Abstract
Remarkable electrical properties in the hard magnetic materials M hexaferrites have been reported in recent years. To evidence these properties, synthesis processes involving heat treatments at high temperatures (1300 °C) in an oxygen atmosphere have usually been necessary. In this work, using the chemical coprecipitation route, SrFe12O19 hexaferrite powders were synthesized with different Sr/Fe stoichiometric ratios (1/12, 1/11, 1/10.8). These powders were thermally treated between 830 and 1005 °C in air. In correspondence with the nanometric particle sizes of the synthesized powders, high values of saturation magnetization, Ms (~ 72 emu g−1), and a maximum coercive field, iHc of 5.9 kOe, were obtained for SrM 1/10.8. The samples with a ratio of 1/10.8 treated at 1005 °C for 2 h in air did not reveal spurious phases, so electrical loops at low fields were performed, which showed an incipient electrical ordering. To favor this aspect, the powders were reheated at 1100 °C for 2 h in air. The polarization vs electrical field curves showed remanent polarization and coercivity values comparable to those previously reported for heat treatments at more elevated temperatures in the presence of oxygen.
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Acknowledgements
The authors would like to acknowledge the support of the National Laboratory for Nanotechnology Research (LINAN-IPICYT) for the VSM, X-ray diffraction and Scanning Electron Microscopy measurements. In particular, to Dr. Gladis Labrada and the M.Sc. Beatriz Rivera for his technical assistance. The evaluation of electrical hysteresis was carried out thanks to the CONACYT research project INFRA-2017-01-282193.
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Santos-López, F.J., Díaz-Castañón, S. Magnetic Properties and Electric Hysteresis in SrFe12O19 Hexaferrites at Low Sintered Temperatures. J Supercond Nov Magn (2024). https://doi.org/10.1007/s10948-024-06724-7
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DOI: https://doi.org/10.1007/s10948-024-06724-7