Mechanical, Magnetic, and Microstructural Characterization of Ni0.9Co0.1Fe2O4 Produced by the Ceramic Method

• Published in: Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2018-01, Vol.21 (3)
• Main Authors: Hieda, Mônica Sumie, Machado, João Paulo Barros, Silva Júnior, Eduardo de Oliveira, Dias, Mateus Botani de Souza, Nunes, Cristina Bormio, Lima, Rodrigo Gabas Amaro de, Migliano, Antonio Carlos da Cunha, Brito, Vera Lúcia Othéro de
• Format: Article
• Language: English
• Subjects: complex magnetic permeability; ENGINEERING, CHEMICAL; ferrites; flexural strength; magnetic ceramics; magnetostriction; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING
• ISSN: 1516-1439; 1980-5373; 1980-5373
• DOI: 10.1590/1980-5373-mr-2017-0694

Ni-Co ferrites, especially the ones with lower cobalt fractions, are candidate materials for applications in magnetomechanical sensors and electromagnetic wave absorbers. This work studied the microstructure, magnetostriction, flexural strength, and complex magnetic permeability of Ni0.9Co0.1Fe2O4, presenting data that weren't covered by previous literature on this composition. It was found that sieving the calcined powder before the forming operation increased the flexural strength of the ceramic. The Ni-Co ferrite had a saturation magnetostriction of 36ppm. The real part of the complex magnetic permeability varied between 2.2-2.3 in frequencies from 100MHz to 1GHz. In frequencies higher than 1GHz, µ' decreased sharply and reached 1 at 3.9GHz. It was found that the grinding media provided a small fraction of Al to the ferrite composition, which apparently affected the complex magnetic permeability of the material but the magnetostriction results were very close to Al-free Ni-Co ferrites with similar composition.