Synthesis and crystal phase evaluation of hydroxylapatite using the rietveld-maximum entropy method

Página do item simplificado
dc.contributor.authorAndrade, André Vitor Chaves de [UNESP]
dc.contributor.authorSilva, José Caetano Zurita da
dc.contributor.authorPaiva-Santos, Carlos Oliveira [UNESP]
dc.contributor.authorWeber, Cleverson
dc.contributor.authorSantos Utuni, Vegner Hizau dos [UNESP]
dc.contributor.authorTebcherani, Sérgio Mazurek
dc.contributor.authorFerreira Borges, Christiane Philippini
dc.contributor.authorCosta, Elias da
dc.contributor.authorManent, Salvador Martinez
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Estadual de Ponta Grossa (UEPG)
dc.date.accessioned2014-05-27T11:21:11Z
dc.date.available2014-05-27T11:21:11Z
dc.date.issued2004-12-01
dc.description.abstractBioceramic systems based on hydroxylapatite (HAP) are an important class of bioactive materials that may promote bone regeneration. The aim of this research was to evaluate how the stoichiometry of HAP influences its microstructural properties when diagnosed using the combined Rietveld method and Maximum entropy method (MEM). The Rietveld Method (RM) is recognizably a powerful tool used to obtain structural and microstructural information of polycrystalline samples analyzed by x-ray diffraction. Latterly have combined the RM with the maximum entropy method (MEM), with the goal of improve structural refinement results. The MEM provides high resolution maps of electron density and their analysis leave the accurate localization of atoms inside of unit cell. Like that, cycles Rietveld-MEM allow an excellent structural refinement In this work, a hydroxylapatite sample obtained by emulsion method had its structure refined using one cycle Rietveld-MEM with x-ray diffraction data. The indices obtained in initial refinement was Rwp = 7.50%, Re = 6.56%, S - 1.14% e RB = 1.03%. After MEM refinement and electron densities maps analysis to correction of atomics positions, the news indicators of Rietveld refinement quality was Rwp = 7.35%, Re = 6.56%, S = 1.12% and RB = 0.75%. The excellent result obtained to RB shows the efficiency of MEM as auxiliary in the refinement of structure of hydroxylapatite by RM.en
dc.description.affiliationInstituto de Química de Araraguara UNESP Depto. de Físico-Química, Av. Gal. Carlos Cavalcanti, 4748, 84030-900 - Ponta Grossa - PR
dc.description.affiliationUniversidade Estadual de Ponta Grossa Departamento de Física CIPP, Av. Gal. Carlos Cavalcanti, 4748, 84030-900 - Ponta Grossa - PR
dc.description.affiliationUniversidade Estadual de Ponta Grossa Departamento de Química CIPP, Av. Gal. Carlos Cavalcanti, 4748, 84030-900 - Ponta Grossa - PR
dc.description.affiliationUniversidade Estadual de Ponta Grossa CIPP LIMAC, Av. Gal. Carlos Cavalcanti, 4748, 84030-900 - Ponta Grossa - PR
dc.description.affiliationUnivenidad de Barcelona Fac. Geologia Depto. Crystallografia
dc.description.affiliationUnespInstituto de Química de Araraguara UNESP Depto. de Físico-Química, Av. Gal. Carlos Cavalcanti, 4748, 84030-900 - Ponta Grossa - PR
dc.format.extent639-645
dc.identifierhttp://dx.doi.org/10.1002/9780470291191.ch97
dc.identifier.citationCeramic Engineering and Science Proceedings, v. 25, n. 4, p. 639-645, 2004.
dc.identifier.doi10.1002/9780470291191.ch97
dc.identifier.issn0196-6219
dc.identifier.scopus2-s2.0-31844450005
dc.identifier.urihttp://hdl.handle.net/11449/67956
dc.language.isoeng
dc.relation.ispartofCeramic Engineering and Science Proceedings
dc.relation.ispartofsjr0,152
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectBiomaterials
dc.subjectCarrier concentration
dc.subjectCrystals
dc.subjectEntropy
dc.subjectStoichiometry
dc.subjectSynthesis (chemical)
dc.subjectBioactive materials
dc.subjectMaximum entropy method (MEM)
dc.subjectHydroxyapatite
dc.titleSynthesis and crystal phase evaluation of hydroxylapatite using the rietveld-maximum entropy methoden
dc.typeTrabalho apresentado em evento
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

Arquivos

Coleções

Artigos - Físico Química - IQ