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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titleCharacterization of Ni-containing goethites by Mossbauer spectroscopy and other techniquespt_BR
dc.contributor.authorde Carvalho-e-Silva, MLMpt_BR
dc.contributor.authorPartiti, CSMpt_BR
dc.contributor.authorEnzweiler, Jpt_BR
dc.contributor.authorPetit, Spt_BR
dc.contributor.authorNetto, SMpt_BR
dc.contributor.authorde Oliveira, SMBpt_BR
unicamp.authorUniv Sao Paulo, Inst Fis, BR-05389970 Sao Paulo, Brazil Univ Estadual Campinas, Inst Geociencias, BR-13083970 Campinas, SP, Brazil Univ Poitiers, CNRS UMR 6532 HydrASA, F-86022 Poitiers, France Univ Sao Paulo, Inst Geociencias, BR-05422970 Sao Paulo, Brazilpt_BR
dc.subject.wosAl-substituted Goethitespt_BR
dc.subject.wosUnit-cell Dimensionspt_BR
dc.subject.wosIron-oxidespt_BR
dc.subject.wosSynthetic Goethitespt_BR
dc.subject.wosApplied-fieldpt_BR
dc.subject.wosAluminumpt_BR
dc.subject.wosFerrihydritept_BR
dc.subject.wosSoilspt_BR
dc.subject.wosMnpt_BR
dc.subject.wosDehydroxylationpt_BR
dc.description.abstractA set of goethite samples from the oxidized level of Vermelho Ni-lateritic deposit was investigated by TEM, XRD, TGA-DTA, FTIR and Mossbauer spectroscopy and compared to a series of synthetic goethite samples, with similar Ni content. Natural Ni-containing goethite presents poor crystallinity and does not incorporate more than about 4 mol% Ni. Natural goethite particles also contain significant amounts of Al and Cr (1.6 and 0.7 mol%, in average, respectively). The wavenumbers of the OH deformation vibration bands delta-OH (in-plane vibration) and lengthening gamma-OH (out of plane vibration) are coarsely negatively correlated with Ni content. The weight loss during the thermal analysis of synthetic samples shows a good linear relationship with Ni content, pointing to a proton uptake in order to compensate a possible charge imbalance due to a Ni2+ for Fe3+ substitution. The Mossbauer spectra of Ni-goethite present one sextet whose parameters are in agreement with those usually reported for goethite. The magnitude of the hyperfine field slightly decreases with increasing Ni, while the other parameters remain unchanged. These variations may be explained by Ni incorporation, but also by differences in the crystallinity. The effect of the low Ni concentration in our samples was a weak to medium correlation of the analytical signals with the Ni content in goethite, but when considered together, the results indicate that isomorphic substitution is occurring.pt
dc.relation.ispartofHyperfine Interactionspt_BR
dc.relation.ispartofabbreviationHyperfine Interact.pt_BR
dc.publisher.cityDordrechtpt_BR
dc.publisher.countryHolandapt_BR
dc.publisherKluwer Academic Publpt_BR
dc.date.issued2002pt_BR
dc.identifier.citationHyperfine Interactions. Kluwer Academic Publ, v. 142, n. 41732, n. 559, n. 576, 2002.pt_BR
dc.language.isoenpt_BR
dc.description.volume142pt_BR
dc.description.issuenumber41732pt_BR
dc.description.firstpage559pt_BR
dc.description.lastpage576pt_BR
dc.rightsfechadopt_BR
dc.sourceWeb of Sciencept_BR
unicamp.cruespUSPpt_BR
dc.identifier.issn0304-3843pt_BR
dc.identifier.wosidWOS:000181044800006pt_BR
dc.identifier.doi10.1023/A:1022426220083pt_BR
dc.date.available2014-11-17T15:25:53Z
dc.date.available2015-11-26T16:44:14Z-
dc.date.accessioned2014-11-17T15:25:53Z
dc.date.accessioned2015-11-26T16:44:14Z-
dc.description.provenanceMade available in DSpace on 2014-11-17T15:25:53Z (GMT). No. of bitstreams: 1 WOS000181044800006.pdf: 205155 bytes, checksum: 6a1248f018ba910cec7b049746b5636a (MD5) Previous issue date: 2002en
dc.description.provenanceMade available in DSpace on 2015-11-26T16:44:14Z (GMT). No. of bitstreams: 2 WOS000181044800006.pdf: 205155 bytes, checksum: 6a1248f018ba910cec7b049746b5636a (MD5) WOS000181044800006.pdf.txt: 41597 bytes, checksum: 84e1fcb730845e7d0c43566573f17050 (MD5) Previous issue date: 2002en
dc.identifier.urihttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/62867pt_BR
dc.identifier.urihttp://www.repositorio.unicamp.br/handle/REPOSIP/62867
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/62867-
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