Origin of Elevated Ordering Temperature in MnFe2O4 Nanometer Particles
نویسندگان
چکیده
Mossbauer spectra of MnFez04 with various particle sizes in a longitudinal 50 kOe magnetic field show that the Fe ion occupancy of the A and B crystallographic sites depends on the particle size. The elevated N6el temperatures with decreasing particle sizes are attributed to an increased iron occupancy on the A sites; this in turn leads to an increase in the total superexchange interaction.
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تاریخ انتشار 2017