Preparation and microwave absorption properties of barium ferrite nanorods

Frequency and Temperature Dependent Dielectric Response of Fe₃O₄ Nano-crytallites

“…Due to this polarization, the dielectric constant is higher at low frequencies. The same behavior has also been reported in literature [19,21]. In addition, it has intensively been investigated that the dielectric properties of ferrites are dependent upon several other factors, including the method of preparation, chemical composition, grain structure and grain size of the ferrite nanoparticles [13].…”

A microwave absorber based on strontium ferrite–carbon black–nitrile rubber for S and X-band applications

“…Spinel ferrites do not perform well in the Giga Hertz range of spectrum due to a drop in the complex permeability as given by Snoek's limit [7][8][9]. Compared to spinel and garnets, hexagonal ferrites in the pristine form have been found to be good microwave absorbers in the frequency range of 1-100 GHz because of their high saturation magnetization, coercivity, chemical stability, corrosion resistance and adjustable anisotropy through appropriate ion substitution [9].…”

“…Compared to spinel and garnets, hexagonal ferrites in the pristine form have been found to be good microwave absorbers in the frequency range of 1-100 GHz because of their high saturation magnetization, coercivity, chemical stability, corrosion resistance and adjustable anisotropy through appropriate ion substitution [9]. Hence incorporation of M-type strontium hexaferrite (SrF) in the rubber matrix enhances the magnetic permeability of the composite and in turn modifies the microwave absorption properties.…”

Investigation of magnetic, dielectric and electrical properties of Ba-hexaferrites

“…The 256 electronic conduction in ferrites occur basically due to the 257 hopping of electrons between the ions of the same element 258 existing in more than one valence state which are distrib-259 uted randomly over the crystallographically equivalent 260 lattice sites. Polycrystalline ferrites are considered to have 261 two layers-first one being a heterogeneous medium of 262 conducting layer with a large number of grains and the 263 other one is a highly resistive thin layer with grain 264 boundaries [46,47]. The interfacial dielectric polarization 265 arises from defects in grain boundaries, oxygen vacancies, 266 dislocations and other defects that causes to an enhance-267 ment of dielectric constant at lower frequencies [48].…”