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Título:
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Magnetic phase diagram of nanostructured zinc ferrite as a function of inversion degree delta
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Autores:
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Cobos Fernández, Miguel Ángel ;
Presa Muñoz del Toro, Patricia de la ;
Llorente, I. ;
Alonso Rodríguez, José María ;
Garcia Escorial, A. ;
Marín Palacios, María Pilar ;
Hernando Grande, Antonio ;
Jiménez, J. A.
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Tipo de documento:
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texto impreso
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Editorial:
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American Chemical Society, 2019-07-18
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física de materiales
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Materia = Ciencias: Física: Física del estado sólido
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Tipo = Artículo
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Resumen:
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Magnetic 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, ZnFe_2O_4 nanoparticles were synthesized by the mechanochemical reaction of stoichiometric ZnO and alpha-Fe2O3, and single-phase ZnFe_2O_4 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 ºC to control the inversion degree and, consequently, the magnetic properties. The as-milled samples, with a crystallite size of 11 nm and inversion degree delta = 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 degrees C decrease delta from 0.15 to 0.18, affecting the magnetic properties. A magnetic phase diagram as a function of delta can be inferred from the results: for delta 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.
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En línea:
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https://eprints.ucm.es/id/eprint/57231/1/DeLaPresaP%2023%20Postprint%2BEMB%2018-jul-2020.pdf
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