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Magnetic Phase Diagram of Nanostructured Zinc Ferrite as a Function of Inversion Degree δ

AuthorsCobos, M. A.; De La Presa, P.; Llorente, Irene CSIC ORCID ; Alonso, J. M.; García Escorial, Asunción CSIC ORCID; Marín, P.; Hernando, A.; Jiménez, José Antonio CSIC ORCID CVN
Issue Date2019
PublisherACS Publications
CitationJournal of Physical Chemistry C 123: 17472-17482 (2019)
AbstractMagnetic properties of spinel zinc ferrites are strongly linked to the synthesis method and the processing route since they control the microstructure of the resulting material. In this work, ZnFeO nanoparticles were synthesized by the mechanochemical reaction of stoichiometric ZnO and α-FeO, and single-phase ZnFeO was obtained after 150 h of milling. The as-milled samples, with a high inversion degree, were subjected to different thermal annealings up to 600 °C to control the inversion degree and, consequently, the magnetic properties. The as-milled samples, with a crystallite size of 11 nm and inversion degree δ= 0.57, showed ferrimagnetic behavior even above room temperature, as shown by Rietveld refinements of the X-ray diffraction pattern and superconducting quantum interference device magnetometry. The successive thermal treatments at 300, 400, 500, and 600 °C decrease δfrom 0.57 to 0.18, affecting the magnetic properties. A magnetic phase diagram as a function of δcan be inferred from the results: For δ< 0.25, antiferromagnetism, ferrimagnetism, and spin frustration were observed to coexist; for 0.25 < δ< 0.5, the ferrimagnetic clusters coalesced and spin glass behavior vanished, with only a pure ferrimagnetic phase with a maximum magnetization of M = 3.5μ remaining. Finally, for δ> 0.5, a new antiferromagnetic order appeared due to the overpopulation of nonmagnetic Zn on octahedral sites that leads to equally distributed magnetic cations in octahedral and tetrahedral sites.
Publisher version (URL)https://doi.org/10.1021/acs.jpcc.9b02180
Identifiersdoi: 10.1021/acs.jpcc.9b02180
issn: 1932-7455
Appears in Collections:(CENIM) Artículos
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