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Magnetic properties of Cr-substituted ε-(Fe1-xCrx)2O3 nanoparticles with epsilon structure

AuthorsMa, Zheng; Romaguera, Arnau; Fauth, François; Herrero Martín, Javier CSIC ORCID; García Muñoz, Josep Lluís; Gich, Martí CSIC ORCID
KeywordsNormal distributions
Issue Date15-Jul-2020
CitationJournal of Magnetism and Magnetic Materials 506: 166764 (2020)
Abstractε-Fe2O3 has gained considerable interest due to its intriguing properties and great application potentials. In this work ε-(Fe1−xCrx)2O3 (x = 0, 0.03, 0.075) nanoparticles encapsulated in silica have been successfully prepared by sol–gel chemistry. Synchrotron diffraction confirms that the polar Pna21 structure of ε-Fe2O3 is robust against the substitution of Fe by Cr. The incorporation of chromium is accompanied by a softer magnetic behaviour, and also a gradual decrease in the ferromagnetic signal associated to the super-hard FM2 ferrimagnetic phase. While the Cr substitution has little impact on the low temperature incommensurate transition, it is found that Cr substitution shifts the super-hard and soft ferrimagnetic transitions (respectively, TN2 and TN1) to notably lower temperatures.
Publisher version (URL)http://dx.doi.org/10.1016/j.jmmm.2020.166764
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