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Sintering behavior and electromagnetic properties of a Ni–Co ferrite/NiO biphasic ceramic

  • Amarante, Mayara dos Santos
  • Silva Júnior, Eduardo de Oliveira
  • Lima, Rodrigo Gabas Amaro de
  • Lente, Manuel Henrique
  • Machado, João Paulo Barros
  • Migliano, Antonior Carlos da Cunha
  • Brito, Vera Lúcia Othéro de
Publication Date
Jan 01, 2019
Biblioteca Digital da Memória Científica do INPE
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Tailoring of the electromagnetic properties of materials is a key issue for the development of electronics. Literature has shown that NiCo ferrites have many applications in electronic devices, such as sensors, antennas, and miniaturized devices. In this work, a biphasic ferrite-based ceramic was produced by the standard ceramic method, starting from iron, nickel, and cobalt oxides as raw materials with a (Ni + Co):Fe atomic proportion of 1.3:1.7. EDS microanalysis and x-ray diffractometry of the sintered sample revealed the presence of a major fraction of ferrite phase (estimated as Ni0.8Co0.2Fe2O4) and a NiO.CoO second phase with NiO in majority. The complex magnetic permeability of the sintered biphasic sample was evaluated in frequencies between 6 MHz 13 GHz and its complex permittivity was evaluated in frequencies between 912 GHz. Comparing to a reference NiCo ferrite sample and to data from literature, it was verified that the presence of the NiO. CoO second phase reduced the losses of the material in GHz frequencies, maintaining the typical ε′ levels of a ferrite material. The results suggest that adjustment of the oxides proportion on the formulation step of the ferrite processing is a simple an effective way of tailoring the electromagnetic properties of the ferrite. / Pages: 076110

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