Abstract
Magnetic nanoparticles were prepared by a wet chemical method. Precursors of MFe2O4 (M = Co, Mn, Zn) were prepared from a mixture of metal chloride and metasilicate nonahydrate aqueous solutions. The precipitates obtained in the wet chemical method were calcined to obtain MFe2O4 nanoparticles encapsulated by amorphous SiO2. The blocking temperatures T B’s were between 20 and 320 K, in this temperature range, the anisotropy energy of the particles decreased below their thermal energy. T B increased with the particle size. In order to clarify the nanoparticle formation process, differential thermal analysis and thermogravimetric (TG-DTA) measurements were performed for the as-prepared samples.
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Acknowledgements
This study was partially supported by Precursory Research for Embryonic Science and Technology of the Japan Science and Technology Agency, and a Promotion of Science Grant-in Aid for Scientific Research (No. 1851009100). I would like to thank Prof. T. Atake and Prof. H. Kawaji at the Tokyo Institute of Technology for the TG-DTA measurement and useful discussions.
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Ichiyanagi, Y., Moro, Y., Katayanagi, H. et al. Magnetic and thermal analysis of MFe2O4 (M = Co, Mn, Zn) nanoparticles. J Therm Anal Calorim 99, 83–86 (2010). https://doi.org/10.1007/s10973-009-0564-8
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DOI: https://doi.org/10.1007/s10973-009-0564-8