The Role Of Oxygen Vacancies And Their Location In The Magnetic Properties Of Ce1-xcuxo2-δ Nanorods

dc.creatorBernardi M.I.B.
dc.creatorMesquita A.
dc.creatorBeron F.
dc.creatorPirota K.R.
dc.creatorDe Zevallos A.O.
dc.creatorDoriguetto A.C.
dc.creatorDe Carvalho H.B.
dc.date2015
dc.date2015-06-25T12:53:10Z
dc.date2015-11-26T15:07:07Z
dc.date2015-06-25T12:53:10Z
dc.date2015-11-26T15:07:07Z
dc.date.accessioned2018-03-28T22:17:33Z
dc.date.available2018-03-28T22:17:33Z
dc.identifier
dc.identifierPhysical Chemistry Chemical Physics. Royal Society Of Chemistry, v. 17, n. 5, p. 3072 - 3080, 2015.
dc.identifier14639076
dc.identifier10.1039/c4cp04879b
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84921668391&partnerID=40&md5=c232aa6d2a6e3b8c32ef839b6668dbaf
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/85435
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/85435
dc.identifier2-s2.0-84921668391
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1257387
dc.descriptionCeria (CeO2) is a promising dilute magnetic semiconductor. Several studies report that the intrinsic and extrinsic structural defects are responsible for room temperature ferromagnetism in undoped and transition metal doped CeO2 nanostructures; however, the nature of the kind of defect necessary to promote and stabilize the ferromagnetism in such a system is still a matter of debate. In the work presented here, nanorods from the system Ce1-xCuxO2-δ with x = 0, 0.01, 0.03, 0.05 and 0.10, with the more stable {111} surface exposed were synthesized by a microwave-assisted hydrothermal method. A very careful structure characterization confirms that the Cu in the samples assumes a majority 2+ oxidation state, occupying the Ce (Ce4+ and Ce3+) sites with no secondary phases up to x = 0.05. The inclusion of the Cu2+ in the CeO2 structure leads to the introduction of oxygen vacancies in a density proportional to the Cu2+ content. It is supposed that the spatial distribution of the oxygen vacancies follows the Cu2+ distribution by means of the formation of a defect complex consisting of Cu2+ ion and an oxygen vacancy. Superconducting quantum interference device magnetometry demonstrated a diamagnetic behavior for the undoped sample and a typical paramagnetic Curie-Weiss behavior with antiferromagnetic interactions between the Cu2+ ions for the single phase doped samples. We suggest that the presence of oxygen vacancies is not a sufficient condition to mediate ferromagnetism in the CeO2 system, and only oxygen vacancies in the surface of nanostructures would lead to such a long range magnetic order.
dc.description17
dc.description5
dc.description3072
dc.description3080
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dc.languageen
dc.publisherRoyal Society of Chemistry
dc.relationPhysical Chemistry Chemical Physics
dc.rightsaberto
dc.sourceScopus
dc.titleThe Role Of Oxygen Vacancies And Their Location In The Magnetic Properties Of Ce1-xcuxo2-δ Nanorods
dc.typeArtículos de revistas


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