Interface excess and polymorphic stability of nanosized zirconia-magnesia

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dc.contributor.authorCastro R.H.R.
dc.contributor.authorMarcos P.J.B.
dc.contributor.authorLorriaux A.
dc.contributor.authorSteil M.C.
dc.contributor.authorGengembre L.
dc.contributor.authorRoussel P.
dc.contributor.authorGouvea D.
dc.date.accessioned2022-01-12T22:05:00Z
dc.date.available2022-01-12T22:05:00Z
dc.date.issued2008-05-27
dc.description.abstractControlling the phase stability of ZrO2 nanoparticles is of major importance in the development of new ZrO2-based nanotechnologies. Because of the fact that in nanoparticles the surface accounts for a larger fraction of the total atoms, the relative phase stability can be controlled throughout the surface composition, which can be tuned by surface excess of one of the components of the system. The objective of this work is to delineate a relationship between surface excess (or solid solution of MgO relative to ZrO2 and the polymorphic stability of (ZrO2) 1-x-(MgO)x nanopowders, where 0.0 ≤ x ≤ 0.6. The nanopowders were prepared by a liquid precursor method at 500 °C and characterized by N2 adsorption (BET), X-ray diffraction (XRD), X-Ray photoelectron spectroscopy (XPS), and Raman spectroscopy. For pure ZrO 2 samples, both tetragonal and monoclinic polymorphs were detected, as expected considering the literature. For MgO molar fractions varying from 0.05 to 0.10, extensive solid solution could not be detected, and a ZrO 2 surface energy reduction, caused by Mg surface excess detected by XPS, promoted tetragonal polymorph thermodynamic stabilization with relation to monoclinic. For MgO molar fractions higher than 0.10 and up to 0.40, Mg solid solution could be detected and induced cubic phase stabilization. MgO periclase was observed only at x = 0.6. A discussion based on the relationship between the surface excess, surface energy, and polymorph stability is presented. © 2008 American Chemical Society.
dc.description.firstpage3505
dc.description.issuenumber10
dc.description.lastpage3511
dc.description.volume20
dc.identifier.citationCASTRO, R. H. R.; MARCOS, O. J. B.; LORRIAUS, A.; STEIL, M. C.; GENGEMBRE, L.; ROUSSEL, P.; GOUVEA, D. Interface excess and polymorphic stability of nanosized zirconia-magnesia. Chemistry of Materials, v. 20, n. 10, p. 3505-3511, Mayo, 2008.
dc.identifier.doi10.1021/cm703599r
dc.identifier.issn0897-4756
dc.identifier.urihttps://repositorio.fei.edu.br/handle/FEI/4309
dc.relation.ispartofChemistry of Materials
dc.rightsAcesso Restrito
dc.titleInterface excess and polymorphic stability of nanosized zirconia-magnesia
dc.typeArtigo
fei.scopus.citations28
fei.scopus.eid2-s2.0-45749144719
fei.scopus.subjectNano-sized
fei.scopus.updated2024-07-01
fei.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=45749144719&origin=inward
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