EXAFS and XRD Study of the Structural Evolution during Isothermal Sintering of SnO2 Xerogels

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dc.contributor.authorBrito, G. E S [UNESP]
dc.contributor.authorBriois, V.
dc.contributor.authorPulcinelli, Sandra Helena [UNESP]
dc.contributor.authorSantilli, Celso Valentim [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:18:18Z
dc.date.available2014-05-27T11:18:18Z
dc.date.issued1997-12-01
dc.description.abstractThe formation of an ordered (crystalline) phase during isothermal sintering of SnO2 monolithic xerogels, at 200, 250, 300, 400, 500, 600 and 700°C, has been analyzed by the combined use of EXAFS and XRD techniques. For the desiccated gel (110°C), EXAFS results show the formation of small microcrystallites with the incipient cassiterite structure. Between 110 and 250°C, the dehydratation reaction leads to an amorphization evidenced by a decrease of the long and short range crystallographic order. It is due to fissure formation in the xerogel network. For higher temperatures, a continuous coagulation of the crystallites occurs, leading to grain growth. Grain and pore growth obeys the same kinetic relation, so that the microstructure grows by simple enlargement while its morphology is static.en
dc.description.affiliationLURE Bâtiment 209D, 91 405 Orsay Cedex
dc.description.affiliationInstituto de Quimica UNESP, CP 355, 14800-900 Araraquara, SP
dc.description.affiliationUnespInstituto de Quimica UNESP, CP 355, 14800-900 Araraquara, SP
dc.format.extent269-274
dc.identifierhttp://dx.doi.org/10.1023/A:1026410313051
dc.identifierhttp://dx.doi.org/10.1007/BF02436851
dc.identifier.citationJournal of Sol-Gel Science and Technology, v. 8, n. 1-3, p. 269-274, 1997.
dc.identifier.doi10.1023/A:1026410313051
dc.identifier.issn0928-0707
dc.identifier.lattes9971202585286967
dc.identifier.lattes5584298681870865
dc.identifier.orcid0000-0002-8356-8093
dc.identifier.scopus2-s2.0-0030719070
dc.identifier.urihttp://hdl.handle.net/11449/65258
dc.identifier.wosWOS:A1997WQ33400042
dc.language.isoeng
dc.relation.ispartofJournal of Sol-Gel Science and Technology
dc.relation.ispartofjcr1.745
dc.relation.ispartofsjr0,477
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectEXAFS
dc.subjectSintering
dc.subjectSnO2 xerogels
dc.subjectXRD
dc.subjectAmorphization
dc.subjectCoagulation
dc.subjectCrystal microstructure
dc.subjectCrystalline materials
dc.subjectDehydration
dc.subjectGrain growth
dc.subjectMorphology
dc.subjectReaction kinetics
dc.subjectThermal effects
dc.subjectTin compounds
dc.subjectX ray diffraction analysis
dc.subjectExtended X ray absorption fine structures (EXAFS)
dc.subjectIsothermal sintering
dc.subjectStructural evolution
dc.subjectXerogels
dc.subjectGels
dc.titleEXAFS and XRD Study of the Structural Evolution during Isothermal Sintering of SnO2 Xerogelsen
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights
unesp.author.lattes9971202585286967
unesp.author.lattes5584298681870865[4]
unesp.author.orcid0000-0002-8356-8093[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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