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

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorBrito, G. E S
dc.creatorBriois, V.
dc.creatorPulcinelli, Sandra Helena
dc.creatorSantilli, Celso Valentim
dc.date2014-05-27T11:18:18Z
dc.date2016-10-25T18:14:44Z
dc.date2014-05-27T11:18:18Z
dc.date2016-10-25T18:14:44Z
dc.date1997-12-01
dc.date.accessioned2017-04-06T00:50:41Z
dc.date.available2017-04-06T00:50:41Z
dc.identifierJournal of Sol-Gel Science and Technology, v. 8, n. 1-3, p. 269-274, 1997.
dc.identifier0928-0707
dc.identifierhttp://hdl.handle.net/11449/65258
dc.identifierhttp://acervodigital.unesp.br/handle/11449/65258
dc.identifier10.1023/A:1026410313051
dc.identifierWOS:A1997WQ33400042
dc.identifier2-s2.0-0030719070
dc.identifierhttp://dx.doi.org/10.1023/A:1026410313051
dc.identifierhttp://dx.doi.org/10.1007/BF02436851
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/887001
dc.descriptionThe 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.
dc.languageeng
dc.relationJournal of Sol-Gel Science and Technology
dc.rightsinfo:eu-repo/semantics/closedAccess
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 Xerogels
dc.typeOtro


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