Abstract
YMn0.8Fe0.2O3 ceramics were annealed in oxygen and nitrogen atmosphere, respectively, and the magnetic and dielectric properties were investigated. The structures of the annealed ceramics were maintained in hexagonal P63cm space group. The magnetic structures of the annealed ceramics were not uniform, and predominantly antiferromagnetic with weak ferromagnetic properties at low temperature was detected. Cluster glass state behavior was observed in the O2-annealed ceramics and absent in the N2-annealed ceramics, which indicated the weakened ferromagnetic interaction in the latter. This was related to the decreased oxygen content in the N2-annealed ceramics. Because of the varied valence distribution of Mn and Fe ions in the ceramics annealed in different atmosphere, the dielectric properties were obviously modified. The dielectric permittivity and dielectric loss were smaller in the O2-annealed ceramics, which should be related to the lower content of Mn2+ ions in the mixed-valence structure of Mn ions. These results indicated that the magnetic and dielectric properties of YMn0.8Fe0.2O3 ceramics were strongly dependent on the oxygen vacancy content and the mixed-valence structure of magnetic ions.
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