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dc.creatorTadić, Marin
dc.creatorMilošević, Irena
dc.creatorKralj, Slavko
dc.creatorHanžel, Darko
dc.creatorBarudžija, Tanja
dc.creatorMotte, Laurence
dc.creatorMakovec, Darko
dc.date.accessioned2020-09-30T12:26:29Z
dc.date.available2020-09-30T12:26:29Z
dc.date.issued2020
dc.identifier.issn1359-6454
dc.identifier.urihttps://vinar.vin.bg.ac.rs/handle/123456789/8824
dc.description.abstractA metastable ε-polymorph of iron(III) oxide (ε-Fe2O3) is a very attractive material from the technological, engineering, and scientific points of view. In comparison with other iron oxides, it is characterized by unusual magnetic properties and a giant coercivity of ~20 kOe, which is the largest value among metal oxides. The routine method of ε-Fe2O3 formation is based on the thermal annealing of maghemite (γ-Fe2O3) nanoparticles confined in a silica matrix where the ε-Fe2O3 appears as an intermediate phase between the maghemite and an α-polymorph (α-Fe2O3) hematite (γ→ε→α pathway). In this study, it is demonstrated that the ε→α transformation can be reversed when hematite nanoparticles with an anisotropic hollow morphology are annealed above 600 °C. The observed reversal of the phase stability is explained in terms of an increased nanoparticle surface area and surface energy related to the hollow structure. This study demonstrates the applicability of surface-induced phase transformation to stabilize and control ε-Fe2O3 nanostructures with anisotropic shape and high coercivity ~1600 kA/m that is one of the key properties of functional magnetic materials for information processing and storage. The understanding of ε-Fe2O3 formation mechanism can provide a new viewpoint and guidance for designing metastable polymorphs and applicative properties. © 2020 Acta Materialia Inc.en
dc.language.isoen
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45015/RS//
dc.relationProject CNRS-MSTD [25793]
dc.relationBilateral Project [Bi-RS/1415-24]
dc.relationSlovenian Research Agency - Slovenia [P2-0089]
dc.relationSlovenian Research Agency - Slovenia [P1-0112]
dc.relationSlovenian Research Agency - Slovenia [J17302]
dc.relationSlovenian Research Agency - Slovenia [J3-7494]
dc.rightsrestrictedAccess
dc.sourceActa Materialia
dc.subjectNanostructureen
dc.subjectTransformationen
dc.subjectOxideen
dc.subjectMagnetic propertiesen
dc.subjectTransmission electron microscopyen
dc.titleSurface-induced reversal of a phase transformation for the synthesis of ε-Fe2O3 nanoparticles with high coercivityen
dc.typearticleen
dc.rights.licenseARR
dcterms.abstractМотте, Лауренце; Тадић, Марин; Краљ, Славко; Ханзел, Дарко; Баруджија, Тања; Маковец, Дарко; Милошевић, Ирена;
dc.rights.holder© 2020 Acta Materialia Inc.
dc.citation.volume188
dc.citation.spage16
dc.citation.epage22
dc.identifier.wos000527826500002
dc.identifier.doi10.1016/j.actamat.2020.01.058
dc.citation.rankaM21~
dc.type.versionpublishedVersion
dc.identifier.scopus2-s2.0-85079280935


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