Structural and Magnetic Properties of Dilute Magnetic Oxide Based on Nanostructured Co-Doped Anatase TiO2 (Ti1-xCoxO2-delta)

dc.creatorde Souza, TE
dc.creatorMesquita, A
dc.creatorde Zevallos, AO
dc.creatorBeron, F
dc.creatorPirota, KR
dc.creatorNeves, PP
dc.creatorDoriguetto, AC
dc.creatorde Carvalho, HB
dc.date2013
dc.date46539
dc.date2014-08-01T18:29:27Z
dc.date2015-11-26T17:07:45Z
dc.date2014-08-01T18:29:27Z
dc.date2015-11-26T17:07:45Z
dc.date.accessioned2018-03-28T23:56:17Z
dc.date.available2018-03-28T23:56:17Z
dc.identifierJournal Of Physical Chemistry C. Amer Chemical Soc, v. 117, n. 25, n. 13252, n. 13260, 2013.
dc.identifier1932-7447
dc.identifierWOS:000321236400040
dc.identifier10.1021/jp4017129
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/79659
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/79659
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1280196
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionNanostructured Co-doped anatase TiO2 (Ti1-xCoxO2-delta) samples were prepared and studied with particular emphasis on their compositional, structural, and magnetic properties. A detailed microstructural analysis was carried out to investigate the nature of the Co incorporation into the anatase TiO2 matrix. By combining different techniques, we confirmed the replacement of Ti4+ by Co2+ ions in the anatase TiO2 structure. Neither segregated secondary phases nor Co-rich nanocrystals were detected. Co doping was found to introduce oxygen vacancies into the system by means of a charge-compensation process. Superconducting quantum interference device magnetometry demonstrated paramagnetic Curie-Weiss behavior with antiferromagnetic interactions even in the presence of a high density of oxygen vacancies. The fitting of the M(H) curves in the limits of low and high temperatures enable the fractions of isolated and antiferromagnetically coupled Co ions to be extracted. We discuss the observed magnetic behavior of our samples considering the current main theories for the magnetic properties of dilute magnetic oxides.
dc.description117
dc.description25
dc.description13252
dc.description13260
dc.descriptionFundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionFINEP [134/08]
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFAPEMIG [APQ-02600-12, PPM-00524-12]
dc.descriptionCNPq [306867/2009-5, 476870/2011-9]
dc.descriptionCAPES [PNPD-2007, PNPD-2011]
dc.descriptionFINEP [134/08]
dc.languageen
dc.publisherAmer Chemical Soc
dc.publisherWashington
dc.publisherEUA
dc.relationJournal Of Physical Chemistry C
dc.relationJ. Phys. Chem. C
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectTitanium-dioxide
dc.subjectRoom-temperature
dc.subjectOxygen Vacancy
dc.subjectFerromagnetism
dc.subjectSusceptibility
dc.subjectNanoparticles
dc.titleStructural and Magnetic Properties of Dilute Magnetic Oxide Based on Nanostructured Co-Doped Anatase TiO2 (Ti1-xCoxO2-delta)
dc.typeArtículos de revistas


Este ítem pertenece a la siguiente institución