertiespt_BR
dc.subject.wosDecomposition Productspt_BR
dc.description.abstractThe structural properties and thermal decomposition processes of Co-Cu-Fe ternary hydrotalcites (HT) have been studied through X-ray diffraction, thermogravimetric measurements, Fourier-transform infrared and Mossbauer spectroscopies. Due to the strong Jahn-Teller effect, the Cu-Fe layered system is stabilized only in the presence of Co2+. At low Co2+ contents, additional phases are segregated in the solids. X-ray patterns show the presence of Cu(OH)(2) and CuO. The decomposition process was investigated by in situ X-ray, in situ Mossbauer and FTIR experiments. By increasing the temperature from 25 degreesC up to 180degreesC we observed that the structural disorder increases. This effect has been likely attributed to the Co2+ --> CO3+ oxidation since thermal decomposition was carried out under static air atmosphere. Part of the Co3+ cations could migrate to the interlayer region, thus forming a metastable compound that still has a layered structure. Collapse of the layered structure was observed at about 200 degreesC. By further increasing the temperature the system becomes more crystalline and the formation Of CO3O4 is observed in the X-ray patterns. In Cu-rich HT, some of the carbonate anions are released at temperatures higher than 550degreesC and this phenomenon is attributed to the formation of a carbonate-rich phase. The specific surface area data present its highest values in the temperature range where the collapse of the layered structure takes place. (C) 2004 Elsevier Inc. All rights
dc.relation.ispartofJournal Of Solid State Chemistrypt_BR
dc.relation.ispartofabbreviationJ. Solid State Chem.pt_BR
dc.publisher.citySan Diegopt_BR
dc.publisherAcademic Press Inc Elsevier Sciencept_BR
dc.identifier.citationJournal Of Solid State Chemistry. Academic Press Inc Elsevier Science, v. 178, n. 1, n. 142, n. 152, 2005.pt_BR
dc.sourceWeb of Sciencept_BR
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