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Microwave behaviour of ferrite composites

D. LISJAK1,* , V. B. BREGAR1,2, A. ZNIDARSIC2, M. DROFENIK1

Affiliation

  1. Jozef Stefan Institute, Advanced Materials Dep., Jamova 39, SI-1000 Ljubljana, Slovenia
  2. Iskra Feriti d.o.o., a member of Kolektor group, Stegne 29, 1000 Ljubljana, Slovenia

Abstract

Three types of ceramic composites were prepared using solid-state reaction at 1000-1300°C: spinel/M-hexaferrite (SM), Z-hexaferrite/U-hexaferrite (ZU) and Z-hexaferrite/W-hexaferrite (ZW). The evolution of phases was studied with X-ray powder diffraction and the microstructures of the composites were examined with electron microscopy. Their microwave behaviour was studied with respect to their composition and microstructure. The permeabilities of composites were strongly influenced by the permeabilities of the constituent phases and their porosity. This was quantified using the effective-medium theory (EMT). The permeabilites that were calculated with EMT from permeabilities of single-phase samples were matched with measured effective permeability of composite samples. On the contrary, the initial permeability of W-hexaferrite was calculated from the permeability values obtained from the ZW composite. It is shown that EMT can be used for the quantitative characterization of permeability in ferrite composites..

Keywords

Microwave, Ferrite, Ceramic, Composite.

Submitted at: Oct. 14, 2005
Accepted at: Jan. 26, 2006

Citation

D. LISJAK, V. B. BREGAR, A. ZNIDARSIC, M. DROFENIK, Microwave behaviour of ferrite composites, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 1, pp. 60-65 (2006)