Abstract
Nanocrystalline magnesium doped ferrites with grain sizes between 50 and 11 nm were prepared by the ball milling. Magnetization of the non-milled ferrite diminishes monotonically with temperature and vanishes above the relatively high Curie temperature T C of 900 K. A milling process suppresses T C down to 830 K, which reveals the exchange interaction diminishing with the reduced grain sizes. The room temperature magnetic moment per formula unit diminishes from 2.15 μ B for non-milled ferrite to 1.27 μ B for 11 nm sample. The hyperfine magnetic fields derived from Mössbauer spectra are remarkably suppressed when the grain sizes are reduced below 20 nm.
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Pękała, M., Berry, F.J. & Widatallah, H.M. Magnetic study of nanocrystalline Mg-doped lithium ferrite. Czech J Phys 52 (Suppl 1), A101–A104 (2002). https://doi.org/10.1007/s10582-002-0023-2
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DOI: https://doi.org/10.1007/s10582-002-0023-2