Influence of microstructure on properties of Ni–Zn ferrite radio-absorbing materials

• Published in: Journal of magnetism and magnetic materials Vol. 394; pp. 1 - 6
• Main Authors: Andreev, V.G., Menshova, S.B., Klimov, A.N., Vergazov, R.M., Bibikov, S.B., Prokofiev, M.V.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.11.2015
• Subjects: Alloying additions; Average size of a grain; Boundaries; Ceramics; Coarsening; Ferrite; Ferrite radio-absorbing materials; Magnetic materials; Magnetism; Microstructure; Nickel; Radiophysical characteristics; Average size of a grain; Alloying additions; Ferrite radio-absorbing materials; Microstructure; Radiophysical characteristics
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2015.06.007

In this work there have been carried out studies in the radiophysical characteristics of the samples of Ni–Zn ferrite radio-absorbing materials, obtained by the ceramic method under different technological conditions. There has been established the influence of microstructure on the electromagnetic losses of Ni–Zn ferrite radio-absorbing materials. The results indicate that the coarse-grained structure leads to an increase of radio-absorbing capacity at frequencies below 30MHz. It can be explained by the resonance of domain boundaries. •Addition of Bi2O3 up to 1 mass% leads to increasing grain sizes of Ni-Zn ferrites.•Coarse-grained structure is achieved adding ferrite particles of a large fraction.•Coarse-grained structure leads to increasing absorbing capacity at low frequencies.•It can be explained by the resonance of domain boundaries.